Mountain Pseudosaxifrage

Micranthes occidentalis (S. Wats.) Small
Saxifraga occidentalis S. Wats. Proc. Am. Acad. 23 : 264. 1888.
Leaves spreading, 2-6.5 cm. long, the blades ovate to oblong or oval, dentate or crenate-dentate, abruptly narrowed and cuneate at the base, usually minutely pubescent beneath, sometimes closely so when young ; scapes 4-19 cm. tall, often purplish, copiously glandular-pubescent, very densely so above, narrowly paniculate, or somewhat corymbose at the top, the peduncles and pedicels relatively short during anthesis, somewhat elongated at maturity; sepals ovate, 1.5-2 mm. long, obtuse, occasionally sparingly ciliolate, reflexed; petals white, 2-3.5 mm. long, rounded at the apex, the blades oval to oval-ovate, rather abruptly narrowed into short claw-like bases ; filaments clavate ; follicles about 2 mm. high, purple, the short tips widely spreading.
Type locality : Rocky Mountains. Distribution : Alberta to Montana.

Micranthes lata Small, sp. nov
Leaves spreading, 3-5.5 cm. long, the blades ovate to oblong-ovate, ciliolate, crenate or crenate-dentate, finely pubescent on both sides, glabrate in age, narrowed into petioles that are usually shorter than the blades; scapes 14-23 cm. tall, glandular-pubescent especially above, paniculately branched, the peduncles and pedicels elongated ; cymules few-flowered, open; sepals ovate, about 1.5 mm. long, mainly glabrous, reflexed; petals white, orbicular or broader than long, rounded at the base with no indication of a claw; filaments clavate ; follicles 2-2.5 mm. high, purple, the stout tips spreading.
Type collected at Lytton, British Columbia, April 16, 1889, by John Macoun. Distribution : British Columbia to California.

Micranthes allenii Small, sp. nov
Leaves spreading or somewhat ascending, 1.5-7.5 cm. long, the blades typically ovate, sometimes broadly so or orbicular-ovate, occasionally oblong-ovate, crenate, sparingly lanuginous beneath, the hairs partially deciduous in age ; scapes 6-21 cm. tall, glandular-pubescent throughout but more densely so above, corymbosely paniculate, the cymules commonly few-flowered, the lower peduncles elongated in age ; sepals ovate, sometimes sparingly ciliolate, 1.5-3 mm. long, reflexed; petals white, 3-3.5 mm. long, notched at the apex, the blades oval to obovate, narrowed into broad claw-like bases ; filaments clavate ; follicles about 3 mm. high, purple, the rather long tips widely spreading.
Type collected on Goat Mountains, Washington, June 27, 1896, by O. D. Allen, no. 242. Distribution : Washington.

Micranthes saximontana (B. Nelson) Small
Saxifraga saximontana H. Nelson, Krythea 7 : 168. 1899. Saxifraga idahoensis Piper, Bull. Torrey Club 27 : 394. 1900.
Leaves spreading, 3-9 cm. long, the blades typically ovate, varying to oblong-ovate or occasionally oblong, dentate or crenate, sparingly pubescent, at least when young, commonly glabrous at maturity, except the margins, the petiole-like bases commonly about as long as the blades; scapes 9-19 cm. tall, glandular-pubescent throughout, commonly more densely so above, rather corymbosely branched, the peduncles and pedicels elongated; cymules fewflowered, lax; sepals ovate to oblong-ovate, 1.5-2 mm. long, sometimes ciliolate, reflexed; petals white, 2-3 mm. long, the blades oval to ovate or sometimes slightly broadest above the middle, rounded at the apex, narrowed into short claw-like bases; filaments clavate; follicles about 3 mm. high, the short slender tips ascending or spreading.
Type locality : Sundance, Wyoming. Distribution : Montana, Idaho and Wyoming.