DISTRIBUTION AND OCCURRENCE
SPECIES: Scirpus americanus | Olney Threesquare 



GENERAL DISTRIBUTION : 
Although Olney threesquare is sporadically distributed from Nova Scotia
to Washington state and south to South America, it grows primarily along
the Atlantic and Gulf coasts and in arid western states [28].


ECOSYSTEMS : 
   FRES29  Sagebrush
   FRES30  Desert shrub
   FRES38  Plains grasslands
   FRES41  Wet grasslands


STATES : 
     AL  AR  AZ  CA  CT  DE  FL  GA  ID  KS
     LA  MA  MD  MI  MS  NC  NH  NJ  NM  NV
     NY  OH  OK  OR  RI  SC  TX  UT  VA  WA
     NS  MEXICO


ADMINISTRATIVE UNITS : 
     ACAD  AGFO  ARCH  ASIS  BRCA  CACH
     CANY  CAHA  CALO  CARE  CUIS  DEVA
     FIIS  GRCA  GRTE  GUIS  LAME  OLYM
     ORPI  PORE  SAMO  YELL


BLM PHYSIOGRAPHIC REGIONS : 
    3  Southern Pacific Border
    4  Sierra Mountains
    5  Columbia Plateau
    6  Upper Basin and Range
    7  Lower Basin and Range
    9  Middle Rocky Mountains
   14  Great Plains


KUCHLER PLANT ASSOCIATIONS : 
   K033  Chaparral
   K040  Saltbush - greasewood
   K041  Creosotebush
   K042  Creosotebush - bursage
   K049  Tule marshes
   K055  Sagebrush steppe
   K073  Northern cordgrass prairie
   K078  Southern cordgrass prairie
   K098  Northern floodplain forest


SAF COVER TYPES : 
   222  Black cottonwood - willow
   235  Cottonwood - willow


SRM (RANGELAND) COVER TYPES : 
NO-ENTRY


HABITAT TYPES AND PLANT COMMUNITIES : 
Olney threesquare forms nearly monodominant stands in some marshes.  In
coastal areas it is most abundant in brackish marshes and is commonly
associated with seashore saltgrass (Distichlis spicata var. spicata),
marshhay cordgrass (Spartina patens), big cordgrass (S. cynosuroides),
smooth cordgrass (S. alterniflora), and saltmarsh bulrush (Scirpus
robustus) [20,28].  In desert regions of the West, Olney threesquare
often dominates or codominates slightly to moderately saline marshes
bordering lakes or springs.  Codominants of western marshes include
creeping spikerush (Eleocharis palustris), Nebraska sedge (Carex
nebraskensis), inland saltgrass (Distichlis spicata var. stricta),
berula (Berula erecta), and marsh yellowcress (Rorippa islandica)
[3,26,32].

Olney threesquare dominated communities are described in the following
publications:

Aquatic and semiaquatic vegetation of Utah Lake and its bays [3]

Plant ecology of spring-fed salt marshes in western Utah [2]

Related categories for Species: Scirpus americanus | Olney Threesquare