Micranthes hitchcockiana |
Micranthes pensylvanica |
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Hitchcock's saxifrage, Saddle Mountain saxifrage |
eastern swamp saxifrage, marsh, marsh saxifrage, Pennsylvania, Pennsylvania saxifrage, swamp saxifrage, swamp small-flower-saxifrage |
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Habit | Plants solitary or in clumps, short-rhizomatous. | Plants solitary or in groups, with thick, fleshy rhizomes. |
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 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 | 70+-flowered, open, lax, flat-topped thyrses, 15–35 cm, tangled, yellow-tipped stipitate-glandular. |
(30–)50+-flowered, open, often lax thyrses, 25–125 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 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 | greenish to reddish purple, folliclelike. |
green, folliclelike. |
2n | = 76. |
= 56, 84, 112. |
Micranthes hitchcockiana |
Micranthes pensylvanica |
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Phenology | Flowering late spring–summer. | Flowering spring. |
Habitat | Wet rocks and ledges on mountain-top balds | Marshy meadows, mucky seepages in woods, swamp forests, montane bogs and seeps |
Elevation | 600-1100 m (2000-3600 ft) | 100-1400 m (300-4600 ft) |
Distribution |
OR
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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 | 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.) |
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. 70. | FNA vol. 8, p. 67. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Saxifraga hitchcockiana | 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 | (Elvander) Brouillet & Gornall: Novon 18: 138. 2008 , | (Linnaeus) Haworth: Saxifrag. Enum., 45. (1821) |
Web links |
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