This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
1862. Micranthes texana Small, Fl. SE. U. S. 501. 1903.
Scape sparingly pubescent up to the inflorescence, 2'-7' high. Leaves ovate to obovate, narrowed into broad petioles, entire or shallowly toothed, 1/2'-2 1/2' long; inflorescence with the branches ending in congested cymules; flowers white, regular, 2"-3" broad; calyx-lobes erect, broadly oblong to ovate, somewhat shorter than the suborbicular or obovate petals; follicles erect or nearly so.
Saxifraga virginiensis Michx. Fl. Bor. Am. 1: 260.
1803. Micranthes virginiensis Small, Fl. SE. U. S. 501.
Scape viscid-pubescent, 4'-12' high, naked, or with a few bracts at the base of the pedicels.
Leaves obovate, or oval with a spatulate base, narrowed into a margined petiole, dentate or crenate, obtuse or acutish at the apex, l' - 3' long or longer; inflorescence cymose, at length loose and paniculate with the lower peduncles elongated; flowers white, regular, 2" - 3" broad; calyx-lobes erect, triangular or triangular-ovate, much shorter than the oblong-spatulate, obtuse petals; ovary nearly free from the calyx; carpels nearly separate, the follicles at length widely divergent.
In dry or rocky woodlands, New Brunswick to Minnesota, south to Georgia and Tennessee. Ascends to 3500 ft. in Virginia. March-May. Forms with 15 stamens occur on New York Island, and with green petals in Essex Co., Mass. Spring-saxifrage. May-flower. Sweet wilson. Everlasting.
S. pennsylvanica L. Sp. Pl. 399. 1753. Saxifraga Forbesii Vasey, Am. Entom. & Bot.
Scape stout, terete, viscid-pubescent, 1°-3 1/2° high, bracted at the inflorescence. Leaves large, oval, ovate, obovate or ob-lanceolate, pubescent or glabrate, 4'-10' long, 1 1/2' - 3' wide, obtuse at the apex, narrowed at the base into a broad petiole, the margins denticulate or repand; cymes in an elongated open panicle; flowers greenish, regular, 1 1/2"-2 1/2" broad; calyx-tube nearly free from the ovary, its lobes ovate, ob-tusish, reflexed, one-half shorter than the lanceolate or linear-lanceolate petals; filaments subulate or filiform; follicles ovoid, their tips divergent when mature.