Micranthes nelsoniana |
Micranthes oregana |
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dotted saxifrage, heartleaf saxifrage, Nelson's saxifrage, saxifrage |
bog saxifrage, Oregon or bogsaxifrage, Oregon saxifrage |
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Habit | Plants solitary or tufted, with bulbils on branched caudices, rhizomatous. | Plants solitary or in clusters, with caudex or thick, fleshy rhizomes. | ||||||||||||||||
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 indistinct, flattened, 3–10 cm; blade linear to oblanceolate, 6–25 cm, fleshy, base cuneate, margins serrulate to denticulate, ciliate, surfaces glabrous or sparsely hairy. |
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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–)50+-flowered, open to ± crowded, conic to cylindric thyrses, 25–125 cm, hairy proximally, yellow- to pink-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 reflexed, ovate to triangular; petals white, not spotted, broadly elliptic to obovate and 2 times as long as sepals, sometimes oblanceolate and equaling or shorter than sepals, clawed, 2–5 mm; filaments linear, flattened; pistils connate to 1/2 their lengths; ovary 1/2+ inferior, often appearing superior in fruit. |
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Capsules | green to yellow and purplish tinged to dark purple, valvate. |
green to reddish purple, folliclelike. |
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2n | = 38, 76. |
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Micranthes nelsoniana |
Micranthes oregana |
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Phenology | Flowering early spring–summer. | |||||||||||||||||
Habitat | Bogs, marshes | |||||||||||||||||
Elevation | 100-2500 m (300-8200 ft) | |||||||||||||||||
Distribution |
AK; OR; WA; AB; BC; NT; NU; YT; Europe (ne Russia); Asia
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CA; CO; ID; MT; NV; OR; WA; AB
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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 both habitat and morphology, Micranthes oregana is similar to M. pensylvanica. A thorough investigation of the two species, especially the populations in Colorado that are disjunct from those in Montana, is needed to clarify relationships. The name Saxifraga integrifolia was misapplied to M. oregana by early California authors. (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. 67. | ||||||||||||||||
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes | ||||||||||||||||
Sibling taxa | ||||||||||||||||||
Subordinate taxa | ||||||||||||||||||
Synonyms | Saxifraga nelsoniana, Saxifraga punctata subsp. nelsoniana, Saxifraga punctata var. nelsoniana | Saxifraga oregana, Saxifraga montanensis, Saxifraga oregana var. montanensis | ||||||||||||||||
Name authority | (D. Don) Small: in N. L. Britton et al., N. Amer. Fl. 22: 147. 1905 , | (Howell) Small: in N. L. Britton et al., N. Amer. Fl. 22: 138. 1905 , | ||||||||||||||||
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