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You are here >1Up Info > Wildlife, Animals, and Plants > Plant Species > Shrub > Species: Spiraea douglasii | Douglas' Spirea
 

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BOTANICAL AND ECOLOGICAL CHARACTERISTICS

SPECIES: Spiraea douglasii | Douglas' Spirea
GENERAL BOTANICAL CHARACTERISTICS : Douglas' spirea is a rhizomatous, deciduous shrub with erect, spreading stems 3 to 6 feet (1-1.8 m) tall [17,35,40]. Leaves are 1 to 4 inches (3-10 cm) long [20,35]. Seeds are 0.08 inch (2 mm) long [40]. Douglas'spirea forms adventitious roots after burial [1]. RAUNKIAER LIFE FORM : Phanerophyte REGENERATION PROCESSES : Douglas' spirea is a rhizomatous shrub that often forms dense colonies [1,4,32]. It will sprout from the stem base and root crown following disturbance [4,29]. In Washington following the May 18, 1980 volcanic eruption of Mount St. Helens, Douglas' spirea showed extensive rhizome development in the tephra (volcanic aerial ejecta) and contained one to five adventitious roots per centimeter of stem 1 year after burial. Maximum adventitious root length of Douglas' spirea was 3.6 inches (9 cm) [1]. Douglas' spirea produces small seeds that are probably dispersed via animals and strong winds [40]. SITE CHARACTERISTICS : Douglas' spirea occurs in riparian areas including wet meadows, floodplains, terraces, bogs, swamps, and along streams, rivers, lakes, springs, and ponds [4,12,17,23,24]. Douglas' spirea grows best on moist to semiwet soils with good drainage [20,28,29,32,35]. It grows best on loam and sandy loam soils, but occurs on silty clay, clay loam, and gravelly substrates as well [17,19,23,29,42]. Douglas' spirea is tolerant of permanently water-logged soils (peat) and widely fluctuating water tables [23,28]. Elevations for Douglas' spirea are as follows: feet meters California 4,620-6,435 1,400-1,950 [20,46] Montana 3,760-6,700 1,147-2,044 [4,35] Oregon 2,200-5,800 660-1,740 [29] Washington 2,500-5,000 750-1,500 [19] SUCCESSIONAL STATUS : Douglas' spirea occurs mostly in seral communities [2,4,7,27,37]. It is generally shade intolerant [28], but horticultural specimens have been described as shade tolerant [11,20]. In British Columbia Douglas' spirea is a pioneer species in disclimax communities maintained by avalanches [2]. In southwestern British Columbia and northwestern Washington, Douglas' spirea is a pioneer species on clearcut sites [27,37]. In northwestern Montana a Douglas' spirea community type may be seral to an as yet undefined thinleaf alder/Douglas' spirea habitat type [4]. Douglas' spirea often forms dense impenetrable thickets in riparian areas [4]. In Washington Douglas' spirea usually occurs in mosaics with other hydric and mesic non-forest species in riparian forest openings [19]. SEASONAL DEVELOPMENT : In California Douglas' spirea flowers from June to September [40].

Related categories for Species: Spiraea douglasii | Douglas' Spirea

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Information Courtesy: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory. Fire Effects Information System

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