Micranthes odontoloma |
Micranthes aprica |
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brook saxifrage, stream saxifrage, streambank saxifrage |
Sierra saxifrage |
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Habit | Plants solitary or sometimes grouped, rhizomatous. | Plants solitary, in clumps, or sometimes mat-forming, with bulbils on caudices, or rhizomatous. |
Leaves | 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. |
basal; petiole flattened, 0.5–2 cm; blade obovate to elliptic, 1.5–4 cm, fleshy, base attenuate, margins entire or apically denticulate, eciliate, surfaces glabrous or sparsely hairy. |
Inflorescences | 10–30+-flowered, open, lax, flat-topped thyrses, 20–65(–85) cm, glabrous proximally, purple-tipped subsessile-glandular distally. |
5+-flowered, densely crowded in 1–3 glomerulate, often flat-topped thyrses, 3.5–15(–20) cm, sparsely purple-tipped stipitate-glandular. |
Flowers | 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. |
sepals ascending to spreading, ovate; petals white, not spotted, elliptic to linear, clawed, 1.8–3 mm, slightly longer than sepals; filaments linear, flattened; pistils connate to 1/2 their lengths; ovary inferior, appearing more superior in fruit. |
Capsules | green to purple, ± folliclelike. |
purple, folliclelike. |
2n | = 24, 48. |
= 20. |
Micranthes odontoloma |
Micranthes aprica |
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Phenology | Flowering summer–early autumn. | Flowering summer. |
Habitat | Wet meadows and stream banks | Rocky alpine and snowbed meadows |
Elevation | 1500-4000 m (4900-13100 ft) | 1700-4500 m (5600-14800 ft) |
Distribution |
AZ; CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC
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CA; NV; OR
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Discussion | Specimens of Micranthes aprica from the Klamath region of California and Oregon are unusually robust, occur at unusually low elevations, and have usually pollen-sterile flowers (P. E. Elvander 1984). In the Steens Mountains of southwestern Oregon, specimens that are morphologically similar to M. rhomboidea from some Utah locations can be found. Although tentatively relegated to M. aprica, these populations need thorough study. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 8, p. 56. | FNA vol. 8, p. 69. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Saxifraga odontoloma | Saxifraga aprica |
Name authority | (Piper) A. Heller: Muhlenbergia 8: 60. 1912 , | (Greene) Small: in N. L. Britton et al., N. Amer. Fl. 22: 135. (1905) |
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