EUPHORBIA, SECTION TITIHYMALUS. 101 
S.C. & Georgia 2:658. 1824.(?). Pythius obtusata 
Rafin. Fl. Tell. 4: 116. 1836. (fide Index Kewensis)- 
E. platyphylla Gray, Man. 405. 1848. (in part). 
Tithymalus obtusatus Kl. & Gar. Tricoc. 69. 1860. Z. 
dictyosperma Ward, Flora Washington 110. 1881. — 
Brit. & Brown, Ill. Flora f. 2329. Pammel, Seed- 
coats pl. 12. f. 17. 
Stem erect, single, branched above, 2 to 5 dm. high; 
rays 3, rarely 5, 3 to 7 cm. long, several times dichoto- 
mously branched, or the first time trichotomously; stem 
leaves spatulate oblong, obtuse, subcordate, clasping, ses- 
sile, serrulate with ascending teeth, thin, 6 to 11 mm. wide, 
2 to 5 em. long; umbel leaves ovate oblong; floral leaves 
cordate ovate, longer than wide, 1 to 2.5 cm. long, 8 to 
16 mm. wide; involucre about 1 mm. high, smooth; lobes 
short, retuse or 2 to 3 dentate, one-nerved; glands trans- 
versely oblong, usually reddish, sometimes bright scarlet ; 
sinus wide and shallow; bracts 5, small and setiform; 
stamens 5 to 10; capsule depressed globose, 3 mm. high, 
4 mm. wide, trisuleate, covered all over with short cylin- 
drical warts; styles free, 1.5 mm. long, slender, cleft one- 
third of their length; stigmas nearly capitate; seeds lentic- 
ular, black-brown, not so shining as in the last species, 1.7 
to 2 mm. long, 1.5 to 1.8 mm. wide, 1.2 to 1.8 mm. thick ; 
caruncle thin, flat. — Usually in damp woods and along 
streams, from eastern Iowa to northeastern Texas and east 
to Pennsylvania and North Carolina. — Plate 17. 
Specimens examined from North Carolina (Canby, Wilmington, 1867; 
Curtis; Ashe, Chapel Hill, 1897); Missouri (Hasse, Jefferson Co., 1887; 
Engelmann, St. Louis, 1867); Ohio (Lloyd, Cincinnati, 1884; Aiken, Col- 
lege Hill, 7662, 1898; Rippos, Toledo); Illinois (Engelmann, American 
Bottoms, 1834, 1888, 1863; Mead, Warsaw, 1843; Vasey, Morris; Bebb, 
Fountaindale; Eggert, St. Clair, 1877); Arkansas (Engelmann, 1134, 
1835}; Kentucky (Short, Lexington, 1835) ; District of Columbia (Vasey, 
1883; Rusby, 1890; Ward, Washington, 1879); Virginia (Pursh, Staun- 
ton; Britton & Small, Norfolk Co., 1893); West Virginia (Mertz, Wheel- 
ing, 1878); Maryland (Knowlton, 1885); Texas (Reverchon, Dallas, 
1874, not mature but with the large capsules of this species); lowa 
(Burgess, Carbon, 1878, No. 708b of Arthur’s Catalogue). 
17 
