GREENMAN. — GENUS HOUSTONTIA. 285 
lous upon the angles: lower leaves oblanceolate; upper gradually nar- 
rowed to linear, 7 to 17 mm. long: stipules broadly ovate, scarious, 
minutely denticulate: flowers minute in the axils near the ends of the 
branches: pedicels 1 to 6 mm. long: calyx glabrous; lobes linear-oblong, 
acutish, spreading or recurved, 14 to 2 mm. long: corolla white, equalling 
or slightly exceeding the lobes of the calyx; lobes erect, glabrous, about 
equalling the tube: capsule three fourths inferior ; seeds open-crateriform, 
oblong-rotund, with a median hilar ridge.— Collected by J. E. Bodin, 
Round Rock, Texas, 10 March, 1890, no. 24. 
+ + + Erect or low-spreading Epon Bren 1 to 4 dm. high: leaves 
linear, linear-oblong, or ovate: inflorescence in terminal cymes: capsule 
obcordate-compressed, or oblong and a Tittle nerved Salon: one half to three 
fourths inferior. 
++ Erect herbaceous perennials: divisions of the calyx acute. 
H. purpurga, L., Sp. Pl. i. 105, attributed to Mexico by Hemsley 
(Biol. Centr.-Am. Bot. ii. 30), apparently does not extend so far south. 
Grege’s no. 66, cited by Hemsley under the above species, is Houstonia 
angustifolia, Michx., var. rigidiuscula, Gray. 
H. angustifolia, Michx. Erect, usually much branched from a 
woody perennial base: stems strict, quadrangular, glabrous: leaves linear 
to oblanceolate-linear, 1 to 5 em. long, 1 to 5 mm. broad, often hispidu- 
lous upon the recurved margins and upon the midrib above: inflorescence 
cymose, corymbosely or paniculately branched; pedicels slender, erect, 
2 to 8 mm. long: flowers dimorphous: calyx-lobes 1 to 14 mm. long, 
acute: corolla somewhat funnelform, about 6 mm. long ; tube pubescent 
within ; lobes pubescent above: capsule oblong-obovate, about three 
fourths inferior, the free portion usually a little exceeded by the persist- 
ent calyx-lobes ; seeds slightly concavo-convex, distinctly scrobiculate. — 
Fl. i. 85; Gray, Syn. Fl. N. A. i. pt. 2,26. Hedyotis stenophylla, Torr. 
& Gray, Fl. ii. 41. Oldenlandia angustifolia, Gray, Pl. Wright. ii. 68. 
— Northern Mexico, Texas, northward to Iowa and eastward to Florida. 
— Pringle, no. 2260; Texas, Lindheimer, no. 620; Berlandier, 
- 482, 681, 1062, 2413, 2560, etc.; Wright, nos. 239, 240, 1390; 
E ‘Hall, no. 285; Palmer, no. 396; Heller, no. 1661. Thurber’s 
specimen, without number, collected at Indianola, seems to be a depau- 
perate form of this species. : 
Var. filifolia, Gray. Stems ie branched; leaves linear- 
filiform : capsule somewhat smaller. — Syn. Fl. N. A. i. pt. 2, 27. Ob 
denlandia angustifolia, Michx., var. filifolia, ne Fl. 181.— Texas, 
between Fredericksburg and San Sabra, Thurber, no. 67; Florida, at 
