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..
Robertsonia micranthidifolia Haw. Syn. Pl. Succ.
Scape rather slender, more or less viscid, 1°-3° high, bracted above. Leaves oblanceo-late or oval, sometimes 1° long, obtuse at the apex, tapering downward into a long margined petiole, coarsely and sharply dentate; panicle loose, elongated; flowers white, regular, 2"-3" broad; calyx-lobes reflexed, slightly shorter than the oval or oblong obtuse petals; calyx-tube free from the ovary; filaments club-shaped; follicles lanceolate, sharp-pointed, 2"-3" long, their tips at length divergent.
Saxifraga caroliniana A. Gray, Mem. Am.
Glandular-pilose all over, scapose from a corm-like rootstock, scape 6'-18' tall. Basal leaves clustered, oblong, oval or nearly orbicular, 1'-5' long, crenate-den-tate, narrowed into margined petioles, mostly shorter than the blade and dilated at the base; inflorescence cymose-panicu-late, ample; bracts spatulate or lanceolate; flowers white, 4"-5" broad; calyx-tube adnate to the ovary, its segments ovate-oblong, reflexed, obtuse; petals ovate or oblong-ovate, obtuse, 2-spotted, narrowed into a slender claw; filaments club-shaped; follicles oblong, 2"-3" long, united only at the base, diverging; styles subulate.
In rocky situations, mountains of Virginia and North Carolina. June-July.
Saxifraga Geum L. Sp. Pl. 401. 1753.
M. Geum Small, N. A. Flora 222: 148. 1905.
Densely glandular-pubescent, scapose, scape erect, 3'-10' high. Leaves all clustered at the base, cordate, kidney-shaped or orbicular, 1/2'-1' wide, coarsely crenate all around, borne on stout densely pubescent petioles 1'-2 1/2' long; inflorescence terminal, paniculate; bracts small, linear, obtuse; branches of the panicle ascending, 2-6-flowered; flowers 2"-3" broad; petals white, oblong or ovate-oblong, with a yellow spot at the base and several smaller purplish spots at the middle; calyx-lobes lanceolate or ovate-lanceolate, reflexed; capsule oblong, its beaks slightly divergent.
Newfoundland and in the mountainous parts of Europe. June-July.