Flora of North America species comparison

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Enemion hallii

Hall's false rue anemone, Willamette false rue-anemone, Willamette isopyrum, Willamette rue-anemone
Stems

35-85 cm, with short, stout, woody rhizome;

roots fibrous.
Leaves

leaflets variously lobed and sharply dentate, apex acute, glandular-apiculate;

surfaces abaxially pubescent.
Inflorescences

terminal or axillary, well-defined 3-10-flowered cymes with small scalelike bracts;

peduncle not strongly clavate.
Flowers

sepals 5-10.5 × 2.5-6.5 mm;

stamens 50-75;

filaments filiform to club-shaped, 4.5-8.2 mm.
Seeds

1.8-2.2 mm, glabrous.
Follicles

sessile, upright to widely divergent;

body widely elliptic to widely obovate, 3.8-7 mm, gradually contracted into style beak;

beak 1.1-2.5 mm.

Enemion hallii
Phenology Flowering late spring–early summer.
Habitat Moist woods and streambanks
Elevation 100-1500 m (300-4900 ft)
Distribution
from FNA
OR; WA
[WildflowerSearch map]
[BONAP county map]
Discussion

Enemion hallii differs from all other North American members of the genus in having well-defined cymose inflorescences. Its closest ally is thought to be the east-Asian species E. raddeanum Regel, from which it differs in having long-petiolate leaves and cymose inflorescences with bracteolate subumbels. Enemion raddeanum is characterized by sessile or short-petiolate leaves and simple, umbellate inflorescences.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 3.
Parent taxa Ranunculaceae > Enemion
Sibling taxa
E. biternatum, E. occidentale, E. savilei, E. stipitatum
Synonyms Isopyrum hallii
Name authority (A. Gray) J. R. Drummond & Hutchinson: Bull. Misc. Inform. Kew 1920: 161. (1920)
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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