GREENMAN. — GENUS HOUSTONIA. 291 
at the throat, almost funnelform: capsule about two thirds inferior, 
globose or short-oblong, obtuse or slightly retuse, pubescent, much ex- 
ceeded by the erect persistent calyx-divisions ; seeds more or less crateri- 
form, somewhat roughened on the back. — Proc. Am. Acad. xvii. 203, 
& Syn. FI. N. A. i. pt. 2, 27; Hemsl. Biol. Centr.-Am. Bot. iv. 47. 
Hedyotis (Ereicotis) acerosa, Gray, Pl. Wright. i. 81. Oldenlandia 
(Ereicotis) acerosa, Gray, -Pl. Wright. ii. 67. Mallostoma acerosa, 
Hemsl. Biol. Centr.-Am. Bot. ii. 31.— Northern Mexico, Parry, nos. 7, 
302, Gregg, no. 72, Palmer, nos. 400,401, 402, 403 ; adjacent Texas, 
Wright, nos. 237 (type), 1118, Thurber, no. 91, and Bigelow. 
H. polypremoides, Gray. Low, cespitose, 6 to 15 cm. high, much 
branched from a woody perennial base: stems strict, ascending or erect, 
usually branched above, glabrous or densely hirtellous-puberulent: leaves 
less fascicled than in the preceding species, acerose-linear, 5 to 10 mm. 
long, glabrous or hirtellous, margin revolute, often ciliate, midrib thick- 
ened: flowers dimorphous, sessile or distinctly pedicellate, terminating 
the stems and branches; pedicels elongated in fruit, reaching a length of 
13 mm.: calyx-divisions awl-shaped, 3 to 4 mm. long: corolla salver- 
form or slightly funnelform, “white changing to purple,” 8 to 10 mm. 
long : capsule globose, about two thirds inferior; seeds open-crateriform, 
oblong-rotund with a short hilar ridge. — Proc. Am. Acad. xxi. 379.— 
Chihuahua, Santa Eulalia Mountains, Pringle, nos. 16, 356; on route 
from Leavenworth to El Paso, F. R. Diffenderffer ; at junction of Dela- 
ware Creek and Pecos River, Texes, Pope... | : 
Var. Bigelovii. A form with the calyx-lobes 1} to 2 mm. long, 
otherwise as in the type. — Florence Mountains, Bigelow, in the Mexican 
Boundary Survey, June, 1852, no. 437. 
* * Distinctly shrubby, 2} dm. or more high, much branched: leaves thickish, 
more or less fascicled: inflorescence in cymes terminating the stems and 
branches, 
* Leaves 3 to 10 mm. in length, much fascicled : corolla 3 to 4 mm. long. 
H. fasciculata, Gray. A low bushy shrub, much branched: stem 
and branches covered with a grayish bark: branchlets tetragonal, hirtel- 
lous-puberulent : leaves linear, subterete, thick, rigid, nearly equalling the 
internodes, decidedly fascicled in the axils, glabrous or hirtellous, margin 
revolute ; stipules short, scarious, 1 to 3 setiferous-dentate: cymes few- 
Owered: flowers small, “ white, drying purple,” dimorphous: calyx- 
divisions short, about 1 mm. long, obtuse, usually puberulent: corolla 
deeply 5-lobed ; lobes recurved; tube long-pilose-pubescent on the inner» 
surface: capsule oblong ; seeds oblong, peltate, concayo-convex, minutely 
