Perennial low herbs, with densely tufted or matted copiously leafy caudices, sparingly leafy flower-stems, and alternate, 3-lobed or rarely 5-7-lobed leaves, the flowers solitary or few together in terminal cymes. Sepals 5, erect. Corolla white, regular, the petals relatively broad, clawless. Stamens 10; filaments subulate. Ovary about one-half inferior, the carpels united to above the middle. Follicles erect, except the sometimes slightly spreading tips, mostly included in the calyx-tube. [Latin, referring to the moss-like growth of the plants.]

About 35 species, most abundant on high mountains and in boreal regions. Type species: Saxifraga muscoides Wulf.

7 Musc ria Haw Saxifr Enum 36 1821 510

1. Muscaria Caespit˛sa (L.) Haw. Tufted Saxifrage

Fig. 2168

Saxifraga caespitosa L. Sp. Pl. 404. 1753.

Muscaria caespitosa Haw. Saxifr. Enum. 37. 1821.

Densely tufted, leaves clustered at the base, spatulate or fan-shaped, 3"-9" long, deeply 3-5-cleft or lobed into linear obtuse segments, glabrous; flowering stem erect, 2'-8' high, viscid-pubescent, at least above, linear-bracted or with several 3-lobed leaves; flowers 1-8, corymbose, 4"-7" broad, white; calyx-lobes ovate-oblong, obtuse or obtusish, much shorter than the obovate petals; capsule-tips divergent; base of the capsule adnate to the calyx.

On rocks, Quebec, Labrador and Newfoundland, west through arctic America to Alaska, south to Oregon and in the Rocky Mountains to Colorado. Also in arctic and alpine Europe and Siberia. Summer.