Micranthes howellii |
Micranthes calycina |
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Howell's saxifrage |
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Habit | Plants solitary or in groups, with bulbils on caudices. | Plants solitary or in clusters, rhizomatous. |
Leaves | basal; petiole flattened, 1–4 cm; blade oblong to narrowly ovate, 1–2(–3) cm, ± fleshy, base attenuate, margins sharply serrate, eciliate, surfaces sparsely tangled, reddish brown-hairy abaxially, glabrous adaxially. |
basal; petiole ± distinct, flattened, (0.5–)1–3.5 cm; blade rhombic or fan-shaped, sometimes nearly round, (1–)1.5–3.5 cm, ± fleshy, base attenuate to ± cuneate, margins 7–11-toothed in distal 1/2–2/3 (teeth 1–3 mm), sparsely ciliate, surfaces glabrous. |
Inflorescences | 5–10(–20)-flowered, very open, lax, ± flat-topped cymes or thyrses, 5–10(–20) cm, glabrate to sparsely purple-tipped stipitate-glandular; (bracts glabrous). |
3–15-flowered, usually racemiform, sometimes paniculiform thyrses, 3–15 cm, axis glabrous or sparsely long-hairy, branches ± densely (rarely sparsely) long tangled-hairy; (bracts reduced). |
Flowers | sepals strongly reflexed, elliptic, (surfaces glabrous); petals white, not spotted, obovate to elliptic, clawed, 2.5–4.5 mm, longer than sepals; filaments linear, flattened; pistils distinct almost to base; ovary ± superior. |
sepals reflexed, lanceolate to ovate; petals white to cream, sometimes purplish, not spotted, linear to narrowly elliptic, not clawed, 2–4 mm, longer than sepals; filaments linear, flattened; pistils connate 1/2+ their lengths, (conic); ovary ± 1/2 inferior. |
Capsules | purple, valvate. |
purple-black, valvate. |
2n | = 24. |
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Micranthes howellii |
Micranthes calycina |
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Phenology | Flowering early spring–early summer. | Flowering summer. |
Habitat | Wet, rocky ledges and crevices | Flushes, stream banks, tundra, around late snowbeds, screes |
Elevation | 0-900 m (0-3000 ft) | (0-)30-1700 m ((0-)100-5600 ft) |
Distribution |
CA; OR
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AK; e Asia (Russian Far East) |
Discussion | Micranthes calycina is found mostly in western Alaska, in the north from the Seward Peninsula to the Brooks Range west of Atigun Pass, and in the south from Unimak Island and the Ahklum Mountains to the Saint Elias Mountains. It is also present on the main Bering Sea islands, but apparently not on the Aleutians west of Unimak. Plants of this species sometimes have been misidentified as M. davurica (Willdenow) Small, a species restricted to eastern Siberia. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 8, p. 63. | FNA vol. 8, p. 59. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Saxifraga howellii | Saxifraga calycina, Saxifraga davurica subsp. grandipetala, Saxifraga davurica var. grandipetala |
Name authority | (Greene) Small: in N. L. Britton et al., N. Amer. Fl. 22: 140. (1905) | (Sternberg) Gornall & H. Ohba: J. Bot. Res. Inst. Texas 1: 1020. (2007) |
Web links |