Micranthes razshivinii |
Micranthes tolmiei |
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large-petal saxifrage, razshivin's saxifrage |
alpine saxifrage, Tolmie's alpine saxifrage, Tolmie's saxifrage |
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Habit | Plants solitary or in clusters, rhizomatous. | Plants mat-forming, (stems trailing, thin, basally slightly woody), with slender, woody caudices. |
Leaves | basal; petiole ± distinct to indistinct, flattened, (0.3–)0.5–3 cm; blade oblanceolate to narrowly oblanceolate or narrowly spatulate, sometimes ± narrowly obovate, (0.5–)0.9–3.5 cm, ± fleshy, base ± attenuate to cuneate, margins (3–)5–7(–9)-toothed in distal 1/2 (teeth 0.5 mm), sparsely ciliate, surfaces glabrous. |
cauline, proximally crowded; petiole absent; blade elliptic-obovate, 0.8–1.5 cm, fleshy, base cuneate, margins entire, sometimes proximally sparsely long-ciliate, surfaces glabrous. |
Inflorescences | (2–)4–16-flowered, open, racemiform, sometimes paniculiform thyrses, sometimes solitary flowers, 3–15.5(–17 in fruit) cm, glabrous; (bracts reduced). |
2–10-flowered, lax cymes, sometimes solitary flowers, 3–12 cm, glabrous or purplish- or pink-tipped stipitate-glandular; (bracts 1–3, proximal). |
Flowers | sepals reflexed, oblong or lanceolate to ovate; petals white to cream, often purplish, not spotted, linear to ± narrowly elliptic, not clawed, 2–4 mm, usually longer to sometimes shorter than sepals; filaments linear, flattened; pistils connate 1/2+ their lengths, (conic); ovary ± 1/2 inferior. |
sepals erect to spreading, ovate; petals white, not spotted, linear to oblanceolate, 2.5–5 mm, longer than sepals, short- or not clawed; filaments broadly club-shaped (± petaloid); pistils connate to 1/2 their lengths; ovary ± superior (to 1/4 adnate to hypanthium). |
Capsules | dark purple-black, valvate. |
green, purple mottled, valvate. |
2n | = 30. |
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Micranthes razshivinii |
Micranthes tolmiei |
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Phenology | Flowering summer. | Flowering summer. |
Habitat | Tundra, stream banks, alpine rocky slopes | Arctic and alpine tundra, fell-fields |
Elevation | 400-2000 m (1300-6600 ft) | 500-4000 m (1600-13100 ft) |
Distribution |
AK; NT; YT |
AK; CA; ID; MT; NV; OR; UT; WA; BC
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Discussion | Micranthes razshivinii is found in eastern Alaska (eastern Brooks Range, from Atigun Pass eastward and from Mount McKinley National Park eastward) into Yukon and in the Mackenzie and Richardson mountains in the Northwest Territories. Its leaves are generally narrower than those of M. calycina and the teeth are less numerous. The glabrous inflorescence branches of M. razshivinii readily distinguish it from M. calycina, which has hairy branches. The ranges of the two species may overlap or at least abut in the Atigun Pass area of the Brooks Range, in the Mount McKinley National Park area, and possibly in the Saint Elias Mountains. Hybrids would be very difficult to distinguish from the parents but may occur. They have not been observed in the material examined. 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.) |
Unlike those of most Micranthes species, the leaves of M. tolmiei are proximally cauline and the ovules have two integuments. The seeds have a loose, winglike testa. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 8, p. 59. | FNA vol. 8, p. 54. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Saxifraga razshivinii | Saxifraga tolmiei, Saxifraga tolmiei var. ledifolia |
Name authority | (Zhmylev) Brouillet & Gornall: J. Bot. Res. Inst. Texas 1: 1021. (2007) | (Torrey & A. Gray) Brouillet & Gornall: J. Bot. Res. Inst. Texas 1: 1022. 2007 , |
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