328 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Fruit less than 20 mm. long: plant lower and less 
robust; flowers whitish or very pale pink; stems 
rather densely pubescent: bracts narrowly lanceo- 
late 2 - Meek » T. wootonii. 
1. Tripterocalyx crux-maltae (Kellogg) Standley. 
Abronia criux-maltae Kellogg, Proce. Cal. Aend, 2:71. 1863. 
This species has probably more handsome flowers than any other species of 
Tripterocalyx or Abronia. 
Specimens examined: 
NEVADA: Wadsworth, 1904, Kennedy S71; Truckee Pass, Virginia Moun- 
tains, 1908, Kennedy 784; 1 mile west of Reno, 1901, Heizer 809: Reno, 
ASSS, Sonne 488: Carson City, SOT, Jones; Gillis, 1883, Shockley 349; 
Empire City, 1882, Jones 4088: Pah Ute Mountains, 1869, Watson 967. 
CALIFORNIA: Sierra Nevada Mountains, 1875, Lemmon, 
2. Tripterocalyx micranthus (Torr.) Hook. Kew Journ. Bot. 5: 261. 1852. 
Abronia micrantha Torr, in Frem. First Rep. 92, 1843, 
This can be easily distinguished from 1. cyclopterus, with whieh it has often 
been confused, by its smaller, greenish-white flowers, smaller bracts, and spon- 
gious fruit, which has no vertical ribs. 
Specimens cramined, in part: 
MONTANA: Glendive, 1892, Sandberg, Heller & MacDougal: Yankee Jim 
Canyon, 1899, Blankinship 424: Beaver Head Couuty, ISSS, Tuceedy 
121, 
WYOMING: Marquette, 1898, Rose 128; Fort Steele, 1901, Tweedy 4614; 
Washington's Ranch, Sweetwater County, 1901, Merrill & Wileor 795: 
Evanston, 1897, A. Nelson 4123: Willow Creek, 1894, A. Nelson 8742: 
Laramie, 1897, EH. Nelson 3414: Dunn's Ranch, Albany County, 1900, 
A. Nelson 7624: Alecova, 1901, Goodding 155. 
Uran: Price, 1898, Susan G. Stokes. 
CoLrorapo: Near Grand Junetion, 1900, 8S. G. Stokes; valley of the Arkan- 
sas, Wheeler Survey 815; Denver, 1885, Letterman ; Platte Valley below 
Greeley, 1881, Ward; Telluride, 1894, Tweedy 129; Grand Junction, 
IS94, Jones 3476; Fort Collins, 1892, Crandall; headwaters of Sangre 
de Cristo Creek, 1900, Rydberg & Vreeland 6811: Canyon City, 1871, 
Brandegee 100. 
NEVADA: Muddy Valley, Lincoln County, 1906, Kennedy & Goodding 1700, 
ARIZONA: Beaver Dam Creek, 1902, Goodding. 
New Mexico: Albuquerque, 1853, Bigelow; opposite San Juan, Rio Arriba 
County, 1897, Heller 3766. 
KANSAS: Syracuse, 1893, C. H. Thompson. 
NEBRASKA; Cheyenne County, 1891, Rydberg 339, 
5+. Tripterocalyx pedunculatus (Jones) Standley. 
Abronia micrantha pedunculata Jones, Proc, Cal. Acad, [L. 5: 716. 1895, 
Abronia pedunculata Rydb. Bull. Torr. Club 29: G86. 1902. 
Specimens examined: 
Utan: St, George, 1894, Jones 5101, type; St. George, 1894, Jones 5189: 
Green River, 1895, Jones; Green River, 1894, Jones D482m; La Verken, 
1894, Jones 5188; Thompsons Springs, 1892, Fastiwood. 
ARIZONA: Twenty miles above Pierces Ferry, 1894, Jones 5077a, 
