Micranthes petiolaris |
Micranthes hitchcockiana |
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Michaux's saxifrage |
Hitchcock's saxifrage, Saddle Mountain saxifrage |
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Habit | Plants solitary or tufted, with bulbils on caudices. | Plants solitary or in clumps, short-rhizomatous. |
Leaves | basal; petiole somewhat flattened, 2–6 cm; blade oblanceolate, 2–12 cm, thin, basecuneate to ± attenuate, margins usually 15+-toothed (teeth large, lobelike), densely long glandular-ciliate, surfaces hairy. |
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 | 30+-flowered, very open, lax thyrses, (flowers rarely replaced by bulbils), 10–40 cm, densely tangled, purple-tipped stipitate-glandular; (bracts leaflike, gradually reduced distally). |
70+-flowered, open, lax, flat-topped thyrses, 15–35 cm, tangled, yellow-tipped stipitate-glandular. |
Flowers | slightly bilaterally symmetric; sepals reflexed, oblong to elliptic; petals white, 3 with 2 basal yellow spots, 2 without spots, oblanceolate to spatulate, clawed, 3–4.5 mm, longer than sepals; filaments linear, flattened; pistils connate 1/2+ their lengths; ovary superior. |
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 | green to yellow, sometimes purple tinged, valvate |
greenish to reddish purple, folliclelike. |
2n | = 76. |
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Micranthes petiolaris |
Micranthes hitchcockiana |
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Phenology | Flowering late spring–early autumn. | Flowering late spring–summer. |
Habitat | Wet ledges, boulderfields, and rocky slopes, usually in thin soil over rock | Wet rocks and ledges on mountain-top balds |
Elevation | 500-2100 m (1600-6900 ft) | 600-1100 m (2000-3600 ft) |
Distribution |
GA; KY; MD; NC; SC; TN; VA; WV
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OR
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Discussion | Micranthes petiolaris (Rafinesque) Brouillet & Gornall is an isonym. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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.) |
Source | FNA vol. 8, p. 58. | FNA vol. 8, p. 70. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Hexaphoma petiolaris, Saxifraga michauxii, Saxifraga petiolaris | Saxifraga hitchcockiana |
Name authority | (Rafinesque) Bush: Amer. Midl. Naturalist 11: 225. 1928 , | (Elvander) Brouillet & Gornall: Novon 18: 138. 2008 , |
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