General: Perennial herb from a stout rhizome, smooth; stems erect to ascending, 25-120 cm tall, sometimes branched above.
Leaves: Basal leaves several, 10-50 cm long, pinnately compound, with stipules fused to base of long leaf-stalks and forming membranous margins; leaflets 7 to 17, egg-shaped to oblong, 2-7 cm long, coarsely saw-toothed; stem leaves alternate, 1 to 3, reduced, with free leaflet-like stipules.
Flowers: Inflorescence a dense, cylindric, long-stalked spike, sometimes tapering at the top, of numerous small flowers, the spike 3-13 cm long; corollas absent; calyces greenish- or yellowish-white, sometimes purplish tinged at the tip, 4-lobed, the lobes oval, 2.5-3 mm long; ovaries superior; stamens 4, the filaments somewhat dilated above, at least 3 times as long as the calyx-lobes.
Fruits: Achenes, enclosed in the 4-angled, slightly winged hypanthium.
Fens, swamps, streambanks, moist to wet meadows, forest openings and seepage areas in the montane to lower alpine zones; common in much of BC, absent in NE, SC and SE BC; N to AK, E to NF and S to NC, DE, OR and ID.
A shade-intolerant, submontane to subalpine, Asian and trans-continental North American forb. Species occurs on very moist to wet soils. Widespread but scattered on water-receiving and water-collecting sites in boreal, cool temperate, and cool mesothermal climates. Most common in non-forested semiterrestrial, often Sphagnum-dominated communities. Characteristic of wetlands.
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2019. E-Flora BC:
Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for
Advanced Spatial Analysis, Department of Geography, University of British
Columbia, Vancouver. [Accessed:
2020-02-28 9:00:54 PM
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