Micranthes hitchcockiana |
Micranthes oregana |
Micranthes gormanii |
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Hitchcock's saxifrage, Saddle Mountain saxifrage |
bog saxifrage, Oregon or bogsaxifrage, Oregon saxifrage |
Gorman's saxifrage |
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Habit | Plants solitary or in clumps, short-rhizomatous. | Plants solitary or in clusters, with caudex or thick, fleshy rhizomes. | Plants in groups or, sometimes, almost mat-forming, rhizomatous. |
Leaves | 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. |
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, 5–7.5 cm; blade ovate to elliptic, 3–4 cm, fleshy, base attenuate, margins shallowly crenate-serrate, sparsely ciliate, surfaces tangled, reddish brown-hairy. |
Inflorescences | 70+-flowered, open, lax, flat-topped thyrses, 15–35 cm, tangled, yellow-tipped stipitate-glandular. |
(30–)50+-flowered, open to ± crowded, conic to cylindric thyrses, 25–125 cm, hairy proximally, yellow- to pink-tipped stipitate-glandular distally. |
(10–)30+-flowered, open, lax, strongly divaricately branched, conic thyrses, 8–30 cm, purple-tipped stipitate-glandular; (bracts glabrous, proximal marginally ciliate). |
Flowers | 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. |
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 ascending, ovate to oblong, (margins eciliate, surfaces glabrous); petals white, not spotted, obovate to ± round, clawed, ca. 2 mm, ca. 1.5 times as long as sepals; filaments linear, flattened; pistils distinct almost to base; ovary nearly 1/3 inferior, (to 1/3 adnate to hypanthium). |
Capsules | greenish to reddish purple, folliclelike. |
green to reddish purple, folliclelike. |
greenish to reddish purple, folliclelike. |
2n | = 76. |
= 38, 76. |
= 20, 38, 40. |
Micranthes hitchcockiana |
Micranthes oregana |
Micranthes gormanii |
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Phenology | Flowering late spring–summer. | Flowering early spring–summer. | Flowering spring. |
Habitat | Wet rocks and ledges on mountain-top balds | Bogs, marshes | Wet, rocky ledges and slopes |
Elevation | 600-1100 m (2000-3600 ft) | 100-2500 m (300-8200 ft) | 0-1000 m (0-3300 ft) |
Distribution |
OR
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CA; CO; ID; MT; NV; OR; WA; AB
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OR; WA
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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.) |
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. 70. | FNA vol. 8, p. 67. | FNA vol. 8, p. 62. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | |||
Synonyms | Saxifraga hitchcockiana | Saxifraga oregana, Saxifraga montanensis, Saxifraga oregana var. montanensis | Saxifraga gormanii, Saxifraga occidentalis var. dentata |
Name authority | (Elvander) Brouillet & Gornall: Novon 18: 138. 2008 , | (Howell) Small: in N. L. Britton et al., N. Amer. Fl. 22: 138. 1905 , | (Suksdorf) Brouillet & Gornall: J. Bot. Res. Inst. Texas 1: 1020. 2007 , |
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