WOOTON AND STANDLEY—FLORA OF NEW MEXICO. 401 
RanGE: British America to Texas and Mexico. 
New Mexico: Shiprock; Dulce; Tunitcha Mountains. Sandy soil, in the Upper 
Sonoran Zone. 
18. Chamaesyce rugulosa (Engelm.) Rydb. Bull. Torrey Club 83: 145. 1906. 
Euphorbia serpyllifolia rugulosa Engelm.; Millsp. Pittonia 2: 85. 1890. 
Tyre Locauity: San Bernardino, California. 
Rance: California to Colorado and New Mexico. 
New Mexico: Dulce (Standley 8135). Open hills, in the Upper Sonoran Zone. 
7. REVERCHONIA A. Gray. 
Slender, smooth, divaricately branched annual, 30 cm. high or less, with glaucous 
stems, narrow entire leaves, and small axillary clusters of dark purple flowers; stam- 
inate flowers with 4 sepals and 2 short stamens; pistillate flowers with 5 sepals and a 
6-lobed disk; ovary 3-celled; styles 3, distinct; fruit a dry capsule. 
1. Reverchonia arenaria A. Gray, Proc. Amer. Acad. 16: 107. 1881. 
Type LocauiTy: Sandhills of the Brazos, Baylor County, Texas. 
Rance: Texas and southern New Mexico, south into Mexico. 
New Mexico: Lava; sands northeast of Jornada Range, Dona Ana County; Roswell. 
Dry hills and plains, in the Lower Sonoran Zone. 
8. PHYLLANTHUS L. 
Low herbaceous perennial from a woody base, 10 to 20 cm. high, with slender 
smooth stems, small leaves, and very small greenish flowers; leaves narrowly oblong- 
cuneate, with lanceolate stipules at the base of the short petiole; flowers in axillary 
few-flowered clusters, moncecious; staminate flowers about 0.5 mm. long, the pistillate 
about 3 times as large, on very slender pedicels; sepals 5 or 6, green, white-margined, 
persistent at the base of the 3-celled 6-valved 3-seeded capsule. 
1. Phyllanthus polygonoides Nutt.; Spreng. Syst. Veg. 3: 23. 1826. 
TYPE LocaLity: ‘‘Ditio Arcansa Amer. bor.’ 
Rance: New Mexico to Texas and Oklahoma. 
New Mexico: Organ Mountains; Queen; Hatchet Ranch. Dry, rocky hillsides, 
in the Upper Sonoran Zone. 
9. JATROPHA L. 
Herbaceous perennial from a thickened tuberous root; stems thick and succulent, 
30 to 50 cm. high, erect; leaves petiolate, palmately 3 to 5-lobed, 10 cm. in diameter 
or less, the lobes triangular-lanceolate, with rather numerous coarse aristate teeth; 
stipules, bracts, and sepals laciniately lobed into linear segments; flowers large, in a 
terminal cyme; sepals 5, united below; petals 5, bright pink, about 1 cm. long; fila- 
ments united below, unequal; fruit a 3-celled capsule, each 2-valved cell containing 
a single large carunculate seed. 
1. Jatropha macrorhiza Benth. Pl. Hartw. 8. 1839. 
TYPE Locaity: Mexico. 
Rance: Southern New Mexico and Arizona to Mexico. 
New Mexico: Southern Grant and Luna counties. Sandy plains, in the Lower 
Sonoran Zone. 
10. DITAXIS Vahl. 
Moneecious herbaceous perennials with simple alternate leaves and axillary clusters 
of flowers; staminate flowers with 4 or 5 sepals, the petals of the same number and 
alternate with them; stamens once, twice, or thrice the number of the petals, with 
united filaments; petals of the pistillate flowers smaller or rudimentary; styles 3, 
2-cleft; fruit a 3-seeded capsule; seeds globose. 
52576°—15 26 
