Enemion hallii

(A. Gray) J. R. Drummond & Hutchinson

Bull. Misc. Inform. Kew 1920: 161. 1920.

Common names: Willamette rue-anemone
EndemicIllustrated
Basionyms: Isopyrum hallii A. Gray Proc. Amer. Acad. Arts 8: 374. 1872
Treatment appears in FNA Volume 3.

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. 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. Seeds 1.8-2.2 mm, glabrous.


Phenology: Flowering late spring–early summer.
Habitat: Moist woods and streambanks
Elevation: 100-1500 m

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.

Selected References

None.

Lower Taxa

None.

... more about "Enemion hallii"
glandular-apiculate +
Bruce A. Ford +
(A. Gray) J. R. Drummond & Hutchinson +
cuneate +, truncate +  and cordate +
Isopyrum hallii +
curved +  and straight +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
widely elliptic;widely obovate +
0.38 cm3.8 mm <br />0.0038 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
scale-like +
globose;cylindric +
Willamette rue-anemone +
3-10-flowered +
well-defined +
0 cm0 mm <br />0 m <br /> (4 cm40 mm <br />0.04 m <br />) +
nearly +  and sessile +
Oreg. +  and Wash. +
100-1500 m +
filiform +  and club-shaped +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.82 cm8.2 mm <br />0.0082 m <br />) +
2-10-flowered +
showy +  and inconspicuous +
0 cm0 mm <br />0 m <br /> (4 cm40 mm <br />0.04 m <br />) +
stipitate +, sessile +  and aggregate +
compressed +, elliptic +  and obovate +
Moist woods and streambanks +
axillary +  and terminal +
compound +  and simple +
whorled +, opposite +  and alternate +
cauline +  and basal +
palmate +  and pinnate +
entire;deeply 3-notched +
distinct +
conspicuous +
reduced +
Flowering late spring–early summer. +
2 +  and 10 +
Bull. Misc. Inform. Kew +
2-10-flowered +
0 cm0 mm <br />0 m <br /> (4 cm40 mm <br />0.04 m <br />) +
not arillate +  and stalked +
rugulose +
tinged pinkish;white +
not persistent +
distinct +
3 +  and 6 +
ovate +  and obovate +
0.35 cm3.5 mm <br />0.0035 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
Endemic +  and Illustrated +
35 cm350 mm <br />0.35 m <br /> (85 cm850 mm <br />0.85 m <br />) +
persistent +
Enemion hallii +
species +
herbaceous +  and woody +