706 EUPHORBIACEAE 
1. Mozinna sessiliflora (Hook.) Small.! Perennial, glabrous, shrubby, but some- 
what succulent. Stems several dm. tall, with a smooth olive-green bark : leaves clustered 
on short stout spurs ; blades spatulate or cuneate, 2-4 cm. long, entire or merely toothed at 
the tip, sessile or nearly so: flowers clustered, the staminate pedicelled : calyx pubescent, 
various, the staminate with ovate-lanceolate, acutish sepals, the pistillate with lanceolate 
acuminate sepals : corolla pubescent ; tube surpassing the calyx ; lobes oblong or ovate, ob- 
tuse, shorter than the tube : capsules about 2 cm. long, sharp-tipped, oblique at the base, 
pubescent or glabrate: seeds less than 1.5 cm. long, oblong-oval. [Jatropha spathulata var. 
sessliflora (Hook. ) Muell. Arg. ] 
On prairies and hillsides, Texas and adjacent Mexico. 
20. CNIDOSCOLUS Pohl. 
Perennial monoecious herbs or shrubs, with stinging-bristly foliage. Leaves alternate : 
blades entire, lobed or divided, petioled. Flowers apetalous, in cymes, the staminate with 
a corolla-like 5-lobed calyx. Stamens usually numerous (10-30) and in several series : 
filaments mostly united at the base, the inner sometimes imperfect.  Pistillate flowers in 
the lower forks of the cymes. Ovary mostly 3-celled and 3-ovuled : styles united at the 
base. Capsule ovoid or subglobose, easily separating into 2-valved carpels. Seeds ovoid, 
orobovoid. Embryo stright in the fleshy endosperm. TREAD-SOFTLY. SPURGE NETTLE. 
Staminate calyx glabrous or nearly so at maturity; tube 8-10 mm. long. 1. C. stimulosus. 
Staminate calyx copiously armed with spreading bristle-like hairs ; tube 15-25 mm. long. 2. C. Texanus, 
1. Cnidoscolus stimulósus (Michx.) A. Gray. Plant bright green, armed with 
stinging hairs. Stems rather slender, erect, simple or branched, 1-12 dm. tall : leaf-blades 
nearly orbicular in outline, 8-30 cm. broad, truncate or cordate at the base, deeply 3-5- 
lobed; the lobes entire, toothed or pinnatifid : calyx of the staminate flowers salverform, 
white or pink, glabrous or nearly so at maturity ; tube 8-10 mm. long; lobes about as 
long as the tube: capsules oblong, 10-16 mm. long, papillose, wrinkled : seeds oblong- 
obovoid, 10-12 mm. long, smooth, mottled. [Jatropha stimulosa Michx. ] 
In dry sandy soil, Virginia to Florida and Texas. Spring to fall. AA 
2. Cnidoscolus Texanus (Muell. Arg.) Small. Plants copiously armed with rigid 
bristle-like hairs. Stems 3-6 dm. tall, simple or branched above, bristly : leaf-blades sub- 
orbicular in outline, deeply 3—5-lobed, 6-15 cm. broad, the lobes toothed, angled or pin- 
natifid, acute or somewhat acuminate ; petioles nearly as long as the blades or longer, 
bristly like the stem : clusters many-flowered, densely bristly : calyx white; tube cylindric 
or nearly so, 2-2.5 cm. long, pubescent with firm bristles ; lobes oblong to spatulate-oblong, 
about as long as the tube or somewhat shorter, often sharply bristly without : capsules 
slightly larger than those of the preceding species. [Jatropha Tech Muell. Arg.] 
In sandy soil, Arkansas and the Indian Territory to Texas. Spring to fall. 
21. JATROPHA L. 
Perennial caulescent monoecious herbs, often woody below. Leaves alternate: blades 
angled or lobed, petioled. Flowers petaliferous, cymose, the staminate inconspicuous, with 
5 sepals and 5 more or less united petals. Stamens 10, the inner sometimes imperfect : 
filaments united below.  Pistillate flowers mainly below the staminate. Ovary 2-3-celled, 
or rarely 4-celled. Capsule separating in 2 carpels or usually 3 carpels. Seeds usually 
minutely carunculate. : 
1. Jatropha gossypifdlia L. Perennial, shrubby. Stems 3-7 dm. tall, branching: 
leaf-blades palmately 3-5-lobed, 8-15 em. broad, often lustrous above, the segments shal- 
lowly toothed, glandular-ciliate, acute or acuminate ; petioles shorter than the blades, con- 
spicuously glandular-pubescent, the hairs often in clusters : capsules globular-oblong, about 
1 cm. long, slightly warty : seeds oblong, 7-8 mm. long, mottled. 
In sandy soil, Key West and tropical America. Also in Africa. 
22. MÁNIHOT Adans. : 
Vigorous monoecious herbs or shrubs, commonly with glaucous and glabrous foliage. 
Leaves alternate: blades entire or palmately 3-7-lobed or 3-7-parted, the segments —€— 
branous or leathery, entire or lobed. Flowers apetalous, in racemes or panicles, the stami- 
1 Another species, Mozinna spathulata Ortega, of Mexico, western Texas and New 
Mexico, with some of the leaves lobed and slender-pedicelled staminate flowers, may 
found within our range. 
