220 NORTH AMERICAN FLORA [VoLuME 21 
long, glabrous; leaf-blades broadly cordate-ovate to elongate ovate-deltoid, 2-8 cm. long, 
1-5.5 cm. wide, deeply cordate to truncate at the base and usually short-decurrent, obtuse or 
acute at the apex, entire or subsinuate, thick and succulent, green on the upper surface, often 
glaucous beneath, glabrous or obscurely puberulent; inflorescence cymose-pariculate, usually 
much branched, the branches slender, viscid-pilose with short fulvous hairs, the bracts few 
and very small, the involucres usually numerous, slender-pedunculate, viscid-pilose, about 
4 mm. long at anthesis, 6-10 mm. long in fruit, the lobes short, rounded-oval; flowers usually 
solitary in the involucre, rarely 2 or 3, the perianth sparsely pilose, 6~10 mm. long, the limb 
10-12 mm. broad; stamens 3, exserted; fruit broadly obovoid, 3.5 mm. long, dark-grayish, 
glabrous, densely covered with short rounded tubercles; seed oval-obovoid, 2.5 mm. long, 
pale-brown. 
TYPE LOCALITY: Mexico. 
DISTRIBUTION: Southwestern Texas and Coahuila to Hidalgo and Oaxaca. 
ILLustRations: Cav. Ic. pl. 379; Ortega, Dec. pl. 1. 
3. Allionia microchlamydea Standley, Contr. U. S. Nat. Herb. 
13: 405. 1911. 
Stems mostly solitary, erect, 4-8 dm. high, simple or sparsely branched below the inflores- 
cence, slender, glaucous below and glabrous, the internodes elongate; petioles slender, 0.5-3.5 
cm. long, glabrous; leaf-blades narrowly deltoid-lanceolate or lance-deltoid, 3-7 cm. long, 
0.6-1.5 cm. wide, obtuse or truncate at the base and abruptly short-decurrent, gradually 
narrowed to the obtuse apex, entire or sinuate-dentate, thick and succulent, green on the 
upper surface, glaucous or glaucescent beneath, glabrous; inflorescence cymose-paniculate, 
much branched, the branches slender, alternate, sparsely or densely viscid-pilose, the bracts 
minute, the involucres numerous, slender-pedunculate, about 2.5 mm. long at anthesis, 4-6 
mmm. long in fruit, viscid-pilose, the lobes rounded-oval; flowers solitary in the perianth; fruit 
broadly obovoid, 2.5-3 mm. long, dark-gray, glabrous, densely covered with coarse rounded 
tubercles; seed oval-obovoid, 2 mm. long, pale yellowish-brown. 
TypE LocaLity: In rocky soil near Ixmiquilp4n, Hidalgo. 
DisTrisurtion: Stony hillsides, Querétaro and Hidalgo. 
4. Allionia glabra (S. Wats.) Kuntze, Rev. Gen. 533. 1891. 
Oxybaphus glaber S. Wats. Am. Nat. 7: 301. 1873. 
Oxybaphus glaber recedens Weatherby, Proc. Am. Acad. 45: 425. 1910. 
Allionia glabra recedens Standley, Contr. U.S. Nat. Herb. 13: 406. 1911. 
Stems few or solitary, erect, 8-15 dm. high, usually simple up to the inflorescence or with a 
few sterile branches below, stout, glaucous or glaucescent, glabrous; leaves distant, or crowded 
below, sessile, the blades linear, 5-12 em. long, 2-7 mm. wide, long-attenuate to the base, 
gradually narrowed to the obtuse or acute apex, entire, thick and succulent, glaucous beneath, 
glabrous; inflorescence a loose terminal panicle 1-4 dm. long, much branched, the branches 
very slender, opposite, glabrous or sparsely short-pilose with viscid hairs; involucres slender- 
pedunculate, at anthesis about 3.5 mm. long, in age 12-15 mm. broad, viscid-pilose or glabrous 
and ciliate, shallowly lobed, the lobes ovate-orbicular, rounded at the apex; flowers usually 
solitary, sometimes 2, in the involucre, mostly cleistogamous, the perianth about 7 mm. long, 
white or pale-pink, glabrous; stamens 5, short-exserted; anthocarp obovoid, about 5 mm. long, 
olivaceous, glabrous, the angles acute, narrow, smooth, the sides obtusely short-tuberculate 
or rugose; seed broadly obovoid, 3 mm. long, pale-brown. 
Type Locariry: Kanab, Utah. . 
Distrisution: In dry soil, southeastern Utah to Chihuahua, western Texas, and Kansas. 
5. Allionia exaltata Standley, Contr. U. S. Nat. Herb. 12: 355. 
1909. 
Oxybaphus exaliatus Weatherby, Proc. Am. Acad. 49: 492, 1913. 
Stems few or solitary from a stout woody root, erect, about 15 dm. high, stout, glabrous, 
glaucescent below, simple or sparsely branched below the inflorescence, the internodes elongate; 
