EUPHORBIA, SECTION TITHYMALUS. 93 
||| Glands semilunate, the horns longer than the teeth, if 
any, between them, lobes triangular ovate. 
t { Seeds large, broadly truncate at the base, capsules 
5 mm. long. E. chamaesula. 
{7 Seeds and capsules smaller, seeds not prominently 
truncate. 
§ Inflorescence compact, internodes not much longer 
than the floral leaves, stem leaves lance-linear; 
Mexican. E.. campestris, 
§§ Inflorescence open, internodes longer than the 
leaves, stem leaves ovate to oblong. 
Low, robust; northern, E. robusta. 
Slender; southern. 
Stem leaves ovate to oblong. E. montana. 
Stem leaves small, lanceolate. EZ. odontadenia. 
Stem leaves oblong to linear. E. brachycera. 
SYNOPSIS OF NORTH AMERICAN SPECIES. 
A. Decussatae. Stem leaves decussate, entire; glands 4, bicornute, the 
horns spatulate; lobes parallel veined; stamens and bracts numer- 
ous; seeds carunculate. 
EK. Larayris Linn. Sp. Plant. 457. 1753; Boiss. DC. 
Prod. 157: 99. 1862; Wats. Bot. Calif. 2:76. 1880; 
Gray, Man. 406. 1848; Brit. & Brown, Il. Flora 
2:377. 1897; Greene, Man. Bay Region 80. 1894; 
Pursh, Flora 2:607. 1814. #. decussata Salisb. 
Prod. 389. 1796. (fide Index Kewensis). Tithymalus 
Lathyris Hill, Hort. Kew. 172(3). 1768; Kl. & Gar. 
- Tricoc. 95.1860. Galarhoeus decussatus 8. F. Gray, 
Nat. Arr. Brit. Pl. 2: 256.1821. G. Lathyris Haw. 
Pl. Suc. 143. 1812. #. spongiosa Ledeb. ex Schrank 
in Syll. Ratisb. 1: 214. 1824. (fide Index Kewensis). 
Epurga Lathyris Fourr. Ann. Soc. Linn. Lyon n. 
s. 17: 150. 1869. (fide Index Kewensis). Hpurga 
pensylvanica Gandoger, Fl. Eur. 20:70. 1890. Hu- 
phorbion lathyrum Saint Lager, Ann. Soc. Bot. Lyon 
7:126. 1880.—Reichenb. Ic. Fl. Germ. f. 4783; 
Brit. & Brown, Ill. Flora f. 2327; Pammel, Seed- 
coats pl. 12. f. 18d; Millspaugh, Medic. Plants 
pl. 150. 
Annual; stem single, erect, smooth, glaucous, 4 to 10 
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