198 NORTH AMERICAN FLORA [VoLUME 21 
1. Selinocarpus angustifolius Torr. Bot. Mex. Bound. Surv. 170. 
1859. 
Plants erect, 1-4 dm. high, fruticose below, much branched from the base and rather 
sparsely branched above, the branches slender, whitish, glandular-puberulent and bearing 
numerous short white appressed flat’ hairs, glabrate in age, the internodes longer than the 
leaves; petioles 2 mm. long, or shorter, the blades often sessile, oblong-linear or Jance-linear, 
8-18 mm. long, 1-3 mm. wide, acute to rounded and apiculate at the apex, thick and 
fleshy, puberulent, and when young covered with numerous short white appressed hairs: 
flowers few, often cleistogamous, on pedicels 2 mm. long or shorter, the bractlets minute, 
subulate; perianth 8-10 mm. long, glandular-puberulent outside, the tube 3 mm. long, the 
limb 7-8 mm. broad; stamens 5; fruit 5.5-7.5 mm. long, the 5 wings 2-2.5 mm. wide, the 
body costate, puberulent, truncate at both ends. 
TYPE LOCALITY: Gravelly tableland near Presidio del Norte, Texas. 
DIsTRIBUTION: Western Texas and Coahuila. 
ILLUSTRATION: Bot. Mex. Bound. Surv. 1. 47, A. 
2. Selinocarpus diffusus A. Gray, Am. Jour. Sci. II. 15: 262. 1853. 
Selinocarpus diffusus nevadensis Standley, Contr. U. S. Nat. Herb. 12: 388. 1909. 
Plants erect or decumbent, from a stout woody root, 1-3 dm. high, much branched from 
the base and also above, the branches rather slender, covered with short appressed inflated 
white hairs and very sparsely glandular-puberulent or hirtellous, very leafy; petioles slender 
or stout, 0.3-2.5 cm. long, often exceeding the blades; leaf-blades oval, oval-ovate, ovate- 
oblong, or rarely rhombic-orbicular, 1.2-2.5 em. long, 0.6-1.5 em. wide, rounded to obtuse at 
the base, slightly unequal and short-decurrent, broadly rounded to acute at the apex, thick 
and fleshy, flat or crispate, when young densely covered with short appressed inflated white 
hairs, glandular-puberulent and scabrous, sometimes glabrate in age; flowers often all cleisto- 
gamous, short-pedicellate, the bracts linear-subulate, 3-6 mm. long; perianth 3.5—4.5 cm. long, 
densely glandular-hirtellous outside, the tube very slender, the limb 1.5 cm. broad, pale green- 
ish-yellow; stamens 5, slightly exserted; fruit 6-7 mm. long, the 5 wings 2-3 mm. long, glabrate, 
the body subtruncate at both ends, puberulent; seed narrowly elliptic, 4.5 mm. long, light- 
brown. 
Tyre Locality: Rocky hills and valleys from the Pecos to the Limpio, Texas. 
DistRiBuTION: In dry soil, western Texas to southern Utah and Nevada. 
ILLUSTRATION: E. & P. Nat. PAél. 31: f. 5 
3. Selinocarpus parvifolius (Torr.) Standley, Contr. U. S. Nat. 
Herb. 12: 388. 1909. 
Selinocarpus diffusus parivfolius Torr. Bot. Mex. Bound. Surv. 168. 1859. 
Plants erect, 2-4 dm. high, suffrutescent at the base, much branched, the branches stout, 
glandular-puberulent and bearing numerous short stout flat white appressed hairs, glabrate 
in age, glaucous; petioles stout, 3-6 mm. long; leaf-blades oval to ovate-oval, 1-2.2 cm. long, 
0.5—1 cm. wide, obttuise or acute at the base, obtuse or rounded at the apex, thick and fleshy, 
crispate, puberulent; flowers numerous, terminal, short-pedicellate, subtended by broadly 
ovate minute bracts, the inflorescence repeatedly dichotomous, dense, bearing numerous 
orbicular or ovate-orbicular, petiolate, bractlike leaves 2-3 mm. long; perianth 3-4 cm. long, 
densely glandular-puberulent, the tube very slender, the limb about 13 mm. broad; fruit 
9-10 mm. long, 5-winged, the wings 3-4 mm. broad, the body striate, finely glandular-puberu- 
lent. 
TyPE LOCALITY: Canyons of the Rio Grande, Texas. 
DistR1BUTION: Southwestern Texas. 
4. Selinocarpus lanceolatus Wooton, Bull. Torrey Club 25: 304. 
1898. 
Plants erect or decumbent from a woody base, 1.2-3 dm. high, much branched, densely 
leafy, covered throughout with slender short appressed white inflated hairs, or in age glabrate, 
