Flora of North America species comparison

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Enemion hallii

Enemion biternatum

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

eastern false rue anemone, false rue anemone
Stems

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

roots fibrous.

10-40 cm, weakly rhizomatous;

roots fibrous.
Leaves

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

surfaces abaxially pubescent.

leaflets irregularly 2-3-lobed, lobes sometimes with 1-3 secondary lobes, apex rounded, glandular-apiculate;

surfaces abaxially glabrous.
Inflorescences

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

peduncle not strongly clavate.

axillary, flowers solitary or loosely grouped in 2-4-flowered leafy racemes;

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.

sepals 5.5-13.5 × 3.5-8.5 mm;

stamens 25-50;

filaments filiform to club-shaped, 1.8-5.8 mm.
Seeds

1.8-2.2 mm, glabrous.

2.1-2.7 mm, minutely pubescent.
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.

sessile, upright to widely divergent;

body widely elliptic to widely obovate, 3.5-6.5 mm, gradually contracted into style beak;

beak 1.7-3 mm.
2n

= 14.

Enemion hallii

Enemion biternatum
Phenology Flowering late spring–early summer. Flowering spring.
Habitat Moist woods and streambanks Moist deciduous woods of valleys, flood plains, and ravine bottoms, occasionally in open pastures, often on limey soils
Elevation 100-1500 m (300-4900 ft) 25-1000 m (100-3300 ft)
Distribution
from FNA
OR; WA
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; AR; FL; IA; IL; IN; KS; KY; MI; MN; MO; MS; NC; NY; OH; OK; SC; SD; TN; VA; WI; WV; ON
[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.)

Enemion biternatum has been mistaken for the superficially similar Thalictrum thalictroides because of its white flowers and compound Thalictrum-like leaves. Enemion biternatum is easily distinguished, however, by its few-seeded follicles and deeply lobed leaves with glandular-apiculate apices. Thalictrum thalictroides, on the other hand, is characterized by having achenes and somewhat crenate leaves with notched apices.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 3. FNA vol. 3.
Parent taxa Ranunculaceae > Enemion Ranunculaceae > Enemion
Sibling taxa
E. biternatum, E. occidentale, E. savilei, E. stipitatum
E. hallii, E. occidentale, E. savilei, E. stipitatum
Synonyms Isopyrum hallii Isopyrum biternatum
Name authority (A. Gray) J. R. Drummond & Hutchinson: Bull. Misc. Inform. Kew 1920: 161. (1920) Rafinesque: J. Phys. Chim. Hist. Nat. Arts 91: 70. (1820)
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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