EUPHORBIA, SECTION TITHYMALUS. 133 
sometimes pubescent; capsule depressed ovoid, smooth, 
deeply sulcate, 4 to 4.5 mm. wide and high; pedicel 4 to 5 
mm. long or longer; styles united below, deeply bifid; 
stigmas clavate; seeds ovoid, somewhat flattened at the 
lower end, covered with very shallow, circular, or irregular 
pits, sometimes almost smooth, usually white, 2.3 mm. 
long, 1.6 mm. wide, caruncle low conical. — In the Eastern 
Rocky Mountains, Colorado to Montana. Northward the 
plants are more dense, more scaly at the base and the 
leaves broader. Southward they are more slender, less 
branched, and the leaves narrow elliptical ovate, connecting 
with HL. montana. — Plate 49. 
Specimens examined from Colorado (? James, Long’s Exped.; Vasey, 
518, 1868; Parry, 438, 1862; Hall & Harbour, 509, 1862; Trelease, Ute 
Pass, Georgetown, 1886; Gurney, 1890; Mulford, Colorado Springs, 1892; 
Redfield, Colorado Springs, 7411, 1872; Parry, Clear Creek, 436, 1862, 
seeds nearly smooth; Engelmann, Idaho, 1874, Empire City, 1881; Jones, 
Colorado Springs, 32, 1878; Northrop, Pike’s Peak, 1888; Pammel, Lari- 
mer Co.; Eastwood, Steamboat; Baker, Larimer Co., 3.5 dm. high; 
Snow, 3 dm. high; Wolf, 85, 1873; Patterson, Clear Creek, 132, 1885; 
Coulter, Denver, 1873, Clear Creek, 1872); Montana (Tweedy, Living- 
ston, 1889; Blankinship, 44, 1890; Ward, Glendive, 1883); Nebraska 
(Webber, Pine Ridge, 1889; Williams, Pine Ridge, 1890; Rydberg, McCol- 
ligan Cafion, 362, 1891) ; South Dakota (Rydberg, Hot Springs, 997, 1892; 
Forwood, Black Hills, 1887); Wyoming (Nelson, Whalen Cafion, 529, 
1894; Hayden, 1860); early northern collections (Mersch, North Platte, 
1843; Nuttall; Fremont Exped., 1842). 
A pubescent form is represented by Williams, Belt Mts., 
Montana, 357, 1886; Scribner, mouth of Shield’s River, 
Montana, 250, 1883; Nelson, Pine Creek, Wyoming, 26, 
1892; Crandall, Ft. Collins, Col., 1890. 
Letterman, Colorado Springs, Col., 229, 1884; Crandall, 
Ft. Collins, 456, 1895; Schneck, Denver, Col., 1893; 
Wislizenus, between Placer, Col., and Albuquerque, N. M., 
3, 1846; Sheldon, Buena Vista, Col., 579, 1892; Coulter, 
Denver, Col., 1873; are of the more slender southern 
form. 
Var. INTERIORIS n. var. 
Not much branched below the umbel; rays 2.5 to 4 
49 
