Micranthes petiolaris |
Micranthes pensylvanica |
|
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Michaux's saxifrage |
eastern swamp saxifrage, marsh, marsh saxifrage, Pennsylvania, Pennsylvania saxifrage, swamp saxifrage, swamp small-flower-saxifrage |
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Habit | Plants solitary or tufted, with bulbils on caudices. | Plants solitary or in groups, with thick, fleshy rhizomes. |
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 indistinct, flattened, 3–10 cm; blade linear or elliptic to ovate, 6–25 cm, fleshy, base attenuate, margins entire or subentire, ciliate, surfaces usually densely short-hairy, often tangled brown-hairy along proximal midveins. |
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). |
(30–)50+-flowered, open, often lax thyrses, 25–125 cm, purple-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, triangular to ovate; petals white to cream or rarely purple, not spotted, linear to narrowly elliptic, not clawed or slightly clawed, 2–3 mm, longer than sepals; filaments linear, flattened; pistils connate to 1/2 their lengths; ovary 1/2+ inferior, appearing superior in fruit. |
Capsules | green to yellow, sometimes purple tinged, valvate |
green, folliclelike. |
2n | = 56, 84, 112. |
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Micranthes petiolaris |
Micranthes pensylvanica |
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Phenology | Flowering late spring–early autumn. | Flowering spring. |
Habitat | Wet ledges, boulderfields, and rocky slopes, usually in thin soil over rock | Marshy meadows, mucky seepages in woods, swamp forests, montane bogs and seeps |
Elevation | 500-2100 m (1600-6900 ft) | 100-1400 m (300-4600 ft) |
Distribution |
GA; KY; MD; NC; SC; TN; VA; WV
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CT; DE; IA; IL; IN; KY; MA; MD; ME; MI; MN; MO; NC; NH; NJ; NY; OH; PA; RI; TN; VA; VT; WI; WV; MB; ON; SK
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Discussion | Micranthes petiolaris (Rafinesque) Brouillet & Gornall is an isonym. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Purple-petalled populations of Micranthes pensylvanica have been known as Saxifraga purpuripetala and are found in Maine, New York, Pennsylvania, and Vermont. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 8, p. 58. | FNA vol. 8, p. 67. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Hexaphoma petiolaris, Saxifraga michauxii, Saxifraga petiolaris | Saxifraga pensylvanica, M. pensylvanica var. purpuripetala, Saxifraga forbesii, Saxifraga pensylvanica var. forbesii, Saxifraga pensylvanica subsp. interior, Saxifraga pensylvanica var. purpuripetala, Saxifraga pensylvanica subsp. tenuirostrata, Saxifraga purpuripetala |
Name authority | (Rafinesque) Bush: Amer. Midl. Naturalist 11: 225. 1928 , | (Linnaeus) Haworth: Saxifrag. Enum., 45. (1821) |
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