Micranthes oregana |
Micranthes unalaschcensis |
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bog saxifrage, Oregon or bogsaxifrage, Oregon saxifrage |
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Habit | Plants solitary or in clusters, with caudex or thick, fleshy rhizomes. | Plants solitary or tufted, with bulbils on caudices or 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 flattened, 1–2 cm; blade broadly obovate to round, 1–3.5 cm, ± fleshy, base cuneate, margins distally toothed, sparsely ciliate, surfaces glabrous. |
Inflorescences | (30–)50+-flowered, open to ± crowded, conic to cylindric thyrses, 25–125 cm, hairy proximally, yellow- to pink-tipped stipitate-glandular distally. |
2–10-flowered, open thyrses, racemiform distally, sometimes solitary flowers, 3–15 cm, tangled-hairy. |
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; petals white to cream or pinkish, not spotted, elliptic to oblong, ± clawed, 3.5–5 mm, longer than sepals; filaments linear, flattened; pistils connate 1/2+ their lengths; ovary at least 1/2 inferior. |
Capsules | green to reddish purple, folliclelike. |
dark purple, valvate. |
2n | = 38, 76. |
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Micranthes oregana |
Micranthes unalaschcensis |
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Phenology | Flowering early spring–summer. | Flowering summer. |
Habitat | Bogs, marshes | Tundra, flushes, stream banks, slopes |
Elevation | 100-2500 m (300-8200 ft) | 0-600 m (0-2000 ft) |
Distribution |
CA; CO; ID; MT; NV; OR; WA; AB
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AK; e Asia (Russian Far East) |
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.) |
The ovaries and capsules of Micranthes unalaschensis are ovoid, thicker and plumper than those of M. calycina and M. razshivinii, which are conic (E. Hultén 1968). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 8, p. 67. | FNA vol. 8, p. 60. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Saxifraga oregana, Saxifraga montanensis, Saxifraga oregana var. montanensis | Saxifraga unalaschensis, Saxifraga calycina subsp. unalaschensis, Saxifraga davurica var. unalaschensis |
Name authority | (Howell) Small: in N. L. Britton et al., N. Amer. Fl. 22: 138. 1905 , | (Sternberg) Gornall & H. Ohba: J. Bot. Res. Inst. Texas 1: 1022. (2007) |
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