General: Perennial herb from a thick short rhizome, smooth, usually glaucous; stems erect, 20 to 150 cm tall, often branched above.
Leaves: Basal leaves several, 10-40 cm long, pinnately compound, with stipules fused to base of long leaf-stalks and forming membranous margins; leaflets 7 to 15, egg-shaped to lance-oblong, 1.5-4 cm long, coarsely saw-toothed, green above, paler beneath; stem leaves 1 or 2, similar but smaller and with fewer leaflets, with free leaflet-like stipules.
Flowers: Inflorescence a dense, cylindric to egg-shaped, long-stalked spike, 1-3 cm long, of numerous small flowers; corollas absent; calyces reddish-purple to maroon, 4-lobed, the lobes egg-shaped, 2-3 mm long; ovaries superior; stamens 4, the filaments linear, not flattened, about the same length as the calyx-lobes.
Fruits: Achenes, enclosed in the 4-angled, narrowly winged, hairy hypanthium.
A shade-intolerant, submontane to subalpine, circumpolar forb distributed in Pacific and Cordilleran North America. Species occurs on very moist to wet soils, nitrogen-medium, often disturbed 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.
Poterium officinale (L.) A. Gray Sanguisorba microcephala C. Presl Sanguisorba officinalis subsp. microcephala (C. Presl) Calder & Roy L. Taylor Sanguisorba officinalis var. polygama (W. Nyl.) Mela & A. Caj.
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2020. 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:
2021-06-23 7:25:00 AM
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