242 NORTH AMERICAN FLORA [VorumE 21 
tending leaves; bracts lanceolate or lance-ovate, 6-10 mm. long, long-attenuate, glabrous or 
viscid-puberulent, ciliate; perianth about 1.5 cm. long, viscid-puberulent outside, the limb 
3-4 mm. broad, greenish-white; fruit 1.5~3 em. long, usually 3-winged, retuse or rounded at 
the apex, the body very thick, loosely spongious, coarsely rugose or nearly smooth, glabrous . 
or obscurely puberulent, the wings thin, finely veined, scaberulo-ciliolate; seed narrowly oblong, 
6-8 mm. long, obtusely 3-angulate, brown. 
TYPE LOCALITY: Near the mouth of the Sweetwater River [Natrona County, Wyoming]. 
DISTRIBUTION: In sandy soil, western Kansas to North Dakota, Montana, Nevada, and north- 
ern New Mexico. 
go Britt. & Brown, Ill. Fl. f. 1423; ed. 2. f. 1732; Clements, Rocky Mt. FI. pl. 9, 
4. Tripterocalyx Wootonii Standley, Contr. U. S. Nat. Herb. 12: 
329. 1909. 
Plants ascending or decumbent, 2-5 dm. high, much branched, the branches stout, pale- 
green, densely pubescent with short slender viscid hairs when young, glabrate in age; petioles 
1.5-5.5 cm. long: leaf-blades narrowly deltoid-oblong to oblong-ovate, oblong, broadly ovate, 
or rhombic-ovate, 2.5-6.5 cm. long, 0.8-3 em. wide, rounded to broadly cuneate at the base, 
narrowed to an obtuse, rounded, or rarely acute apex, bright-green above, glaucous or glauces- 
cent beneath, when young pubescent with short slender viscid hairs, glabrate in age; peduncles 
3-15 cm. long; bracts linear-lanceolate, 11-18 mm. long, long-attenuate, viscid-villous with 
short hairs; perianth 2.5—3.2 cm. long, viscid-puberulent outside, the limb 8-10 mm. broad, 
white inside, pale-pink outside, the lobes emarginate; fruit 1.5-2 cm. long, usually 3-winged, 
rounded at both ends, the body hard and rigid, 1-3-costate between each pair of wings, sparsely 
puberulent or glabrous, the wings thin, finely reticulate-veined, scaberulo-ciliolate; seed nar- 
rowly oblong, 7-8 mm. long, 2 mm. in diameter, rounded at the apex, acute at the base, pale- 
brown. 
TypE Locality: Near Ojo Caliente, Zufii Reservation, New Mexico. 
Disrrisution: In dry, sandy soil, northwestern New Mexico and northern Arizona; probably 
also in adjacent Utah and Colorado. 
5. Tripterocalyx cyclopterus (A. Gray) Standley, Contr. U. S. Nat. 
Herb. 12: 329. 1909. 
Abronia cycloptera A. Gray, Am. Jour. Sci. II. 15: 319, excluding synonyms. 1853. 
Abronia carnea Greene, Pittonia 3: 343. 1898. 
Plants erect or decumbent, 3-6 dm. high, much branched, the branches very stout, 
sparsely scabrous with short conic hairs or glabrate; petioles 2.5-5 cm. long; leaf-blades oblong 
to lance-oblong, ovate-oblong, or narrowly ovate, 4-7.5 cm. long, 1.5-3.5 cm. wide, truncate 
to obtuse at the base and usually unequal, acute to obtuse at the apex, sometimes apiculate, 
bright-green above, glaucous or glaucescent beneath, scabrous beneath when young, glabrate 
in age; peduncles 3-11 cm. long; bracts ovate, lance-ovate, or oval, 12-22 mm. long, rather 
abruptly long-attenuate, very thin, usually glabrous, ciliate; perianth 3-3.5 cm. long, viscid- 
puberulent or short-villous outside, bright-pink, the limb 8-13 mm. broad, the lobes deeply 
bilobate; fruit 2-3.5 cm. long, usually 3-winged, the body hard and rigid, 3-costate between 
each pair of wings, glabrous or obscurely puberulent, the wings thin, finely reticulate-veined, 
scaberulo-ciliolate, the terminal flower of each head rarely producing an elliptic-fusiform ex- 
alate fruit; seed narrowly oblong, 8-9 mm. long, rounded at the apex, acute at the base, pale- 
brown. 
‘Type LocaLiry: Along the Rio Grande, southern New Mexico. 
DISTRIBUTION: In dry, sandy soil, western Texas, southern New Mexico, and northern Chi- 
huahua. 
26. ABRONIA Juss. (Gen. 448, hyponym. 1789); Lam. Tab. Encyc. 
1: 469. 1791. 
Tricratus L’Hér.; Willd. Sp. Pl. 1: 807. 1799. 
Annual or perennial herbs with branched stems, sometimes cespitose and apparently 
acaulescent, more or less pubescent with viscid hairs. Leaves opposite, petiolate, those of a 
