Micranthes nelsoniana |
Micranthes unalaschcensis |
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dotted saxifrage, heartleaf saxifrage, Nelson's saxifrage, saxifrage |
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Habit | Plants solitary or tufted, with bulbils on branched caudices, rhizomatous. | Plants solitary or tufted, with bulbils on caudices or rhizomatous. | ||||||||||||||||
Leaves | basal; petiole rounded, 3–30 cm; blade reniform to round, 2–9 cm, thin or slightly fleshy, sometimes thick and fleshy, base cordate, margins deeply crenate, eciliate or sparsely short glandular-ciliate, surfaces glabrous or ± hairy. |
basal; petiole flattened, 1–2 cm; blade broadly obovate to round, 1–3.5 cm, ± fleshy, base cuneate, margins distally toothed, sparsely ciliate, surfaces glabrous. |
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Inflorescences | 10+-flowered, ± open, lax to congested, conic, sometimes also glomerate thyrses, 10–35 cm, tangled-hairy (pilose-arachnoid) at least distally, sometimes also purple- or brown-tipped stipitate-glandular. |
2–10-flowered, open thyrses, racemiform distally, sometimes solitary flowers, 3–15 cm, tangled-hairy. |
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Flowers | sepals reflexed, ± ovate; petals white to pinkish, rarely orange-spotted, ovate to oblong, narrowly to broadly clawed, 2.5–4.5 mm, longer than sepals; filaments distinctly club-shaped; pistils connate 1/2–3/4 their lengths; ovary superior (to 1/3 adnate to hypanthium). |
sepals reflexed, ovate; petals white to cream or pinkish, not spotted, elliptic to oblong, ± clawed, 3.5–5 mm, longer than sepals; filaments linear, flattened; pistils connate 1/2+ their lengths; ovary at least 1/2 inferior. |
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Capsules | green to yellow and purplish tinged to dark purple, valvate. |
dark purple, valvate. |
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Micranthes nelsoniana |
Micranthes unalaschcensis |
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Phenology | Flowering summer. | |||||||||||||||||
Habitat | Tundra, flushes, stream banks, slopes | |||||||||||||||||
Elevation | 0-600 m (0-2000 ft) | |||||||||||||||||
Distribution |
AK; OR; WA; AB; BC; NT; NU; YT; Europe (ne Russia); Asia
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AK; e Asia (Russian Far East) |
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Discussion | Varieties 6 (5 in the flora). Although sometimes reported for North America, Saxifraga nelsoniana var. aestivalis (Fischer & C. A. Meyer) H. Ohba (S. aestivalis Fischer & C. A. Meyer) is found only in Eurasia. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
The ovaries and capsules of Micranthes unalaschensis are ovoid, thicker and plumper than those of M. calycina and M. razshivinii, which are conic (E. Hultén 1968). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 8, p. 54. | FNA vol. 8, p. 60. | ||||||||||||||||
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes | ||||||||||||||||
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Subordinate taxa | ||||||||||||||||||
Synonyms | Saxifraga nelsoniana, Saxifraga punctata subsp. nelsoniana, Saxifraga punctata var. nelsoniana | Saxifraga unalaschensis, Saxifraga calycina subsp. unalaschensis, Saxifraga davurica var. unalaschensis | ||||||||||||||||
Name authority | (D. Don) Small: in N. L. Britton et al., N. Amer. Fl. 22: 147. 1905 , | (Sternberg) Gornall & H. Ohba: J. Bot. Res. Inst. Texas 1: 1022. (2007) | ||||||||||||||||
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