Micranthes rufidula |
Micranthes nelsoniana |
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rusty-hair saxifrage |
dotted saxifrage, heartleaf saxifrage, Nelson's saxifrage, saxifrage |
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Habit | Plants solitary or in groups, with bulbils on caudices, or rhizomatous. | Plants solitary or tufted, with bulbils on branched caudices, rhizomatous. | ||||||||||||||||
Leaves | basal; petiole flattened, 4–8 cm; blade ovate to elliptic, 1–4 cm, fleshy, base attenuate to ± truncate, margins serrate (15–30- toothed), eciliate, surfaces densely tangled, reddish brown-hairy abaxially, glabrous adaxially. |
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. |
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Inflorescences | 15+-flowered, open, flat-topped thyrses, 5–20 cm, purple-tipped stipitate-glandular; (bracts often tangled brown-hairy). |
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. |
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Flowers | sepals spreading, ovate, (often tangled brown-hairy); petals white, not spotted, ovate to elliptic, clawed, 2–4 mm, longer than sepals; filaments linear, flattened to slightly club-shaped; pistils distinct almost to base; ovary superior, (to 1/3 adnate to hypanthium). |
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). |
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Capsules | greenish to reddish purple, folliclelike. |
green to yellow and purplish tinged to dark purple, valvate. |
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2n | = 20, 38, 56, 58. |
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Micranthes rufidula |
Micranthes nelsoniana |
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Phenology | Flowering late winter–summer. | |||||||||||||||||
Habitat | Wet to dry, rocky ledges | |||||||||||||||||
Elevation | 0-3000 m (0-9800 ft) | |||||||||||||||||
Distribution |
CA; OR; WA; BC
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AK; OR; WA; AB; BC; NT; NU; YT; Europe (ne Russia); Asia
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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.) |
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Key |
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Source | FNA vol. 8, p. 62. | FNA vol. 8, p. 54. | ||||||||||||||||
Parent taxa | ||||||||||||||||||
Sibling taxa | ||||||||||||||||||
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Synonyms | Saxifraga aequidentata, Saxifraga occidentalis subsp. rufidula, Saxifraga occidentalis var. rufidula, Saxifraga rufidula | Saxifraga nelsoniana, Saxifraga punctata subsp. nelsoniana, Saxifraga punctata var. nelsoniana | ||||||||||||||||
Name authority | Small: in N. L. Britton et al., N. Amer. Fl. 22: 140. (1905) | (D. Don) Small: in N. L. Britton et al., N. Amer. Fl. 22: 147. 1905 , | ||||||||||||||||
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