[*] Stems prostrate, in tufts, leafy; leaves opposite; calyx free from the capsule.
1. S. oppositifòlia, L. (Mountain Saxifrage.) Leaves fleshy, ovate, keeled, ciliate, imbricated on the sterile branches (1–2´´ long); flowers solitary, large; petals purple, obovate, much longer than the 5-cleft-calyx.—Rocks, Willoughby Mountain, Vt., and northward. (Eu.)
[*][*] Stems ascending; leaves alternate; calyx coherent below with the capsule.
2. S. rivulàris, L. (Alpine Brook-S.) Small, stems weak, 3–5-flowered; lower leaves rounded, 3–5-lobed, on slender petioles, the upper lanceolate; petals white, ovate.—Alpine region of the White Mts., to Lab. (Eu.)
3. S. aizoìdes, L. (Yellow Mountain-S.) Low (3–5´ high), in tufts, with few or several corymbose flowers; leaves linear-lanceolate, entire, fleshy, distantly spinulose-ciliate; petals yellow, spotted with orange, oblong.—N. Vt. to S. W. New York, N. Mich., and northward. June. (Eu.)
4. S. tricuspidàta, Retz. Stems tufted (4–8´ high), naked above; flowers corymbose, leaves oblong or spatulate, with 3 rigid sharp teeth at the summit; petals obovate-oblong, yellow.—Shore of L. Superior, and northward. (Eu.)
[*][*][*] Leaves clustered at the root; scape many-flowered, erect, clammy-pubescent.
[+] Petals all alike.
5. S. Aizòon, Jacq. Scape 5–10´ high; leaves persistent, thick, spatulate, with white cartilaginous toothed margins; calyx partly adherent; petals obovate, cream-color, often spotted at the base.—Moist rocks, Lab. to N. Vt., L. Superior, and northward. (Eu.)
6. S. Virginiénsis, Michx. (Early S.) Low (4–9´ high); leaves obovate or oval-spatulate, narrowed into a broad petiole, crenate-toothed, thickish; flowers in a clustered cyme, which is at length open and loosely panicled; lobes of the nearly free calyx erect, not half the length of the oblong obtuse (white) petals; follicles united merely at the base, divergent, purplish.—Exposed rocks and dry hillsides; N. Brunswick to Ga., and west to Minn., Ohio, and Tenn.; common, especially northward. April–June.