iis. v 
EUPHORBIA, SECTION TITHYMALUS. 131 
Var. SUBDENTATA (Engelm.) n. comb. J. esulaeformis 
subdentata Engelm. Mex. Bound. 21:192. 1859. 
Leaves, especially the upper, prominently dentate or ser- 
rate. — Northern Mexico, and may be found in Arizona. — 
Plate 47. 
Specimens examined (Hartman, San Diego, Chihuahua, 669, 1891; 
Smith, San Luis Mts.; Parry, San Francisco Spring, 1852. 
KE. cAMPESTRIS Cham. & Schlecht. Linnaea 5:84. 1830; 
Boiss. DC. Prod. 15?:146. 1862. H. esulaeformis 
Schauer, Linnaea 20:729. 1847. Tithymalus esulae- 
formis Kl. & Gar. Tricoc. 84. 1860. TJ. campester 
Kl. & Gar. 1. c. 86. — Millspaugh, Bot. Gaz. 25 : 25. 
1898. ff. 
Stems woody, branching in the lower part, 2 to 4 dm. 
high, rather slender and wiry, glaucous, reddish, the 
lower part covered with the prominent leaf scars; umbel 
5-rayed; rays 1 to 1.5 cm. long, several times short dicho- 
_ tomous; leaves crowded, usually ascending, linear to 
oblanceolate, acute, mucronate, entire, some subpetioled, 
those on the sterile branches smaller and narrower; umbel 
leaves obovate to ovate, acute; floral leaves nearly rotund 
to ovate lanceolate, or sometimes obovate, mucronate, sub- 
connate, 3 to 6 mm. wide, 4 to 10 mm. long; involucres 1 
to 2.5 mm. wide, 2 to 3 mm. high, hirsute inside; lobes 
oblong triangular, acute or bidentate, erect or slightly 
incurved, hirsute; glands semilunar, entire or slightly 
toothed between the short often incurved horns, .5 to .8 
mm. long, .8 to 1.5 mm. broad, the horns about as long ; 
bracts attached to the involucre below, linear lanceolate, 
hirsute all over; pedicels of staminate flowers pubescent ; 
capsule ovoid globose, slightly depressed, smooth, 3.5 mm. 
wide, 3 mm. high; cocci rounded, with a prominent line 
on the back; sulci shallow, obtuse; pedicel 5 mm. long; 
styles 1 mm. long, more or less united above the base, 
short bifid, stigmas clavate thickened; seeds ellipsoid, sub- 
angular in cross section, slightly flattened, covered with 
47 
