Flora of North America species comparison

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Poteridium occidentale

annual burnet, western burnet
Habit Plants winter-annual, glabrous; taproots 3–10 dm.
Stamens

2(or 4).
Fruits

hypanthia ridges rounded, thickened;

sepals not thickened proximally.

Poteridium occidentale
Phenology Flowering May–Jul; fruiting Jun–Aug.
Habitat Prairies, sandy open ground, sagebrush flats, vernal pools, drawdown shorelines of streams and lakes, grassy clearings, roadsides, particularly with surficial or subterranean moisture
Elevation 10–2100 m (0–6900 ft)
Distribution
from FNA
AZ; CA; ID; MT; NM; NV; OR; WA; WY; BC
Discussion

The taxonomic status of Poteridium occidentale has been controversial. Most floristicians of the twentieth century accepted it as distinct from the more eastern P. annuum (usually treating the two in Sanguisorba); but in recent decades a trend developed to merge the two taxa. While superficially similar, they seem to represent independent evolutionary lineages, as indicated by morphologic distinctions and allopatric distributions.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 9, p. 320.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Agrimonieae > Poteridium
Sibling taxa
P. annuum
Synonyms Sanguisorba occidentalis
Name authority (Nuttall) Rydberg: in N. L. Britton et al., N. Amer. Fl. 22: 388. (1908)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Fabaceae, Apiaceae, Boraginaceae, and Polemoniaceae.)

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