Micranthes oregana |
Micranthes odontoloma |
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bog saxifrage, Oregon or bogsaxifrage, Oregon saxifrage |
brook saxifrage, stream saxifrage, streambank saxifrage |
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Habit | Plants solitary or in clusters, with caudex or thick, fleshy rhizomes. | Plants solitary or sometimes grouped, rhizomatous. |
Leaves | 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. |
basal; petiole rounded, 2–30 cm; blade round, 7–40 cm, thin to slightly fleshy, base cordate to truncate, margins regularly dentate, eciliate, surfaces sparsely brownish hairy abaxially, glabrous adaxially. |
Inflorescences | (30–)50+-flowered, open to ± crowded, conic to cylindric thyrses, 25–125 cm, hairy proximally, yellow- to pink-tipped stipitate-glandular distally. |
10–30+-flowered, open, lax, flat-topped thyrses, 20–65(–85) cm, glabrous proximally, purple-tipped subsessile-glandular distally. |
Flowers | 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. |
sepals reflexed, ovate to elliptic; petals white, each with 2 basal yellow spots, round to broadly elliptic, clawed, 3–4.5 mm, longer than sepals; filaments strongly club-shaped, (to 6 mm); pistils connate ca. 1/2 their lengths; ovary superior. |
Capsules | green to reddish purple, folliclelike. |
green to purple, ± folliclelike. |
2n | = 38, 76. |
= 24, 48. |
Micranthes oregana |
Micranthes odontoloma |
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Phenology | Flowering early spring–summer. | Flowering summer–early autumn. |
Habitat | Bogs, marshes | Wet meadows and stream banks |
Elevation | 100-2500 m (300-8200 ft) | 1500-4000 m (4900-13100 ft) |
Distribution |
CA; CO; ID; MT; NV; OR; WA; AB
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AZ; CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC
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Discussion | 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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Source | FNA vol. 8, p. 67. | FNA vol. 8, p. 56. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Saxifraga oregana, Saxifraga montanensis, Saxifraga oregana var. montanensis | Saxifraga odontoloma |
Name authority | (Howell) Small: in N. L. Britton et al., N. Amer. Fl. 22: 138. 1905 , | (Piper) A. Heller: Muhlenbergia 8: 60. 1912 , |
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