EUPHORBIA, SECTION TITHYMALUS. 109 
1862; Coulter, Bot. West. Tex. 393. 1894. — Boiss. 
Euphorb. Icon. pl. 87. 1866. 
Entirely glabrous, stems several from the crown, slender, 
10 to 17 cm. high, branched below the 3-rayed umbel; rays 
2 to 3.5 em. long, dichotomous, or trichotomous and then 
several times dichotomous, stem leaves attenuate cuneate, 
obtuse, mucronate, crenate near the apex, 8 to 15 mm. long, 
2 to 4 mm. wide; umbel leaves similar; floral leaves more 
elliptical or obovate, somewhat shorter and wider ; involucres 
hemispherical, 1 mm. high; lobes short, bidentate; bracts 
5, short; stamens usually 5; glands almost always 5, elon- 
gated reniform; capsule depressed globose, 2.5 to 3 mm. 
wide, 2 mm. high; cocci rounded or somewhat flattened ; 
calyx distinctly discoid or triangular; styles free, spreading, 
deeply bifid, flattened, 1 mm. long; stigmas small, capitate ; 
seeds brownish black, globose lenticular, about 6 areolae to 
the length of the seed, a distinct line on the back and a 
triangular space under the caruncle, 1.5 mm. long, 1.3 mm. 
wide, 1 mm. thick; caruncle small, low conical. — South- 
ern Texas.—Near HF. Arkansana and EF. Mexicana. — 
Plate 25. 
Specimens examined (Hall, Houston, 555, 1872; Joor, 1877; Drummond, 
327, “E. Tex.,’’ 1835?; “ Hooker, Tex. 14,’ in herb. Engelmann). 
E. Hewrioscopia Linn. Sp. Plant. 459.1753; Gray, Man. 
405. 1848; Boiss. DC. Prod. 157: 136. 1862; Brit. 
& Brown, Ill. Flora 2 :379. 1897; Macoun, Cat. 426. 
1886. Tithymalus Helioscopius Hill, Hort. Kew. 172 
(3). 1768; Scop. Fl. Carn. 1:337. 1772. [2d ed.]. 
Galarhoeus helioscopius Haw. Pl. Suc. 152. 1812. 
Tithymalus serratus Gilib. Fl. Lituan. 2: 207. 1781. 
(fide Index Kewensis). Huphorbion helioscopium St. 
Lager, Ann. Soc. Bot. Lyon 7:126. 1880. See EF. 
obtusata and EH. Arkansana. — Reichenb. Ic. Flor. 
Germ. f. 4754; Brit. & Brown, Ill. Flora f. 2332; 
Pammel, Seed-coats pl. 12. f. 18a. 
Stem single, 1 to 3 dm. high, 3 to 6 mm. thick, slightly 
25 
