Micranthes pensylvanica

(Linnaeus) Haworth

Saxifrag. Enum., 45. 1821,.

Common names: Pennsylvania marsh or swamp saxifrage
Basionym: Saxifraga pensylvanica Linnaeus Sp. Pl. 1: 399. 1753
Synonyms: Micranthes pensylvanica var. purpuripetala (A. M. Johnson) Bush Saxifraga forbesii A. M. Johnson Saxifraga pensylvanica var. forbesii (Vasey) Engler & Irmscher Saxifraga pensylvanica subsp. interior G. W. Burns Saxifraga pensylvanica var. purpuripetala (A. M. Johnson) Bush Saxifraga pensylvanica subsp. tenuirostrata G. W. Burns Saxifraga purpuripetala
Treatment appears in FNA Volume 8. Treatment on page 67. Mentioned on page 51.

Plants solitary or in groups, with thick, fleshy rhizomes. Leaves 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–)50+-flowered, open, often lax thyrses, 25–125 cm, purple-tipped stipitate-glandular. Flowers: 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, folliclelike. 2n = 56, 84, 112.

Phenology: Flowering spring.
Habitat: Marshy meadows, mucky seepages in woods, swamp forests, montane bogs and seeps
Elevation: 100-1400 m


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Man., Ont., Sask., Conn., Del., Ill., Ind., Iowa, Ky., Maine, Md., Mass., Mich., Minn., Mo., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., Tenn., Vt., Va., W.Va., Wis.


Purple-petalled populations of Micranthes pensylvanica have been known as Saxifraga purpuripetala and are found in Maine, New York, Pennsylvania, and Vermont.

Selected References


Lower Taxa

... more about "Micranthes pensylvanica"
Luc Brouillet +  and Patrick E. Elvander† +
(Linnaeus) Haworth +
Saxifraga pensylvanica +
Pennsylvania +, marsh +  and or swamp saxifrage +
Man. +, Ont. +, Sask. +, Conn. +, Del. +, Ill. +, Ind. +, Iowa +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mo. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Pa. +, R.I. +, Tenn. +, Vt. +, Va. +, W.Va. +  and Wis. +
100-1400 m +
Marshy meadows, mucky seepages in woods, swamp forests, montane bogs and seeps +
Flowering spring. +
Saxifrag. Enum., +
Micranthes pensylvanica var. purpuripetala +, Saxifraga forbesii +, Saxifraga pensylvanica var. forbesii +, Saxifraga pensylvanica subsp. interior +, Saxifraga pensylvanica var. purpuripetala +, Saxifraga pensylvanica subsp. tenuirostrata +  and Saxifraga purpuripetala +
Micranthes pensylvanica +
Micranthes +
species +