GREENMAN. — GENUS HOUSTONIA. 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, 1-^ 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, 

 Bound Rock, Texas, 10 March, 1890, no. 24. 



•»--»-+- Erect or low-spreading herbaceous perennials, 1 to 4 dm. high : leaves 

 linear, linear-oblong, or ovate : inliorescence in terminal cymes : capsule 

 obcordate-compressed, or oblong and a little nerved below, one half to three 

 fourths inferior. 



++ Erect herbaceous perennials : divisions of the calyx acute. 



H. PURPUREA, L., Sp. PI. i. 105, attributed to Mexico by Hemsley 

 (Biol. Centr.-Am. Bot. ii. 30), apparently does not extend so far south. 

 Gregg's no. 66, cited by Hemsley under the above species, is Houstonia 

 angustifolia, Michx., var. rigidiuscida, 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 cm. 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 1|- 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, PI. Wright, ii. 68. 

 — Northern Mexico, Texas, northward to Iowa and eastward to Florida. 

 Mexico, Pringle, no. 2260; Texas, Lindheimer, no. 620; Berlaudier, 

 nos. 432, 681, 1062, 2413, 2560, etc.; Wright, nos. 239, 240, 1390; 

 E. Hall, no. 285; Palmer, no. 396; Heller, no. 1G61. Thurber's 

 specimen, without number, collected at Indianola, seems to be a depau- 

 perate form of this species. 



Var. filifolia, Gray. Stems profusely branched ; leaves linear- 

 filiform : capsule somewhat smaller. — Syn. Fl. N. A. i. pt. 2, 27. Ol- 

 denlandia angustifolia, Michx., yrt. flifolia, Chapm. Fl. 181. — Texas, 

 between Fredericksburg and San Sabra, Thurber, no. 67 ; Florida, at 



