Micranthes hitchcockiana |
Micranthes tischii |
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Hitchcock's saxifrage, Saddle Mountain saxifrage |
Olympic saxifrage, tisch's saxifrage |
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Habit | Plants solitary or in clumps, short-rhizomatous. | Plants solitary or in groups, with bulbils on caudices. |
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, 0.4–2 cm; blade ovate to elliptic, 0.5–2.5 cm, fleshy, base attenuate, margins serrate (7–16-toothed), ciliate, surfaces reddish brown-tomentose abaxially, glabrous or rarely glabrate adaxially. |
Inflorescences | 70+-flowered, open, lax, flat-topped thyrses, 15–35 cm, tangled, yellow-tipped stipitate-glandular. |
(3–)5–15(–18)-flowered, open, flat-topped thyrses or cymes, 2–7 cm, purple-tipped stipitate-glandular. |
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 spreading to reflexed, ovate; petals greenish, often purple-margined, not spotted, lanceolate to obovate, not clawed, 1.2–2(–2.5) mm, equaling to longer than sepals; filaments linear, flattened; pistils distinct almost to base; ovary superior, (to 1/3 adnate to hypanthium). |
Capsules | greenish to reddish purple, folliclelike. |
purplish, folliclelike. |
2n | = 76. |
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Micranthes hitchcockiana |
Micranthes tischii |
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Phenology | Flowering late spring–summer. | Flowering summer. |
Habitat | Wet rocks and ledges on mountain-top balds | Wet, cool, shaded, thin-soil ledges and rock crevices |
Elevation | 600-1100 m (2000-3600 ft) | 1300-2400 m (4300-7900 ft) |
Distribution |
OR
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WA; BC |
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.) |
Of conservation concern. Micranthes tischii is known only from the Olympic Peninsula and from inland, mountainous Vancouver Island, British Columbia (Ogilvie & Beguin 798911, V). Closely related to M. rufidula, M. tischii appears to be highly specialized for its habitat. The unusual persistent, green, not clawed (versus deciduous, white, clawed) petals readily distinguish the two species. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 8, p. 70. | FNA vol. 8, p. 63. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Saxifraga hitchcockiana | Saxifraga tischii |
Name authority | (Elvander) Brouillet & Gornall: Novon 18: 138. 2008 , | (Skelly) Brouillet & Gornall: J. Bot. Res. Inst. Texas 1: 1021. 2007 , |
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