Micranthes nelsoniana |
Micranthes hieraciifolia |
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dotted saxifrage, heartleaf saxifrage, Nelson's saxifrage, saxifrage |
hawkweed-leaf saxifrage |
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Habit | Plants solitary or tufted, with bulbils on branched caudices, rhizomatous. | Plants mostly solitary, with short caudices, sometimes 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 sometimes indistinct, flattened, 2–4 cm; blade ovate to elliptic, 2–6 cm, ± fleshy, base cuneate to slightly attenuate, margins usually ± evenly serrulate to denticulate, ciliate, surfaces sparsely to densely hairy and sparsely stipitate-glandular. |
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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. |
30+-flowered, constricted, spikelike thyrses, 7–30 cm, tangled-hairy proximally, densely purple-tipped stipitate-glandular distally. |
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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 spreading to reflexed, triangular to ovate; petals dark reddish purple, not spotted, narrowly ovate to lanceolate, slightly clawed, 1.5–3 mm, equaling sepals; filaments linear, flattened; pistils connate to 1/2 their lengths; ovary 1/2+ inferior. |
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Capsules | green to yellow and purplish tinged to dark purple, valvate. |
reddish to purple, valvate. |
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2n | = 112, 120. |
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Micranthes nelsoniana |
Micranthes hieraciifolia |
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Phenology | Flowering summer. | |||||||||||||||||
Habitat | Wet, mossy tundra, streamsides, ledges, crevices | |||||||||||||||||
Elevation | 0-2000 m (0-6600 ft) | |||||||||||||||||
Distribution |
AK; OR; WA; AB; BC; NT; NU; YT; Europe (ne Russia); Asia
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AK; MT; BC; NT; NU; YT; Greenland; Europe; 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.) |
In British Columbia, Micranthes hieraciifolia is disjunct between the far north and the Okanagan-Thompson Plateau in the south (S. A. Harris 2003). (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. 66. | ||||||||||||||||
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes | ||||||||||||||||
Sibling taxa | ||||||||||||||||||
Subordinate taxa | ||||||||||||||||||
Synonyms | Saxifraga nelsoniana, Saxifraga punctata subsp. nelsoniana, Saxifraga punctata var. nelsoniana | Saxifraga hieraciifolia, Saxifraga hieraciifolia var. angusticapsula, Saxifraga hieraciifolia var. rufopilosa | ||||||||||||||||
Name authority | (D. Don) Small: in N. L. Britton et al., N. Amer. Fl. 22: 147. 1905 , | (Waldstein & Kitaibel ex Willdenow) Haworth: Saxifrag. Enum., 45. 1821 (as hieracifolia) , | ||||||||||||||||
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