Alpine Lewisia

Oreobroma exarticulatum (St. John) Rydberg
Lewisia exarticulata St. John, Res. Stud. State Coll. Wash. 1: 59. 1929.
Perennial, with a thick fleshy root 1-2 cm. long; basal leaves fleshy, petioled, the petioles winged, 1-2 cm. long, the blade fleshy, linear-oblanceolate, obtuse, 2-3 cm. long, 1.5 cm. wide; scapes several, usually 1-flowered; bracts 2, opposite, 2-3 mm. below the flower, oblongoblanceolate, prominently veined, glandular-dentate, 2-4 mm. long; sepals orbicular, veiny, glandular-dentate; petals 8, greenish-white, 6-7 mm. long, oblanceolate; stamens 4; filaments hyaline, narrowly deltoid; stigmas 4; capsule ovoid, transparent; seeds about 24, chestnutbrown, about 1-3 mm. long.
Type locality: Panorama Point, Mount Rainier, Washington. Distribution: Mount Rainier.

Oreobroma pygmaeum (A. Gray) Howell, Erythea 1: 32. 1893
Talinum pygmaeum A. Gray, Am. Jour. Sci. II. 33: 407. 1862.
Calandrinia pygmaea A. Gray, Proc. Am. Acad. 8: 623. 1873. Not C. pygmaea F. Muell. 1859.
Calandrinia Grayi Britton, Bull. Torrey Club 17: 312. 1890.
Lewisia pygmaea B. L. Robinson, in A. Gray, Syn. Fl. N. Am. I 1 : 268. 1897.
Oreobroma Grayi Rydb. Mem. N. Y. Bot. Gard. 1: 137. 1900.
Subacaulescent perennial, with a fusiform root up to 1 cm. thick; basal leaves numerous, linear or linear-oblanceolate, 3-7 cm. long, 1-3 mm. wide; scape 1-3-flowered, 2-6 cm. high; bracteate at or below the middle; bracts lance-linear, connate at the base, 5-10 mm. long; sepals suborbicular, rounded or truncate and glandular-dentate at the apex, 4—5 mm. long, strongly veined; petals 6-8, pink or white, 8-10 mm. long, unequal; stamens 5-8, stigmas 3-5; capsule ovoid, 4-5 mm. long; seeds 15-20, black, ovate, shining, muriculate, 1 mm. long.
Type locality: Bridger's Pass, Wyoming.
Distribution: Rocky crests, Montana to Colorado, California, and Washington.

Oreobroma aridorum (Bartlett) A. Heller, Muhlenbergia 6: 83 1910.
Lewisia pygmaca aridorum Bartlett, Bot. Gaz. 44: 303. 1907.
Subacaulescent perennial, with a fusiform root ; basal leaves linear-oblanceolate, 3-6 cm. long, 2-4 mm. wide, acute; scape 1-5-flowered, 3-5 cm. high; bracteate above them iddle; bracts linear or oblong, connate at the base, about 5 mm. long, glandular-dentate; sepals 5 mm. long, suborbicular, rounded at the apex, strongly reticulate-veined, glandular-dentate at the apex, the glands black or dark-brown, distinctly stipitate; petals white, narrowly oblong, ..landular-dentate at the apex; capsule ovoid, dark-brown, 4.5 mm. long; seeds nearly black, shining, fully 1 mm. long.
Tvi-k locality: Bare places in the meadows, Mount Paddo Miami Adams i. Washington. Distribution: Known only from the type locality.