Micranthes rufidula |
Micranthes hitchcockiana |
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rusty-hair saxifrage |
Hitchcock's saxifrage, Saddle Mountain saxifrage |
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Habit | Plants solitary or in groups, with bulbils on caudices, or rhizomatous. | Plants solitary or in clumps, short-rhizomatous. |
Leaves | basal; petiole flattened, 4–8 cm; blade ovate to elliptic, 1–4 cm, fleshy, base attenuate to ± truncate, margins serrate (15–30- toothed), eciliate, surfaces densely tangled, reddish brown-hairy abaxially, glabrous adaxially. |
basal; petiole often indistinct, flattened, 5–50 mm; blade elliptic to obovate, 4–12 cm, slightly fleshy, base cuneate, margins serrate to dentate, densely ciliate, surfaces densely tangled-hairy. |
Inflorescences | 15+-flowered, open, flat-topped thyrses, 5–20 cm, purple-tipped stipitate-glandular; (bracts often tangled brown-hairy). |
70+-flowered, open, lax, flat-topped thyrses, 15–35 cm, tangled, yellow-tipped stipitate-glandular. |
Flowers | sepals spreading, ovate, (often tangled brown-hairy); petals white, not spotted, ovate to elliptic, clawed, 2–4 mm, longer than sepals; filaments linear, flattened to slightly club-shaped; pistils distinct almost to base; ovary superior, (to 1/3 adnate to hypanthium). |
sepals reflexed, elliptic to ovate; petals white, not spotted, elliptic, clawed, 2–5 mm, longer than sepals; filaments linear, flattened; pistils connate to 1/2 their lengths; ovary 1/2 inferior, appearing more superior in fruit. |
Capsules | greenish to reddish purple, folliclelike. |
greenish to reddish purple, folliclelike. |
2n | = 20, 38, 56, 58. |
= 76. |
Micranthes rufidula |
Micranthes hitchcockiana |
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Phenology | Flowering late winter–summer. | Flowering late spring–summer. |
Habitat | Wet to dry, rocky ledges | Wet rocks and ledges on mountain-top balds |
Elevation | 0-3000 m (0-9800 ft) | 600-1100 m (2000-3600 ft) |
Distribution |
CA; OR; WA; BC
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OR
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Discussion | Of conservation concern. Micranthes hitchcockiana may have originated from hybridization between M. rufidula and M. oregana (P. E. Elvander 1984; W. E. Perkins 1978). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 8, p. 62. | FNA vol. 8, p. 70. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Saxifraga aequidentata, Saxifraga occidentalis subsp. rufidula, Saxifraga occidentalis var. rufidula, Saxifraga rufidula | Saxifraga hitchcockiana |
Name authority | Small: in N. L. Britton et al., N. Amer. Fl. 22: 140. (1905) | (Elvander) Brouillet & Gornall: Novon 18: 138. 2008 , |
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