Anemone richardsonii |
Anemone americana |
|
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anémone de Richardson, yellow anemone, yellow thimbleweed |
anémone d'amérique, blunt-lobed hepatica, hépatique d'amérique, round-lobed hepatica, roundlobe hepatica |
|
Aerial shoots | 5-30 cm, from rhizomes, rhizomes horizontal. |
5-18 cm, from rhizomes, rhizomes ascending to horizontal. |
Basal leaves | 1, simple; petiole (0.8-)2-8(-12) cm; leaf blade reniform to ±orbiculate, (1-)1.5-3(-4) × 1.5-4 cm, base somewhat cordate, margins crenate to serrate ±throughout, apex acute to broadly acute, surfaces glabrous or ±villous, or abaxially glabrescent; segments primarily 3, rhombic; lateral segments unlobed or 1x-lobed; ultimate lobes 4-10(-15) mm wide. |
3-15, often purplish abaxially, simple, deeply divided; petiole 5-20 cm; leaf blade widely orbiculate, 1.5-7 × 2-10 cm, base cordate, margins entire, apex rounded, surfaces strongly villous to glabrescent; lobes 3(-4), widely ovate, 1-4 cm wide; middle lobe 50-70(-75)% of total blade length. |
Inflorescences | 1-flowered; peduncle puberulous; involucral bracts 2-3, 1-tiered, simple, ±similar to basal leaves, primarily rhombic, 1-3.5 cm, bases distinct, cuneate, margins crenate on distal 1/2, apex acute to narrowly acute, surfaces glabrous or ±villous, or abaxially glabrescent; segments 3, primarily rhombic; lateral segments unlobed, 2-10 mm wide. |
1-flowered, villous to pilose; involucral bracts 3, 1-tiered, simple, dissimilar to basal leaves, sessile, calyx-like, closely subtending flower, ovate or elliptic, 0.65-1.8 × 0.5-1.2 cm, bases distinct, cuneate, margins entire, apex obtuse, strongly villous to glabrescent. |
Flowers | sepals (4-)6(-8), yellow (rarely abaxially yellow, tinged blue, and adaxially yellow), elliptic, 8-15 × 4-10 mm, abaxially villous, especially proximally, adaxially glabrous; stamens 25-55. |
sepals 5-12, white to pink or bluish, ovate to obovate 7.5-14.5 × 3.5-7.7 mm, glabrous; petals absent; stamens 10-30. |
Achenes | body ovoid to oblong, 3-4 × ca. 1.5 mm, not winged, glabrous; beak recurved, 4-6 mm, glabrous. |
body narrowly ovoid, 3.5-5 × 1.2-1.6 mm, slightly winged, hispid, gradually tapering; beak indistinct. |
Heads of achenes | loosely spheric; pedicel 3-20 cm. |
spheric; pedicel 0.1-0.4 cm. |
2n | =14. |
=14. |
Anemone richardsonii |
Anemone americana |
|
Phenology | Flowering spring–summer (May–Aug). | Flowering spring. |
Habitat | Thickets, moist woods, meadows, slopes | Mixed woods, often in association with both conifers and deciduous trees |
Elevation | 20-2200 m (100-7200 ft) | 0-1200 m (0-3900 ft) |
Distribution |
AK; AB; BC; MB; NF; NT; QC; SK; YT; Greenland; Asia
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AL; AR; CT; DC; DE; FL; GA; IA; IL; IN; KY; MA; MD; ME; MI; MN; MO; MS; NC; NH; NJ; NY; OH; PA; RI; SC; TN; VA; VT; WI; WV; MB; NB; NS; ON; QC
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Discussion | Anemone americana is found in habitats similar to those of A. acutiloba but usually in drier sites with more acid soils. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Anemone | Ranunculaceae > Anemone |
Sibling taxa | ||
Synonyms | A. vahlii | Hepatica triloba var. americana, Hepatica americana, Hepatica nobilis var. obtusa, Hepatica triloba var. obtusa |
Name authority | Hooker: Fl. Bor.-Amer. 1: 6. (1829) | (de Candolle) H. Hara: J. Jap. Bot. 33: 271. (1958) |
Web links |