Micranthes marshallii |
Micranthes hitchcockiana |
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Idaho saxifrage, Marshall's saxifrage |
Hitchcock's saxifrage, Saddle Mountain saxifrage |
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Habit | Plants in groups or sometimes mat-forming, rhizomatous. | Plants solitary or in clumps, short-rhizomatous. |
Leaves | basal; petiole flattened, 3–15 cm; blade ovate, 1–5 cm, ± fleshy, base attenuate, margins shallowly crenate-serrate (teeth ca. 2 mm), eciliate, surfaces sparsely tangled, reddish brown-hairy abaxially, glabrate 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 | 15–50+-flowered, open, lax thyrses, 20–40 cm, purple-tipped stipitate-glandular. |
70+-flowered, open, lax, flat-topped thyrses, 15–35 cm, tangled, yellow-tipped stipitate-glandular. |
Flowers | sepals reflexed, lanceolate to oblong; petals white, with 2 basal yellow spots (often faded when dried), ovate, clawed, 1.5–4.5 mm, longer than sepals; filaments strongly club-shaped, sometimes petaloid (short-clawed, equaling petals); 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. |
= 76. |
Micranthes marshallii |
Micranthes hitchcockiana |
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Phenology | Flowering spring. | Flowering late spring–summer. |
Habitat | Deeply shaded watercourses, stream banks, seeps | Wet rocks and ledges on mountain-top balds |
Elevation | 100-1000 m (300-3300 ft) | 600-1100 m (2000-3600 ft) |
Distribution |
CA; OR
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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. 63. | FNA vol. 8, p. 70. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Saxifraga marshallii | Saxifraga hitchcockiana |
Name authority | (Greene) Small: in N. L. Britton et al., N. Amer. Fl. 22: 145. 1905 , | (Elvander) Brouillet & Gornall: Novon 18: 138. 2008 , |
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