Micranthes oregana |
Micranthes gormanii |
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bog saxifrage, Oregon or bogsaxifrage, Oregon saxifrage |
Gorman's saxifrage |
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Habit | Plants solitary or in clusters, with caudex or thick, fleshy rhizomes. | Plants in groups or, sometimes, almost mat-forming, 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, 5–7.5 cm; blade ovate to elliptic, 3–4 cm, fleshy, base attenuate, margins shallowly crenate-serrate, sparsely ciliate, surfaces tangled, reddish brown-hairy. |
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, strongly divaricately branched, conic thyrses, 8–30 cm, purple-tipped stipitate-glandular; (bracts glabrous, proximal marginally ciliate). |
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 ascending, ovate to oblong, (margins eciliate, surfaces glabrous); petals white, not spotted, obovate to ± round, clawed, ca. 2 mm, ca. 1.5 times as long as sepals; filaments linear, flattened; pistils distinct almost to base; ovary nearly 1/3 inferior, (to 1/3 adnate to hypanthium). |
Capsules | green to reddish purple, folliclelike. |
greenish to reddish purple, folliclelike. |
2n | = 38, 76. |
= 20, 38, 40. |
Micranthes oregana |
Micranthes gormanii |
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Phenology | Flowering early spring–summer. | Flowering spring. |
Habitat | Bogs, marshes | Wet, rocky ledges and slopes |
Elevation | 100-2500 m (300-8200 ft) | 0-1000 m (0-3300 ft) |
Distribution |
CA; CO; ID; MT; NV; OR; WA; AB
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OR; WA
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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. 62. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Saxifraga oregana, Saxifraga montanensis, Saxifraga oregana var. montanensis | Saxifraga gormanii, Saxifraga occidentalis var. dentata |
Name authority | (Howell) Small: in N. L. Britton et al., N. Amer. Fl. 22: 138. 1905 , | (Suksdorf) Brouillet & Gornall: J. Bot. Res. Inst. Texas 1: 1020. 2007 , |
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