Micranthes hitchcockiana |
Micranthes unalaschcensis |
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Hitchcock's saxifrage, Saddle Mountain saxifrage |
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Habit | Plants solitary or in clumps, short-rhizomatous. | Plants solitary or tufted, with bulbils on caudices or 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 flattened, 1–2 cm; blade broadly obovate to round, 1–3.5 cm, ± fleshy, base cuneate, margins distally toothed, sparsely ciliate, surfaces glabrous. |
Inflorescences | 70+-flowered, open, lax, flat-topped thyrses, 15–35 cm, tangled, yellow-tipped stipitate-glandular. |
2–10-flowered, open thyrses, racemiform distally, sometimes solitary flowers, 3–15 cm, tangled-hairy. |
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; petals white to cream or pinkish, not spotted, elliptic to oblong, ± clawed, 3.5–5 mm, longer than sepals; filaments linear, flattened; pistils connate 1/2+ their lengths; ovary at least 1/2 inferior. |
Capsules | greenish to reddish purple, folliclelike. |
dark purple, valvate. |
2n | = 76. |
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Micranthes hitchcockiana |
Micranthes unalaschcensis |
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Phenology | Flowering late spring–summer. | Flowering summer. |
Habitat | Wet rocks and ledges on mountain-top balds | Tundra, flushes, stream banks, slopes |
Elevation | 600-1100 m (2000-3600 ft) | 0-600 m (0-2000 ft) |
Distribution |
OR
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AK; e Asia (Russian Far East) |
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.) |
The ovaries and capsules of Micranthes unalaschensis are ovoid, thicker and plumper than those of M. calycina and M. razshivinii, which are conic (E. Hultén 1968). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 8, p. 70. | FNA vol. 8, p. 60. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Saxifraga hitchcockiana | Saxifraga unalaschensis, Saxifraga calycina subsp. unalaschensis, Saxifraga davurica var. unalaschensis |
Name authority | (Elvander) Brouillet & Gornall: Novon 18: 138. 2008 , | (Sternberg) Gornall & H. Ohba: J. Bot. Res. Inst. Texas 1: 1022. (2007) |
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