GREENMAN. — GENUS HOUSTONIA. 287 



angnstifolia, Michx., var. Hgidinscula, Gray, Syn, Fl. N. A. i. pt. 2, 

 27, iu part. — Corpus Christi, Texas, Palmer, without number, collected 

 in 1879; Heller, no. 1812. 



* * Low-tufted leafy species, 2 to 12 cm. high : pedicels reflexed in fruit : cap- 

 sule one fourth inferior ; seeds open-crateriform, oblong-rotund, with a median 

 longitudinal ridge on the hilar surface. 



•t- Distinctly perennial, multicipital from a deep ligneous root. 

 H. "Wrightii, Gray. Stems quadrangular, pruinose-puberulent : 

 leaves linear or the lower narrowly spatulate, thickish, glabrous ; stipules 

 rather pronounced, broadly deltoid, entire or minutely denticulate : flow- 

 ers dimorphous, 5 to 7 mm. long, in terminal leafy cymes : calyx-divisions 

 lance-linear, acute, 1^ to 2 mm. long, glabrous: corolla salver-shaped; 

 tube 2^^ to 4 mm. long (depending upon the long- or short-styled form 

 respectively), slightly enlarged above : seeds scrobiculate. — Proc. Am. 

 Acad. xvii. 202, & Syn. Fl. N. A. i. pt. 2, 26. H. humifusa^ Hemsl. 

 Biol. Centr.-Am. Bot. ii. 30, not Gray. Hedyotis {Houstonia) humi- 

 fusa, Gray, PI. Wright, i. 82. Oldenlandia (^Houstonid) humifusa^ Gray, 

 PI. Wright, ii. 68, excl. syn. — State of Mexico, in meadows on the 

 Sierra de las Cruces, elevation 3,000 m., Priugle, no. 5744; on the 

 Serrania de Ajusco, altitude 3,000 m., Pringle, no. 6468; San Luis 

 Potosi, elevation 1,800 to 2,460 m.. Parry &, Palmer, no. 301 ; in the 

 vicinity of the city of Durango, Palmer, no. 312 ; Chihuahua, on the 

 summits of Sierra Madre, Pringle, no. 2284 ; and on dry mountain sides, 

 Chuchuichupa, in the same State by C. V. Hartraan, no. 705 ; New 

 Mexico, Wright, no. 241, Thurber, nos. 717, 1121 ; Santa Magdalena 

 Mountains, Vasey ; near Santa Rita del Cobre, E. L. Greene ; Arizona, 

 at Fort Whipple, Coues & Palmer, no. 75 ; in the San Francisco Moun- 

 tains near Clifton, E. L. Greene ; Prescott, Dr. Smart, no. 460 ; Lem- 

 mon, nos. 2726, 512, 512|^; in the Rincon and Santa Rita Mountains, 

 Pringle ; at Willow Spring, Palmer, no. 523. 



H. rubra, Cav. Much depressed, rather dense, 2 to 10 cm. high: 

 stems and leaves hispidulous or nearly glabrous : leaves linear, or the 

 lower oblanceolate-linear, 5 to 25 mm. long; stiixiles short with one or 

 more setge : flowers \\ to 2|^ cm. long, axillary: calyx-divisions linear, 

 acute, in anthesis 2 mm. long, in fruit somewhat elongated : corolla red 

 or purple varying to white ; tube slender : capsule depressed, subro- 

 tund ; seeds scrobiculate. — Ic. v. 48, t. 474, f. 1 ; Benth. PI. Hartw. 15 ; 

 Hemsl. Biol. Centr.-Am. Bot. ii. 30; Gray, Syn. Fl. N. A. i. pt. 2, 25. 

 Oldenlandia {Hoiistonid) ruhra^ Gray, PI. Wright, ii. 68. — Aguas 

 Calientes, Hartweg, no. 93 ; Valley of San Luis Potosi, Schaflfner, 



