EUPHORBIA, SECTION TITHYMALUS. 113 
1898. H. commutata Coulter, Contrib. Nat. Herb. 
1:48. 1890. ZL. tetrapora Heller, Bot. Explor. South. 
Tex. 61. 1895. 
Many stems from the crown, a few branches below the 
umbel, 15 to 25cm. high, smooth; rays 3, 3 to 5 cm. long, 
many times dichotomous with long internodes; stem leaves 
spatulate, obtuse or retuse, petioled, 6 to 15 mm. long, 3 
to 5 mm. wide; umbel leaves oblong, almost sessile; floral 
leaves orbicular ovate, subpandurate, unequal, obtuse, mu- 
cronate, broad cuneate to truncate at base; involucre about 
1 mm. long; lobes incurved, ovate, truncate, ciliate; glands 
elliptical, about twice as wide as long, horns as long as the 
body of the gland; fifth gland similar to the lobes but 
shorter; bracts filiform, a few hairs at the tip; stamens 
about 10; capsule depressed globose, 2.5 mm. high, 3mm. 
wide; cocci flattened, smooth; styles slightly united at 
the base; stigmas clavate, recurved; seeds ovoid, white, 
inner faces flattened, an indistinct angle on the back, 1.4 
to 1.6 mm. long, 1 to 1.2 mm. wide, almost as thick; 
caruncle thin but raised into a cone, bilobed. — Southern 
Texas. — Plate 29. 
Specimens examined (Heller, Corpus Christi, 1509, 1894; Nealley, 
Brazos Santiago, 71442, 1889). 
++ ++ ++ Capsular angles decidedly obtuse; seeds marked with pits, 
some of which are in rows. 
= Capsule bicrested on the back of each coccus. 
E. Pertus Linn. Sp. Plant. 456. 1753; Boiss. DC. Prod. 
157: 141. 1862; Pursh, Flor. Amer. 2: 606. 1814; 
Gray, Man. 405. 1848. (in part); Macoun, Cat. 426. 
1886; Greene, Man. Bay Region 80. 1894; Brit. & 
Brown, Ill. Flora 2:379. 1897. Tithymalus Peplus 
Hill, Hort. Kew. 172 (3). 1768; Gaertner, Fruct. 
2:115.1791. T. rotundifolius Lam. Fl. Fr. 3: 100. 
1778. (fide Index Kewensis). Hsula Peplus Haw. Pl. 
Suc. 158. 1812. H#. minima Haw.1.c. #. rotundifolia 
S. F. Gray, Nat. Arr. Brit. Plants 2:257. 1821. 
8 29 
