Micranthes nelsoniana |
Micranthes nelsoniana var. cascadensis |
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dotted saxifrage, heartleaf saxifrage, Nelson's saxifrage, saxifrage |
Cascade saxifrage, Cascades dotted saxifrage, dotted saxifrage, Nelson's saxifrage |
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Habit | Plants solitary or tufted, with bulbils on branched caudices, 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. |
blades thin, not fleshy, margins 12–18-toothed. |
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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. |
somewhat lax, tangled-appressed 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). |
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Pistils | connate most of their lengths. |
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Capsules | green to yellow and purplish tinged to dark purple, valvate. |
3–8 mm. |
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Micranthes nelsoniana |
Micranthes nelsoniana var. cascadensis |
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Phenology | Flowering late spring–summer. | |||||||||||||||||
Habitat | Wet areas, stream banks | |||||||||||||||||
Elevation | 800-2500 m (2600-8200 ft) | |||||||||||||||||
Distribution |
AK; OR; WA; AB; BC; NT; NU; YT; Europe (ne Russia); Asia
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OR; WA; BC |
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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.) |
Variety cascadensis has sometimes been confused with Micranthes odontoloma, probably because the petal spots of var. cascadensis fade on herbarium specimens. The more deeply toothed leaves, the compactness of the inflorescence, and the tangled inflorescence hairs clearly distinguish it from M. odontoloma. This variety is present in the Coast and Cascade ranges. (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. 56. | ||||||||||||||||
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes > Micranthes nelsoniana | ||||||||||||||||
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Subordinate taxa | ||||||||||||||||||
Synonyms | Saxifraga nelsoniana, Saxifraga punctata subsp. nelsoniana, Saxifraga punctata var. nelsoniana | Saxifraga punctata subsp. cascadensis, Saxifraga nelsoniana subsp. cascadensis, Saxifraga punctata var. cascadensis | ||||||||||||||||
Name authority | (D. Don) Small: in N. L. Britton et al., N. Amer. Fl. 22: 147. 1905 , | (Calder & Savile) Gornall & H. Ohba: J. Bot. Res. Inst. Texas 1: 1020. (2007) | ||||||||||||||||
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