Micranthes oregana |
Micranthes texana |
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bog saxifrage, Oregon or bogsaxifrage, Oregon saxifrage |
Texas saxifrage |
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Habit | Plants solitary or in clusters, with caudex or thick, fleshy rhizomes. | Plants solitary or in clumps, with bulbils on caudices. |
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, 1–3 cm; blade broadly ovate to oblong, 1.5–3 cm, ± leathery, base ± abruptly attenuate, margins subentire to slightly crenate, eciliate, surfaces glabrate to sparsely hairy. |
Inflorescences | (30–)50+-flowered, open to ± crowded, conic to cylindric thyrses, 25–125 cm, hairy proximally, yellow- to pink-tipped stipitate-glandular distally. |
20+-flowered, branched, ± capitate thyrses, 10–15 cm, hairy, sometimes purple-tipped stipitate-glandular. |
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 erect, ovate; petals white, not spotted, ± obovate, clawed, 2–3.5 mm, ± equaling sepals; filaments linear, flattened; pistils 3+, connate to 1/2 their lengths; ovary 1/2+ inferior, appearing more superior in fruit. |
Capsules | green to reddish purple, folliclelike. |
reddish to purplish, valvate. |
2n | = 38, 76. |
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Micranthes oregana |
Micranthes texana |
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Phenology | Flowering early spring–summer. | Flowering late winter–spring. |
Habitat | Bogs, marshes | Sandy flats, rocky, open, wooded areas, granite outcrops |
Elevation | 100-2500 m (300-8200 ft) | 50-500 m (200-1600 ft) |
Distribution |
CA; CO; ID; MT; NV; OR; WA; AB
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AR; GA; KS; LA; MO; OK; TX |
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. 68. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Saxifraga oregana, Saxifraga montanensis, Saxifraga oregana var. montanensis | Saxifraga texana |
Name authority | (Howell) Small: in N. L. Britton et al., N. Amer. Fl. 22: 138. 1905 , | (Buckley) Small: Fl. S.E. U.S., 501. 1903 , |
Web links |