Micranthes oregana |
Micranthes nudicaulis |
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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 in clusters, stoloniferous, 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, 0.5–3.5 cm, (base expanded, stipulelike); blade somewhat reniform, (± evenly lobed), 0.5–2.5 cm, ± fleshy, base cordate to truncate, margins entire, sparsely glandular-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. |
5–20-flowered, branched cymes or flat-topped thyrses, 5–16 cm, sparsely 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 reflexed or, sometimes, spreading, triangular; petals white to cream (rarely pink), not spotted, broadly elliptic to ovate, short-clawed, 4–5 mm, longer than sepals; filaments linear, flattened; pistils connate 1/2+ their lengths; ovary superior, (to 1/3 adnate to hypanthium). |
Capsules | green to reddish purple, folliclelike. |
dark purple-black, valvate. |
2n | = 38, 76. |
= 40. |
Micranthes oregana |
Micranthes nudicaulis |
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Phenology | Flowering early spring–summer. | Flowering summer. |
Habitat | Bogs, marshes | Wet flushes, stream banks |
Elevation | 100-2500 m (300-8200 ft) | 0-800 m (0-2600 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.) |
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Source | FNA vol. 8, p. 67. | FNA vol. 8, p. 59. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Saxifraga oregana, Saxifraga montanensis, Saxifraga oregana var. montanensis | Saxifraga nudicaulis |
Name authority | (Howell) Small: in N. L. Britton et al., N. Amer. Fl. 22: 138. 1905 , | (D. Don) Gornall & H. Ohba: J. Bot. Res. Inst. Texas 1: 1021. (2007) |
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