Flora of North America species comparison

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Enemion stipitatum

Enemion biternatum

dwarf false rue anemone, Siskiyou false rue anemone, Siskiyou rue-anemone, western isopyrum

eastern false rue anemone, false rue anemone
Stems

3-12 cm, cespitose, not rhizomatous;

roots tuberous.

10-40 cm, weakly rhizomatous;

roots fibrous.
Leaves

abaxially glabrous;

leaflets entire or deeply 2-3-lobed, apex rounded, glandular-apiculate.

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

surfaces abaxially glabrous.
Inflorescences

axillary, flowers solitary;

peduncle strongly clavate.

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

peduncle not strongly clavate.
Flowers

sepals 3.5-6 × 1.4-2.5 mm;

stamens 8-15;

filaments flat, narrowly triangular, 1.9-3.2 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

0.9-1.4(-1.7) mm, glabrous.

2.1-2.7 mm, minutely pubescent.
Follicles

stipitate, upright and appressed;

body oblong, 4-8(-9) mm, abruptly contracted into style beak;

beak 0.5-1.5 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 stipitatum

Enemion biternatum
Phenology Flowering late winter–early spring. Flowering spring.
Habitat Shaded shrubby areas, oak woodlands, and moist deciduous or mixed evergreen forests, occasionally in open pastures Moist deciduous woods of valleys, flood plains, and ravine bottoms, occasionally in open pastures, often on limey soils
Elevation 200-1500 m (700-4900 ft) 25-1000 m (100-3300 ft)
Distribution
from FNA
CA; OR
[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 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. hallii, E. occidentale, E. savilei
E. hallii, E. occidentale, E. savilei, E. stipitatum
Synonyms Isopyrum stipitatum Isopyrum biternatum
Name authority (A. Gray) J. R. Drummond & Hutchinson: Bull. Misc. Inform. Kew 1920: 160. (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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