Stems 1—3½ inches tall, tufted, smooth or finely glandular-hairy. Leaves reniform in outline, ⅛—½ an inch broad, thick, mainly 3-lobed, those of the stem sometimes entire, short petioled or sessile; basal leaves on slender petioles an inch or more long. Flowers small, base of the calyx and sepals ⅛ of an inch long; petals oblong, or broadly wedge-shaped, white, slightly larger than the sepals. An inconspicuous little plant growing on wet rocks and beside alpine brooks at high altitudes throughout the region; flowering during midsummer. [Sidenote: =Saxifraga cernua= L. _Nodding Bulbous Saxifrage._] Stems 3—8 inches tall, leafy, somewhat glandular-hairy, growing in groups. Leaves reniform in outline ⅓—1 inch wide; the basal and lower stem-leaves long-petioled prominently, 3—7 lobed, the lobes linear to triangular-lanceolate; the upper stem leaves, 3—5-lobed. Flowers represented by clusters of rosy bulblets, except a single terminal one with the base of the calyx and sepals ¼ of an inch long, and wedge-shaped, the clawless white petals nearly half an inch long. A rather striking alpine plant growing on wet rocks at Lake Louise and Moraine Lake; flowering in midsummer. [Sidenote: =Muscaria adscendens= (L.) Small. _Muscaria._] Somewhat glandular-hairy, 1—4 inches tall. Leaves ⅛—¼ of an inch long, mainly wedge-shaped or spatulate, 3-toothed or those of the stem entire. Flower-stalks sparingly branched above or throughout; sepals ovate or oblong-ovate ¹/₁₆—⅛ of an inch long, acute or obtuse; petals white, wedge-shaped to oblong wedge-shaped, a third longer than the sepals, the claws slender or stout. An alpine species with rosettes of basal leaves, not infrequent throughout the Rockies, along streams, and on shaded rocks; flowering in midsummer. [Illustration: Muscaria cæspitosa (L.) Haw. (½ Nat.) Tufted Saxifrage.] [Illustration: Micranthes rhomboidea (Greene) Small. (⅓ Nat.) Mountain Saxifrage.] [Sidenote: =Muscaria cæspitosa= (L.) Haw. _Tufted Saxifrage._] Glandular-hairy, 2—6 inches tall. Leaves crowded at the base, sometimes densely so; blades ¼—¾ of an inch long, 3-lobed at the apex, the lobes lanceolate or linear. Flower-stalks stout, 3-few-flowered, each bearing 2—3 leaves, base of the calyx ⅛ to ³/₁₆ of an inch high, turbinate at the base, sepals ovate to ovate-lanceolate, ¹/₁₆—⅛ of an inch long; petals white, narrowly obovate or oblong-ovate, ¼ of an inch or more long, rounded at the apex. An alpine species growing on moist, shaded rocks throughout the Rockies, frequent, often forming tufts of considerable size; flowering in June. [Sidenote: =Micranthes rhomboidea= (Greene) Small. _Alpine Saxifrage._]