E-Flora BC: Electronic Atlas of the Flora of British Columbia

Sanguisorba annua (Nutt. ex Hook.) Nutt. ex Torr. & A. Gray
western burnet (prairie burnet)
Rosaceae (Rose family)

Introduction to Vascular Plants
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Distribution of Sanguisorba annua
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Species Information

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Annual or biennial herb from a taproot, smooth; stems erect to ascending, 20-80 cm tall, freely branched.
Basal leaves withered at flowering time; stem leaves several to many, 3-10 cm long, pinnately compound, with stipules fused to base of long leaf-stalks and forming membranous margins; leaflets 9 to 17, oblong-elliptic, 0.5-2 cm long, pinnately cleft into linear segments; stipules of lower leaves fused to leaf-stalk below, free at the tip, entire, those of the upper leaves free, leaflet-like, pinnately cleft.
Inflorescence a dense, cylindric to globe-shaped, long-stalked spike, the spike 0.5-3 cm long, of numerous small flowers; corollas absent; calyces green, 4-lobed, the lobes egg-shaped, 2-3 mm long; ovaries superior; stamens usually 2, the filaments thread-like, about as long as the calyx-lobes.
Achenes, enclosed in the 4-angled, thick-edged but barely winged, weakly net-veined, smooth hypanthium.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Vernally moist to dry fields, grassy clearings and roadsides in the lowland, steppe and montane zones; infrequent in S BC; S to KS, TX, W MT and S CA.

Source: The Illustrated Flora of British Columbia


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Poteridium annuum (Nutt. ex Hook.) Spach
Sanguisorba occidentalis Nutt.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References