50 UNITED STATES AND MEXICAN BOUNDARY. 



Cibolo; a tributary 



Phaseoliis a:^gttstissimuSj Gray, PL Wright. 2^ p. 33. Dry ravines on the 

 of the Kio Grande, Cohahuila, July ; Bigeloiv, 



PhaseoluS; macropoides. Gray, I, c. Hills at the Copper MineSj August ; Bigelow. 



■ 



Phaseolus atropurpukeus (n, sp.:) caulibus volubilibus retrorsim pubescentibus ; stipulisminutis 



subulatis ; foliolis lanceolatis basi dilatatis utrinque pubescentibus lateralibus ad basim unilobatis, 



terminati trilobo ; pedunculis folio multoties longioribus paucifloris ; calycibus subsessilibus, 



laciniis inferioribus" lanceolato-subulatis, superioribus triangulari-lanceolatis, alis corollse late 



ovatis (atropurpureis) vexillo duplo longioribus ; leguminibus deflexis lineari-falcatis 7 — 9- 



spermis. Eocks on the Eio Cibolo of the Rio Grande, and ravines, Bufitillo ; Bigelotv. Presidio 



del Korte, July — August ; Parry. Leaflets 1| — 2^ inches long, tapering to a long narrow 



point ] the lateral ones with large acute lobe on the outer side at the base ; the terminal leaf 



more or less dilated at the base, and usually 3-lobed, but sometimes (especially in the lower 

 leaves) only obscurely lobed. Peduncle 8 — 12 inches long, and still more elongated in fruit. 



Flowers 6 — 10, at first approximated toward the extremity of the peduncle, but afterwards 



distant. Pods about 3 inches long and 2 lines wide. Seeds oblong, compressed, about 2A lines 



longj and 1| wide ; smooth 

 from anv Phaseolus hithert 



■ with dark purple. This seems to be quite distinct 

 Schott found on the sea beach at Brazos Santiasfo, 



Texas, a plant allied to this, but much more downy, and the leaflets half as large, ovate 

 obtuse, with very short lobes. The specimens are not sufficiently complete for a more minute 

 comparison. 



YiGNA villosa, Savi. f DC. Prodr. I. 2, p. 40. Thickets on the Rio Grande, between Ringgold 

 Barracks and Laredo ; Schott. If, as is probable, this andY. glabra are not specifically distinct, 

 it ought to be called Y. luteola, the genus Yigna having been founded on Dolichos luteolus, 

 Jacq. 



Bachuachi 



sTA CORALLOIBES, Moc. d Sesse in DC. Prodr. 2, p. 413.^ Gray, PI, Thurh. p. 301. 



and Gaudaloupe canon, June (in flower) and August (in fruit) ; Thurher. Summit 

 of mountains north of Imores ; Capt. E. K. Smith ; and Sierra del Pajarito, in the same State ; 

 Schott. I have followed Dr. Gray in naming this plant, but it does not well accord with the 

 description of De Candolle. The leaves are broader than long, and the petioles in our specimens 

 are more or less prickly. Indeed, it scarcely difiers from E, herbacea, of the southern States, 

 for that species becomes shrubby in Florida, and the stem, as well as the petioles, prickly. 



Ehynchosia Texana, Torr. d Gray, Fl. 1, p. 68Y- Western Texas; also near the Copper 

 Mines and Sonora, May — June. 



Rhynchosia Texana, var. axgustifolia. Gray, PI. Wright. 1, p. 44. Mountain ravines? 



between Yan Horn's Wells and Muerte, July ; Parry 



DQ. Prodr. 2, p. 384. Sandy places, low land. Texas, June 



Th 



Centros^ma Yihginiana, Benth.; Torr. & Gray, Fl. 1, p. 290. Yar. foliolis minoribus angus" 

 tioribusque. Brazos Santiago, May ; Schott. 



Galactia marginalis, Benth.; Torr, & Gray, Fl. l,p. 288. Western Texas, near the Kio 

 Grande ; Parry. 



Galactia tephrodes^ H. B. Kth. ; Gray, PI. Wright. %, p. 34. Kavines near Kock creek J 

 Bigeloio. Janes, Chiliualiua ; Thurher. 



Galactia caxescens, Benth.; Torr. d Gray, Fl. 1, p. 288. Sandy places between Einggold 

 Barracks and Laredo, Texas : Schott. 



