242 BOTANY. 
smooth, reddish capsules, the black, scantily villous scales, and the leaves 
colored alike on both sides; aments somewhat as in S. Nove Anglia, vay. 
pseudo-myrsinites, Anders., but that has beaked capsules and glabrous, 
crenate leaves, which are membranous in texture and prominently reticu- 
late-veined. 
SALIx RETICULATA, L. (Watson, vol. v, King’s Report, p. 327; Porter, 
Fl. Col. 128).—Half Moon Creek, Colorado, at 13,000 feet elevation ssa 
Popru.us MONILIFERA, Ait.—Nevada. 
PoPpuLUS BALSAMIFERA, L., var. ANGUSTIFOLIA, Watson.—Nevada and 
Utah, and San Luis Valley and Denver, Colo. (833, 834). Var. candicans, 
Gray, Colorado (835). 
PopuLus TREMULOIDES, Michx.—San Francisco Mountains, Arizona; 
also South Park, Colorado (832). 
Popuus anguLata, Ait—Denver (831). 
EUPHORBIACE~. 
By Dr. GEORGE ENGELMANN. 
CROTON CORYMBULOSUS.—Many erect stems from a ligneous base, a 
span to a foot high, simple below, branching upward; stipules subulate, 
deciduous; petioles about half as long as the oval or oblong, mostly acutish, 
leaves, which are {-1}’ long, the lowest ones broader and shorter and often 
acutish ai base, all triplinerved at base, penninerved upward, whitish below, 
greenish-gray' above; stellate hairs slightly united to scales above, almost 
free and loose below; inflorescence short, loose-flowered, corymb-like, 6-8” 
wide, mostly moncecious; pedicels 2-3’ long, much longer than the 
flowers; male flowers with 5 spatulate or lanceolate bearded petals alter- 
hating with the 5 lobes of the disk; 6-13 stamens with bearded filaments; 
female flowers mostly apetalous; styles bifid to below the middle or usually 
to the base, and together with the ovary and the oblong (3” long) capsule 
stellate scaly; seeds linear-oblong, 2’ long, delicately punctate-reticulate— 
Camp Bowie, New Mexico, Rothrock, 1874 (506). Through Western 
Texas (Wright, 641, 1805) into Mexico (Saltillo and Buena Vista, Gregg, 71, 
288). This species was first described by Torrey in Bot. Mex. Boundary, 
p- 194, under the name of C. Lindheimerianus, in which Miiller, DC. Prod. 
15, 2, 579, followed him. But Scheele’s plant thus named and described in 
