Flora of North America species comparison

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Poteridium annuum

Rosaceae subfam. rosoideae

annual burnet, prairie burnet, western burnet
Habit Plants winter-annual or biennial, glabrous; taproots 1–4(–6) dm. Herbs, shrubs, or subshrubs.
Leaves

alternate, rarely opposite, pinnately compound, sometimes simple or palmately compound;

stipules present, rarely absent.
Flowers

torus usually enlarged, sometimes small or absent;

carpels 1–260(–450), distinct, free, styles distinct, rarely connate (Roseae);

ovules 1(or 2), collateral (Rubeae) or superposed (Fallugia, Filipendula).
Stamens

(2 or)4.

Fruits

hypanthia ridges extended into thin wings, 0.5 mm wide;

sepals tuberculose-thickened proximally.

achenes or aggregated achenes sometimes with fleshy, urn-shaped hypanthium or enlarged torus, sometimes aggregated drupelets;

styles persistent or deciduous, not elongate (elongate but not plumose in Geum).
x

= 7(8).

Poteridium annuum

Rosaceae subfam. rosoideae
Phenology Flowering Mar–Jun; fruiting Apr–Jul.
Habitat Sandy and rocky soil, prairies, oak savannas, oak woodlands, disturbed areas (pastures, roadsides), often locally moister sites
Elevation 0–500 m (0–1600 ft)
Distribution
from FNA
AR; IA; KS; NY; OK; SC; TX; ON
[WildflowerSearch map]
[BONAP county map]
North America; Mexico; Central America; South America; West Indies; Bermuda; Eurasia; Africa; Atlantic Islands; Indian Ocean Islands; Pacific Islands; Australia
Discussion

The eastern records (Ontario, Iowa, Massachusetts, New York, and South Carolina) all appear to represent adventives or non-persistent waifs. A record from Maryland (J. B. S. Norton and R. G. Brown 1946) is plausible; no specimen is known to the author.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Variation in the number of genera in subfam. Rosoideae is due to differences in generic delimitation between D. Potter et al. (2007) and the authors of some Potentilleae genera. Cyanogenic glycosides and sorbitol are absent in the subfamily.

Tribes 6, genera 28–35, species ca. 1600 (6 tribes, 26 genera, 302 species, including 1 hybrid, in the flora)

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 9, p. 320. FNA vol. 9, p. 23. Author: Luc Brouillet.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Agrimonieae > Poteridium Rosaceae
Sibling taxa
P. occidentale
Subordinate taxa
Synonyms Poterium annuum, Sanguisorba annua
Name authority (Nuttall) Spach: Ann. Sci. Nat., Bot., sér. 3, 5: 43. (1846) Arnott: Botany, 107. (1832)
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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