EUPHORBIA, SECTION TITHYMALUS. 129 
KE. BRACHYCERA Engelm. Mex. Bound. 2!: 192. 1859; Boiss. 
DC. Prod. 157: 147. 1862. HH. chamaesula Coulter, 
Contr. Nat. Herb. 1: 48. 1890. 2. campestris Coulter, 
]. c.; Heller, Bot. Expl. South. Tex. 60. 1895. 
Stems few, 2 to 3.5 dm. high, woody below, leaf scars 
not prominent, a few branches below the umbel; rays 3 or 
sometimes 5, 15 to 20 mm. long, many times dichotomous ; 
stem leaves oblong linear, acute or obtuse, sessile or short 
petioled, 8 to 15 mm. long, 2 to 3 mm. wide; umbel leaves 
ovate to lanceolate, 4to 10 mm. wide; floral leaves rhombic 
or triangular ovate, broadly cuneate to subcordate at base, 
obtuse, mucronate, 5 to 8 mm. in diameter; involucre 1.5 
to 2 mm. high, 1 mm. wide, or more, hirsute inside and 
on the lobes; glands triangular ovate, crenulate between 
the short horns; capsule 3.5 to 4 mm. long and wide, 
depressed ovoid; cocci rounded; sulci shallow; seeds 
ovoid oblong, covered with rather large, distinct pits, ash 
colored, darker in the pits, 1.8 to 2 mm. long, 1.3 to 1.4 
mm. wide; caruncle large, broad conical, nearly one-half 
as long as the seed. — Eastern New Mexico and western 
Texas and in Mexico. The Texas specimens are close to 
E. chamaesula and EF’. montana. — Plate 46. 
Specimens examined from New Mexico (Wright, Dofiana, 1821, 
1851-2); Texas (Nealley, Chanates Mts., 575 = 441, 1889, pubescent, 
Limpia Cafion, 614 = 440, 1889; Reverchon, Upper Llano, 1593, 140, 1885; 
Heller, Kerrville, 1599, 1894) ; Mexico (Pringle, Potrero Peak, Chihuahua, 
1143, 1886). 
E. CHAMAESULA Boiss. Cent. Euph. 38. 1860; Boiss. DC. 
Prod. 157: 162. 1862. H. esulaeformis Engelm. Mex. 
Bound. 2!:192. 1859. H. campestris esulaeformis 
Boiss. DC. Prod. 157: 147. 1862. (in part). H. cam- 
pestris Engelm. Euph. Wheeler Exped. 248. 1878. 
Stems one to several, 4 to 5 dm. high, rather thick, 
leaf scars not prominent on the woody base, glaucous, 
smooth, a number of fruiting or barren branches above 
the middle of the stem; umbel 3 to 6-rayed; rays 4 to 5 
cm. long, 3 or 4 times branched; stem leaves spreading, 
9 45 
