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Introductory

SPECIES: Alnus viridis ssp. sinuata | Sitka Alder
ABBREVIATION : ALNVIRS SYNONYMS : Alnus sinuata Alnus viridis var. sinuata Alnus crispa ssp. sinuata Alnus sitchensis Alnus alnobetula SCS PLANT CODE : ALSI3 COMMON NAMES : Sitka alder mountain alder wavyleaf alder green alder TAXONOMY : Sitka alder is described under a variety of scientific names by numerous authors. The most commonly used scientific name, which designates Sitka alder as a distinct species, is Alnus sinuata (Reg.) Rydberg [25,27,29,35]. However, more recent studies have shown Sitka alder to be a member of a circumpolar taxon distributed across America, Europe, and Asia [18]. This taxon has been separated into the following two subspecies [18,20,30]: Alnus viridis ssp. crispa (Aiton) Turill - green alder - northern North America, including northwestern N. America Alnus viridis ssp. sinuata (Regel) Love & Love - Sitka alder - northwestern North America Intermediate forms between these subspecies are found where their ranges overlap [5,18]. The following information is for the entity Alnus viridis ssp. sinuata (Regel) Love & Love. LIFE FORM : Tree FEDERAL LEGAL STATUS : No special status OTHER STATUS : NO-ENTRY COMPILED BY AND DATE : Ronald Uchytil, June 1989 LAST REVISED BY AND DATE : NO-ENTRY AUTHORSHIP AND CITATION : Uchytil, Ronald J. 1989. Alnus viridis ssp. sinuata. In: Remainder of Citation

DISTRIBUTION AND OCCURRENCE

SPECIES: Alnus viridis ssp. sinuata | Sitka Alder
GENERAL DISTRIBUTION : Sitka alder is distributed from central Alaska and the Yukon Territory south throughout British Columbia and western Alberta, and from Washington to northwestern California, east to Idaho and central Montana [27,29,35]. ECOSYSTEMS : FRES20 Douglas-fir FRES22 Western white pine FRES23 Fir - spruce FRES24 Hemlock - Sitka spruce FRES26 Lodgepole pine STATES : AK CA ID MT OR WA WY AB BC YT ADMINISTRATIVE UNITS : CODA CRLA DENA GLBA GLAC LACL MORA NOCA OLYM WRST YELL BLM PHYSIOGRAPHIC REGIONS : 1 Northern Pacific Border 2 Cascade Mountains 4 Sierra Mountains 8 Northern Rocky Mountains 9 Middle Rocky Mountains KUCHLER PLANT ASSOCIATIONS : K001 Spruce - cedar - hemlock K002 Cedar - hemlock - Douglas-fir forest K003 Silver fir - Douglas-fir forest K004 Fir - hemlock forest K007 Red fir forest K012 Douglas-fir forest K013 Cedar - hemlock - pine forest K014 Grand fir - Douglas-fir forest K015 Western spruce - fir forest SAF COVER TYPES : 201 White spruce 203 Balsam poplar 205 Mountain hemlock 206 Englemann spruce - subalpine fir 207 Red fir 210 Interior Douglas-fir 213 Grand fir 218 Lodgepole pine 223 Sitka spruce 224 Western hemlock 225 Western hemlock - Sitka spruce 226 Coastal true fir - hemlock 227 Western redcedar - western hemlock 228 Western redcedar 229 Pacific Douglas-fir 230 Douglas-fir - western hemlock 251 White spruce - aspen SRM (RANGELAND) COVER TYPES : NO-ENTRY HABITAT TYPES AND PLANT COMMUNITIES : Sitka alder is a seral shrub or small tree typically found on moist cool sites within western redcedar (Thuja plicata), western hemlock (Tsuga heterophylla), subalpine fir (Abies lasiocarpa), or Pacific silver fir (A. amabilis) forests in the Cascades and Rocky Mountains [1,17,29,40,46]. Published classification schemes listing Sitka alder as an indicator species or as a dominant part of the vegetation in community types (cts) or habitat types (hts) are presented below: Area Classification Authority OR,WA general veg. cts Franklin & Dyrness 1973 OR:Eagle Cap general veg. cts Cole 1982 Wilderness OR:Monument Peak general veg. cts Aller 1965 wcID general veg. cts Curtis 1986 eWA,nID forest hts Daubenmire & Daubenmire 1968 ID forest hts Cooper & others 1987 cID grand fir/blue hkbry hts Steele & Geier-Hayes 1987 cID forest hts Steele & others 1981 MT forest hts Pfister & others 1977

VALUE AND USE

SPECIES: Alnus viridis ssp. sinuata | Sitka Alder
WOOD PRODUCTS VALUE : Sitka alder is occasionally used for firewood [27]. IMPORTANCE TO LIVESTOCK AND WILDLIFE : Sitka alder has little forage value for big game animals or livestock [20,46]. Plants are occasionally eaten by mule deer [33]. Dense stands impede the movements of livestock [11] but provide cover for wildlife [36]. Sitka alder-dominated avalanche chutes are considered excellent habitat for grizzly bears. Grizzly bears often forage in these areas, eating mesic herbaceous plants as they green up in the spring and berries from shrubs in the summer and fall [51]. Muskrats, beavers, cottontails, and snowshoe hares eat alder (Alnus spp.) twigs and leaves [24]. Beavers eat the bark of alders, and build dams and lodges with the stems [49]. Alder seeds, buds, and catkins, are eaten by redpolls, siskins, goldfinches, chickadees, and grouse, and are an important winter food source [24,36]. PALATABILITY : The palatability of Sitka alder to big game animals and livestock is generally poor [11,20]. NUTRITIONAL VALUE : NO-ENTRY COVER VALUE : Often forming dense thickets, Sitka alder provides thermal and hiding cover for many wildlife species, and is especially valuable as hiding cover for big game animals [7]. Thickets also provide nesting and foraging habitat for many bird species [24]. Thickets in Idaho often have high population densities of pocket gophers and hares [7]. VALUE FOR REHABILITATION OF DISTURBED SITES : Sitka alder is valuable for slope stabilization and erosion control on steep slopes [20]. Its seeds are adapted to invade bare mineral soil and can be sown onti cool, moist, disturbed sites. To obtain seed, proven cone collection and seed extraction procedures should be followed [24]. Transplanting seedlings is most successful when 2- and 3-year-old container-grown stock is used [24]. Red alder is suitable for revegetating sterile soils because it fixes atmospheric nitrogen. An Alaska study found that Sitka alder seedlings originating from windblown seed of nearby plants quickly invaded coal mine spoils [14], indicating its potential usefulness for revegatating such areas. OTHER USES AND VALUES : The bark and foliage of alders is very astringent and was used by Native Americans for medicinal purposes. Preparations from alder bark were also used by Native Americans to tan and dye leather and textiles [18]. MANAGEMENT CONSIDERATIONS : Nurse crop: Sitka alder improves soil fertility both by fixing nitrogen and by producing a nitrogen-rich leaf litter [20]. It has therefore been proposed for interplanting with Douglas-fir or other desirable conifers on sites where additional nitrogen is desirable [22]. Based on juvenile height-growth patterns, Douglas-fir should be planted 2 to 6 years before Sitka alder to ensure that it is not overtopped and suppressed. Competition: Attempts to establish conifers on Sitka alder sites have generally proved unsuccessful. It can be a major competitor with planted conifer seedlings, especially if it was established in the understory prior to harvest [20]. On good sites, Sitka alder-dominated brushfields may develop following wildfire or logging [40]. When established in the understory or where "conifer islands" occurring within Sitka alder communities have been removed, sites should receive immediate conifer regeneration treatment [7]. Moisture relationships: Sitka alder is indicative of high water tables. Stands may therefore make access for timber harvest difficult [46], but may prove useful for hikers searching for water. Trails should cross avalanche chutes at right angles to prevent water from being diverted downhill [6].

BOTANICAL AND ECOLOGICAL CHARACTERISTICS

SPECIES: Alnus viridis ssp. sinuata | Sitka Alder
GENERAL BOTANICAL CHARACTERISTICS : Sitka alder is a deciduous shrub or, rarely, a small tree. Plants are typically multistemmed and bushy, up to 10 or 15 feet (3 or 4.6 m) tall, often forming dense thickets [3,39]. Occasionally, plants may grow to 30 or 40 feet (9 or 12 m) at lower elevations [3,27]. Height growth generally decreases with increasing elevation [22]. The resilient branches are seldom damaged by snow creep or avalanches, allowing dense thickets to form on steep slopes subject to these disturbances [17]. On these sites the 3 to 6 inch (7.6-15.2 cm) diameter stems often point downhill and then bow strongly upwards [17,20,38]. The bark is thin, smooth, and reddish brown or gray [25,39]. The leaves are alternate, ovate, 0.8 to 2.5 inches (3-10 cm) long, shiny green, with doubly serrate margins [39]. Sitka alder has a shallow root system [27]. Male and female flowers occur on the same plant in catkins. The separate male and female catkins are in small clusters on the same twig [20]. Clusters of three to six pistillate catkins are approximately 0.5 inch (1.25 cm) long, each with a long, 1 to 1.5 inch (2.5-3.75 cm) stalk [25,27]. RAUNKIAER LIFE FORM : Undisturbed State: Phanerophyte (microphanerophyte) Undisturbed State: Phanerophyte (nanophanerophyte) Burned or Clipped State: Hemicryptophyte REGENERATION PROCESSES : Sexual reproduction: Male and female flowers of Sitka alder occur in catkins on the same plant. The small (about 0.5 inch [1.25 cm] long) female catkins are wind pollinated, and turn semiwoody and conelike at maturity. The fruit is a small, single-seeded nutlet with wide lateral wings. Seeds are dispersed during the fall [20]. Sitka alder's seeds are lightweight and have broad wings about as wide as the body of the nut, which allows them to travel long distances by wind and water [44]. Germination from seed on disturbed habitats is the primary form of reproduction of Sitka alder [20]. The wind-dispersed seeds colonize bare soil created by disturbances such as fire, avalanches, soil slump, and retreating glaciers. Seeds require a moist mineral soil for germination, which normally takes place in the spring. Studies in western Washington found that it takes 3 to 4 years for Sitka alder seedlings to reach 3 feet (1 m) in height, and 10 years to reach 13 feet (4 m) [22]. Seedlings take 4 to 7 years to start producing seed [28,34]. Vegetative Reproduction: Sitka alder plants can sprout from the root collar or stump when damaged. Although alder wood is resilient and somewhat limber, avalanches can damage plants, which afterwards often sprout [38]. Sprouting also often occurs from root crowns following fire [47]. Propagation: Stem cuttings of Sitka alder seldom, if ever, produce roots [26]. SITE CHARACTERISTICS : Sitka alder is generally found at middle to high elevations in the mountains of northwestern North America. It is moderately shade tolerant [20,31], which allows it to survive under stands of lodgepole pine (Pinus contorta), Engleman spruce (Picea engelmannii), subalpine fir, grand fir (Abies grandis), western hemlock, mountain hemlock (Tsuga mertensiana), Douglas-fir, and Pacific silver fir [1,7,40,46]; however, it cannot tolerate a dense overstory. Scattered thickets of Sitka alder are normally located on cool moist sites, on north-facing slopes, or other shady aspects [3,37,40,46]. It is a vigorous invader of talus slopes, avalanche chutes, seepage areas, and high elevation mountain swales, which often have an abundance of surface moisture [29,43]. These sites are often subject to deep winter snow accumulations and recurrent avalanches. Although typically mentioned as a seral shrub of cool, moist, shady upland sites, it also occurs along cool mountain streams in Oregon and Washington [23,29]. Soils: Sitka alder is found on a wide variety of parent materials and soil textures [20]. Surface soil textures vary from silts to coarse sands, and are consistently more acidic than those in adjacent conifer communities [7,40]. Soils under Sitka alder are normally higher in available nitrogen than soils in adjacent communities, since this species can fix between 18 to 55 pounds per acre (20-62 kg/ha) of nitrogen annually [20]. Its ability to fix nitrogen allows it to invade sterile mineral soil recently exposed by glaciers or avalanches [20]. Associated species: Sitka alder is commonly found with shrubs such as Rocky Mountain maple (Acer glabrum), vine maple (A. circinatum), elderberies (Sambucus spp.), willows (Salix spp.), prickly currant (Ribes lacustre), mountain ash (Sorbus spp.), rusty leaf menziesia (Menziesia ferruginea). Commonly associated herbs and forbs (usually shade tolerant) include heartleaf miners lettuce (Montia cordifolia), Siberian miners lettuce (M. sibirica), arrowleaf groundsel (Senecio triangularis), wild ginger (Asarum caudatum), lady fern (Athyrium felix-femina), queencup beadlily (Clintonia unifloria), broadleaf arnica (Arnica latifolia), sidebells shinleaf (Pyrola secunda), pioneer violet (Viola glabella), nettles (Urtica dioica), northern bluebells (Mertensia paniculata), and bracken fern (Pteridium aquilinum) [2,6,7,9,40]. Elevation: Sitka alder is mostly distributed above 3,000 feet (914 m) [3]. Sitka alder does not grow below 1,640 feet (500 m) in Washington [22]. Elevational ranges for the following western states are presented below [6,12]: from 3,500 to 8,000 feet (1,067-2,438 m) in MT 5,700 to 7,000 feet (1,737-2,134 m) in Eagle Cap Wilderness, OR SUCCESSIONAL STATUS : Sitka alder is generally considered a pioneer or early seral species, capable of colonizing disturbed or sterile soils and often appears on avalanche chutes, talus slopes, fresh alluvium, and at the head of retreating glaciers [20,34,38]. On steep terrain in heavy snowpack areas, recurrent avalanches are partially responsible for the creation and maintenance of Sitka alder communities [17]. The soils exposed by avalanches provide an ideal seedbed for Sitka alder seeds. Once established, its resilient wood, bowed growth form, and ability to resprout if stems are broken allow Sitka alder to withstand repeated avalanche destruction, which would normally kill other plants. Other Sitka alder communities appear to be stable and long-lived and are apparently midseral or even climax. When conifers are removed by disturbances such as wildfire, avalanche, or massive soil slumping, Sitka alder quickly invades disturbed sites having high water tables or seasonally high moisture such as from snow melt [7]. Dense stands of Sitka alder that develop can sometimes retard the establishment of conifers on the site, and these stands appear to be stable [2,46]. SEASONAL DEVELOPMENT : The staminate catkins of Sitka alder are produced during the preceeding growing season, and are exposed during the winter. The pistillate catkins emerge with the leaves in the spring [18]. Flowering occurs in the spring, cones ripen in mid-September to mid-November depending on latitude and elevation, and seed is dispersed immediately thereafter [20]. Leaves remain green until they are dropped in the fall.

FIRE ECOLOGY

SPECIES: Alnus viridis ssp. sinuata | Sitka Alder
FIRE ECOLOGY OR ADAPTATIONS : Sitka alder generally sprouts from the root crown following fire [16,47,52]. Numerous wind-dispersed seeds are produced by off-site plants and on-site plants which sprout following fire. Sitka alder's frequency and extent increase rapidly in early successional communities following fire [47,52]. Fire tends to occur infrequently on the moist sites occupied by Sitka alder communities [10]. The nonflammable bark and nonresinous leaves protect alders somewhat from low intensity fires [10]. POSTFIRE REGENERATION STRATEGY : survivor species; on-site surviving root crown or caudex off-site colonizer; seed carried by wind; postfire years one and two

FIRE EFFECTS

SPECIES: Alnus viridis ssp. sinuata | Sitka Alder
IMMEDIATE FIRE EFFECT ON PLANT : Severe fires can completely remove organic soil layers leaving alder roots exposed and charred, thus eliminating basal sprouting. Low to moderate severity fires kill only aboveground plant parts [21,52]. DISCUSSION AND QUALIFICATION OF FIRE EFFECT : NO-ENTRY PLANT RESPONSE TO FIRE : Sitka alder is generally favored by fire. It often increases in frequency and extent in the early seral communities that follow a fire. Although aboveground plant parts may be killed by fire, plants usually recover by sending up several new shoots from their root crown, which often increases stand density [16]. Sitka alder's wind-dispersed seeds quickly colonize soils exposed by fire, and seedlings often become an important part of the first postfire generation [47]. Throughout northern Idaho, Sitka alder is more common on burned lands than on unburned. On sites repeatedly burned over a 30-year period both frequency and cover have increased. In unburned climax coniferous stands, Sitka alder attained a frequency of less than 1 percent, but on nearby areas burned more than once, it had a frequency of 30 percent [37]. In another northern Idaho study, Sitka alder sprouts originating from root crowns following a wildfire flowered 5 years after the fire. Seedlings were first detected during the 8th postfire year with a 5 percent frequency, and 2 years later increased to a frequency of 75 percent [47]. Sitka alder, in the Kamloops Forest Region of British Columbia, reportedly takes 5 to 7 years to "recover" from broadcast burns of moderate to severe intensity [20]. DISCUSSION AND QUALIFICATION OF PLANT RESPONSE : In the subalpine fir zone of British Columbia, Sitka alder stands are common in some drier areas. Pojar and others [41] speculate that this may be related to fire history. Since Sitka alder is a nitrogen-fixing species, it may be a more successful invader in these drier areas where fires were hotter and removed much of the surface organic matter. FIRE MANAGEMENT CONSIDERATIONS : NO-ENTRY

REFERENCES

SPECIES: Alnus viridis ssp. sinuata | Sitka Alder
REFERENCES : 1. Agee, James K.; Kertis, Jane. 1987. Forest types of the North Cascades National Park Service Complex. Canadian Journal of Botany. 65: 1520-1530. [6327] 2. Aller, Alvin R. 1956. A taxonomic and ecological study of the flora of Monument Peak, Oregon. American Midland Naturalist. 56(2): 454-472. [6385] 3. Arno, Stephen F.; Hammerly, Ramona P. 1977. Northwest trees. Seattle, WA: The Mountaineers. 222 p. [4208] 4. Bernard, Stephen R.; Brown, Kenneth F. 1977. Distribution of mammals, reptiles, and amphibians by BLM physiographic regions and A.W. Kuchler's associations for the eleven western states. Tech. Note 301. Denver, CO: U.S. Department of the Interior, Bureau of Land Management. 169 p. [434] 5. Brayshaw, T. Christopher. 1976. Catkin bearing plants of British Columbia. Occas. Pap. No. 18. Victoria, BC: The British Columbia Provincial Museum. 176 p. [6170] 6. Cole, David N. 1982. Vegetation of two drainages in Eagle Cap Wilderness, Wallowa Mountains, Oregon. Res. Pap. INT-288. Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station. 42 p. [658] 7. Cooper, Stephen V.; Neiman, Kenneth E.; Steele, Robert; Roberts, David W. 1987. Forest habitat types of northern Idaho: a second approximation. Gen. Tech. Rep. INT-236. Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Research Station. 135 p. [867] 8. Curtis, Alan B. 1986. Camas Swale Research Natural Area. Supplement No. 21. In: Franklin, Jerry F.; Hall, Frederick C.; Dyrness, C. T.; Maser, Chris. Federal research natural areas in Oregon and Washington: A guidebook for scientists and educators. Portland, OR: U.S. Department of Agriculture, Forest and Range Experiment Station. 18 p. [226] 9. Daubenmire, Rexford F.; Daubenmire, Jean B. 1968. Forest vegetation of eastern Washington and northern Idaho. Technical Bulletin 60. Pullman, WA: Washington State University, Agricultural Experiment Station. 104 p. [749] 10. Davis, Kathleen M.; Clayton, Bruce D.; Fischer, William C. 1980. Fire ecology of Lolo National Forest habitat types. INT-79. Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station. 77 p. [5296] 11. Dayton, William A. 1931. Important western browse plants. Misc. Publ. 101. Washington, DC: U.S. Department of Agriculture. 214 p. [768] 12. Dittberner, Phillip L.; Olson, Michael R. 1983. The plant information network (PIN) data base: Colorado, Montana, North Dakota, Utah, and Wyoming. FWS/OBS-83/86. Washington, DC: U.S. Department of the Interior, Fish and Wildlife Service. 786 p. [806] 13. Dorn, Robert D. 1988. Vascular plants of Wyoming. Cheyenne, WY: Mountain West Publishing. 340 p. [6129] 14. Elliott, Charles L.; McKendrick, Jay D.; Helm, D. 1987. Plant biomass, cover, and survival of species used for stripmine reclamation in south-central Alaska, U.S.A. Arctic and Alpine Research. 19(4): 572-577. [6116] 15. Eyre, F. H., ed. 1980. Forest cover types of the United States and Canada. Washington, DC: Society of American Foresters. 148 p. [905] 16. Fischer, William C.; Bradley, Anne F. 1987. Fire ecology of western Montana forest habitat types. Gen. Tech. Rep. INT-223. Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Research Station. 95 p. [633] 17. Franklin, Jerry F.; Dyrness, C. T. 1973. Natural vegetation of Oregon and Washington. Gen. Tech. Rep. PNW-8. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 417 p. [961] 18. Furlow, John J. 1979. The systematics of the American species of Alnus (Betulaceae) Part 1. Rhodora. 81(825): 1-121. [6195] 19. Garrison, George A.; Bjugstad, Ardell J.; Duncan, Don A.; [and others]. 1977. Vegetation and environmental features of forest and range ecosystems. Agric. Handb. 475. Washington, DC: U.S. Department of Agriculture, Forest Service. 68 p. [998] 20. Haeussler, S.; Coates, D. 1986. Autecological characteristics of selected species that compete with conifers in British Columbia: a literature review. Land Management Report No. 33. Victoria, BC: Ministry of Forests, Information Services Branch. 180 p. [1055] 21. Hanson, William A. 1979. Preliminary results of the Bear Creek fire effects studies. Proposed open file report. Anchorage, AK: U.S. Department of the Interior, Bureau of Land Management, Anchorage District Office. 83 p. [6400] 22. Harrington, Constance A.; Deal, Robert L. 1982. Sitka alder, a candidate for mixed stands. Canadian Journal of Forest Research. 12: 108-111. [6378] 23. Hayes, Doris W.; Garrison, George A. 1960. Key to important woody plants of eastern Oregon and Washington. Agric. Handb. 148. Washington, DC: U.S. Department of Agriculture, Forest Service. 227 p. [1109] 24. Healy, William M.; Gill, John D. 1974. Alders. In: Gill, John D.; Healy, William M., compilers. Shrubs and vines for Northeastern wildlife. Gen. Tech. Rep. NE-9. Broomall, PA: U.S. Department of Agriculture, Forest Service: 6-9. [6208] 25. Hitchcock, C. Leo; Cronquist, Arthur. 1964. Vascular plants of the Pacific Northwest. Part 2: Salicaceae to Saxifragaceae. Seattle, WA: University of Washington Press. 597 p. [1166] 26. Holloway, Patricia; Zasada, John. 1979. Vegetative propagation of 11 common Alaska woody plants. Res. Note PNW-334. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 12 p. [1183] 27. Hosie, R. C. 1969. Native trees of Canada. 7th ed. Ottawa, ON: Canadian Forestry Service, Department of Fisheries and Forestry. 380 p. [3375] 28. Hungerford, Roger D. 1986. Vegetation response to stand cultural operations on small stem lodgepole pine stands in Montana. In: Weed control for forest productivity in the interior West; 1985 February 5-7; Spokane, WA. Pullman, WA: Washington State University, Cooperative Extension: 63-71. [5896] 29. Johnson, D. 1968. Taxonomy and distribution of northwestern alders. In: Trappe, J. M.; Franklin, J. F.; Tarrant, R. F.; Hansen, G. M., ed. Biology of alder; 1967 April 14-15; Pullman, WA. Portland, OR: U. S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station: 9-22. [6187] 30. Kartesz, John T.; Kartesz, Rosemarie. 1980. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. Volume II: The biota of North America. Chapel Hill, NC: The University of North Carolina Press; in confederation with Anne H. Lindsey and C. Richie Bell, North Carolina Botanical Garden. 500 p. [6954] 31. Krajina, V. J.; Klinka, K.; Worrall, J. 1982. Distribution and ecological characteristics of trees and shrubs of British Columbia. Vancouver, BC: University of British Columbia, Department of Botany and Faculty of Forestry. 131 p. [6728] 32. Kuchler, A. W. 1964. Manual to accompany the map of potential vegetation of the conterminous United States. Special Publication No. 36. New York: American Geographical Society. 77 p. [1384] 33. Kufeld, Roland C.; Wallmo, O. C.; Feddema, Charles. 1973. Foods of the Rocky Mountain mule deer. Res. Pap. RM-111. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station. 31 p. [1387] 34. Lawrence, Donald B. 1958. Glaciers and vegetation in southeastern Alaska. American Scientist. 46: 89-122. [6386] 35. Little, Elbert L., Jr. 1979. Checklist of United States trees (native and naturalized). Agric. Handb. 541. Washington, DC: U.S. Department of Agriculture, Forest Service. 375 p. [2952] 36. Martin, Alexander C.; Zim, Herbert S.; Nelson, Arnold L. 1951. American wildlife and plants. New York: McGraw-Hill Book Company, Inc. 500 p. [4021] 37. Mueggler, Walter F. 1965. Ecology of seral shrub communities in the cedar-hemlock zone of northern Idaho. Ecological Monographs. 35: 165-185. [4016] 38. Oliver, Chadwick D.; Adams, A. B.; Zasoski, Robert J. 1985. Disturbance patterns and forest development in a recently deglaciated valley in the northwestern Cascade Range of Washington, U.S.A. Canadian Journal of Forest Research. 15: 221-232. [6387] 39. Patterson, Patricia A.; Neiman, Kenneth E.; Tonn, Jonalea. 1985. Field guide to forest plants of northern Idaho. Gen. Tech. Rep. INT-180. Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Research Station. 246 p. [1839] 40. Pfister, Robert D.; Kovalchik, Bernard L.; Arno, Stephen F.; Presby, Richard C. 1977. Forest habitat types of Montana. Gen. Tech. Rep. INT-34. Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station. 174 p. [1878] 41. Pojar, J.; Trowbridge, R.; Coates, D. 1984. Ecosystem classification and interpretation of the sub-boreal spruce zone, Prince Rupert Forest Region, British Columbia. Land Management Report No. 17. Victoria, BC: Province of British Columbia, Ministry of Forests. 319 p. [6929] 42. Raunkiaer, C. 1934. The life forms of plants and statistical plant geography. Oxford: Clarendon Press. 632 p. [2843] 43. Root, Robert A.; Habeck, James R. 1972. A study of high elevational grassland communities in western Montana. American Midland Naturalist. 87(1): 109-121. [4005] 44. Schopmeyer, C. S. 1974. Alnus B. Ehrh. alder. In: Schopmeyer, C. S., technical coordinator. Seeds of woody plants in the United States. Agric. Handb. 450. Washington, DC: U.S. Department of Agriculture, Forest Service: 206-211. [7460] 45. Steele, Robert; Geier-Hayes, Kathleen. 1987. The grand fir/blue huckleberry habitat type in central Idaho: succession and management. Gen. Tech. Rep. INT-228. Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Research Station. 66 p. [8133] 46. Steele, Robert; Pfister, Robert D.; Ryker, Russell A.; Kittams, Jay A. 1981. Forest habitat types of central Idaho. Gen. Tech. Rep. INT-114. Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station. 138 p. [2231] 47. Stickney, Peter F. 1986. First decade plant succession following the Sundance Forest Fire, northern Idaho. Gen. Tech. Rep. INT-197. Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Research Station. 26 p. [2255] 48. Stickney, Peter F. 1989. Seral origin of species originating in northern Rocky Mountain forests. Unpublished draft on file at: U.S. Department of Agriculture, Forest Service, Intermountain Research Station, Fire Sciences Laboratory, Missoula, MT; RWU 4403 files. 7 p. [20090] 49. U.S. Department of Agriculture, Forest Service. 1937. Range plant handbook. Washington, DC. 532 p. [2387] 50. U.S. Department of Agriculture, Soil Conservation Service. 1982. National list of scientific plant names. Vol. 1. List of plant names. SCS-TP-159. Washington, DC. 416 p. [11573] 51. Zager, Peter Edward. 1980. The influence of logging and wildfire on grizzly bear habitat in northwestern Montana. Missoula, MT: University of Montana. 131 p. Dissertation. [5032] 52. Zasada, J. 1986. Natural regeneration of trees and tall shrubs on forest sites in interior Alaska. In: Van Cleve, K.; Chapin, F. S., III; Flanagan, P. W.; [and others], eds. Forest ecosystems in the Alaska taiga: A synthesis of structure and function. New York: Springer-Verlag: 44-73. [2291]

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