202 NORTH AMERICAN FLORA [VoLUME 21- 
the apex, 5-angled or 5-sulcate, the ribs smooth, sometimes bearing a gland at or near the 
apex, viscid when moistened. Seed with testa adherent to the pericarp; embryo uncinate; 
cotyledons broad, enclosing the copious farinaceous endosperm; railicle elongate, descending. 
Type species, Acleisanthes crassifolia A. Gray. 
Fruit deeply sulcate, the ribs ending above in conspicuous tubercles or glands. 
Glands of the fruit on globose tubercles at the summit of the ribs; bracts 
less than half as long as the fruit; leaf-blades usually rounded at the apex. 1. A. Wrightii. 
Glands in depressions below the tubercles at the summit of the ribs; bracts 
equaling or exceeding the fruit; leaf-blades mostly acute or abruptly 
_ acute. 2. A. acutifolia. 
Fruit not deeply sulcate, 5-angulate, without glands above. 
Leaves of a pair very unequal, the smaller one one fourth as long as the 
larger or smaller; leaf-blades oval. 3. A. anisophylla. 
Leaves of a pair subequal. 
Fruit densely covered with short flat white appressed hairs; leaf-blades 
ovate or ovate-oblong; perianth 4 cm. long. 4, A. crassifolia. 
Fruit glabrous or cinereo-puberulent with slender hairs; leaf-blades 
chiefly deltoid in outline. 
Perianth 9-17 cm. long; leaf-blades mostly acuminate or long-acumi- 
nate at the apex. 5. A. longiflora. 
Perianth 3.5-5.5 cm. long; leaf-blades mostly acute to rounded at the 
apex. 
Leaf-blades rounded or very obtuse at the apex, most of them as 
broad as long; perianth 3.5-4.5 cm. long. 6. A. obtusa. 
Leaf-blades acute or sometimes acuminate at the apex; perianth 
4-5.5 em. long. 7. A. Greggii. 
1. Acleisanthes Wrightii (A. Gray) Benth. & Hook.; Hemsl. Biol. 
Centr. Am. Bot. 3: 6. 1882. 
Pentacrophys Wrightit A. Gray, Am. Jour. Sci, II. 15: 261. 1853. 
Plants erect or ascending, from a fruticose caudex, 1-3 dm. high, much branched from 
the base, the branches glandular-hirtellous; leaves of a pair subequal, the petioles 3~15 mm. 
long, the blades suborbicular to oval, 0.8-2.5 cm. long, 0.6-1.6 cm. wide, rounded at both ends 
or rarely only obtuse and apiculate at the apex, slightly unequal at the base, thick and firm, 
often crispate, paler beneath, glandular-hirtellous or puberulent; flowers axillary, solitary, 
sessile, usually cleistogamous, the bracts linear-subulate, hirtellous, one third as long as the 
fruit or shorter; perianth of the cleistogamous flowers 5 mm. long, densely glandular-hirtellous, 
with 2 stamens; fruit oblong, 6 mm. long, truncate at both ends, deeply 5-sulcate, glandular- 
puberulent, the coste broad, smooth, each ending above in a globose glanduliferous tubercle. 
Type Locality: Stony prairies at the Big Bend of the San Pedro River, western Texas. 
DIstRIBUTION: Western Texas. 
ILLUSTRATION: Bot. Mex. Bound. Surv. pl. 47, B, I. 
2. Acleisanthes acutifolia Standley, Contr. U.S. Nat. Herb. 12: 370. 
1909. 
Penaeus Wrightti Torr. Bot. Mex. Bound. Surv. 170, in part. 1859. Not P. Wrightii A. Gray, 
1853. 
Plants ascending or procuumbent, from a thick woody base, much branched from the base, 
the branches stout, 1-4 dm. long, puberulent and sparsely glandular-hirtellous, glaucous; 
leaves of a pair subequal, the petioles 3-8 mm. long, or wanting in the uppermost leaves, the 
blades oblong-elliptic to oval, 1.2-5 cm. long, 0.4-2 cm. wide, obtuse to acute at the base, 
obtuse or acttte at the apex, usually crispate, thick and fleshy, glaucescent beneath; flowers 
axillary, sessile or short-pedicellate, usually solitary, the bracts linear-subulate, equaling or 
often slightly exceeding the fruit, the perianth 4-4.5 cm. long, glandular-puberulent or hirtel- 
lous outside, the tube slender, 1.5 mm. in diameter, the limb 2-2.5 cm. broad; stamens 5, 
short-exserted; fruit oval-oblong, 6 mm. long, rounded at the base, constricted and truncate 
at the apex, glandular-puberulent or glabrate, 5-suleate, the costee broad, flat, smooth, each 
bearing a gland in a depression below the apex. 
TYPE LOCALITY: Maxon’s Spring, Texas. ; 
DISTRIBUTION: Southwestern Texas, Chihuahua, and Coahuila. ae 
ILLUSTRATION: Bot. Mex. Bound. Surv. $l. 47, f. B, B2, B3 (as Pentacrophys Wrightii). 
