288 PROCEEDINGS OF THE AMERICAN ACADEMY. 



no. 26 ; region of San Luis Potosi, altitude 1,800 to 2,460 m., Parry & 

 Palmer, no. 300 ; hills and plains near Chihuahua, Pringle, no, 274 ; 

 Sonora, south of San Luis, Parry, no. 6; Thurber, nos. 319, 707 ; with- 

 out locality, Coulter, no. 196 ; New Mexico, Fendler, no. 291, Wright, 

 no. 1119, Palmer, no. 93; Arizona, Wolf & Rothrock, no. 865; in the 

 Huachuca Mountains, Lemmou, no. 2725, at Bisbee, F. E. Lloyd. 



-t- -I- Distinctly annual : stems dichotomously branched : corolla funnelform. 



H. hnmifusa. Gray. A low annual : stems dichotomously branched, 

 hispidulous : leaves linear or the lower oblanceolate, 1 to 1|^ cm. long, 1 

 to 5 mm. broad, mucronate, hispidulous above, margins revolute : stip- 

 ules broad, scarious, and setiferous : flowers axillary, rather numerous 

 above : calyx-divisions setaceous-subulate, 3 to 4 mm. long : corolla 

 open-funnelform, 6 to 7 mm. long ; lobes pubescent above : pedicels 

 strongly recurved in fruit : capsule depressed-globose, subdidymous. — 

 Proc. Am. Acad. iv. 314. Hedyotis {Houstonia) humifasa, Gray, PI. 

 Lindh. ii. 216. — New Mexico, Thurber, no. 292; Texas, Lindheimer, 

 nos. 621, 622, 377, 378 ; E. Hall, no. 286 ; on sandy prairies near 

 Austin, Wright ; Belknap. Sutton Hayes, no. 333 ; Colorado City, Rever- 

 chon, no. 60 ; on sandy hills and plains near Sweetwater, Curtiss, no. 

 1140; also specimen cultivated in the Cambridge Botanic Garden in 1849. 



» * * A low slender leafy stemmed annual, with small white flowers on spread- 

 ing axillary pedicels : capsule three fourths inferior. 



H. snbviscosa, Gray. A delicate herb, 4 to 15 cm. high : stems 

 branched from the base : branches spreading, covered with a subviscid 

 hirtellous pubescence: leaves linear-filiform, 5 to 15 mm. long, glabrous 

 or hirtellous : stipules short, scarious, minutely setulose-ciliate : pedicels 

 filiform, 3 to 8 mm. long, horizontally spreading but scarcely reflexed in 

 fruit : calyx hirtellous-pubesceut ; divisions acute, about 1 mm. long : 

 corolla salverform, about 3 mm. long : capsule subdidymous, broader 

 than long ; seeds open-crateriform, minutely scrobiculate. — Proc. Am. 

 Acad. iv. 314. — Oldenlandla subviscosa, Wright in Gray, PI. Wright. 

 ii. 68. — Southern Texas, Berlandier, nos. 991, 2421, and Wright, with- 

 out number. 



* * * * Slender diffuse herbs, or perennials, 5 to 25 cm. high : stems more or less 



dichotomously branched, often becoming slightly woody below : leaves linear, 



subterete or filiform, shorter than the internodes : pedicels erect or spreading 



in fruit. 



-t- Low delicate annuals : calyx adnate nearly to the top of the ovary : capsule 



clavate-turbinate or subglobose. 



H. Brandegeana, Rose. Erect or ascending, 5 to 10 cm. high, 

 freely branching from the base : stems filiform, hispidulous-puberulent : 



