280 PROCEEDINGS OF THE AMERICAN ACADEMY 



Senecio Chihuahuensis. Perennial (?), the purplish leafy sub- 

 pubescent stem \\ feet high, branching at the top : leaves thin, some- 

 what white-tomeutose when young, glabrescent, the basal oblanceolate 

 and coarsely toothed, 2 inches long, the cauline 2 to 4 inches long, 

 ovate to oblong in outline, nearly sessile, pinnately divided, the nar- 

 row lobes usually sparingly pinnatifid or in the smaller leaves entire : 

 inflorescence cymose ; involucre calyculate, nearly glabrous, cylindric- 

 campanulate, 3 or 4 lines long; bracts 12, linear, tipped with brown: 

 rays 6 or 8, 4 lines long : acheues canescent. — On ledges of the Sierra 

 Madre, Chihuahua, at 9,700 feet altitude, under Populus tremuloides ; 

 C. G. Pringle (n. 1318), Oct., 1887. Most nearly related to some 

 forms of S. Douylasii. 



Heterotoma gibbosa. Low and very slender, branching from 

 the base, glabrous : leaves mostly radical, oblong-ovate, attenuate to a 

 short ciliate petiole, coarsely toothed, an inch long ; cauline 1 or 2, 

 ovate, sessile, dentate : flowers on long slender pedicels, small (4 lines 

 long) ; calyx very oblique ; corolla blue with a greenish throat, the 

 tube more or less gibbous at base but not at all calcarate, the upper 

 lobe of the limb rounded, the lateral broadly oblong. — Banks of 

 brooks, Ortiz, Chihuahua; C. G. Pringle (n. 1478), May, 1887. 



Polemonium pauciflorum. Perennial, a foot high or less, 

 branching and leafy, glandular-pubescent : leaflets 6 to 12 pairs, nar- 

 rowly lanceolate, acute, 9 lines long or less : flowers solitary or very 

 few at the ends of the branches, on pedicels an inch long or less ; calyx 

 6 lines long, the linear teeth longer than the campanulate tube ; corolla 

 yellow tinged with red, \\ inches long, funnelform, the rather broad 

 tube but little dilated above, the lobes broad, acute, 4 lines long : fila- 

 ments declined, inserted near the base of the tube, the dilated appen- 

 dage at the base pilose-bearded : capsule ovate, few-seeded, little 

 exceeding the calyx-tube. — On shaded ledges in the Sierra Madre, 

 Chihuahua ; C. G. Pringle (n. 1558), Oct., 1887. A true Polemonium 

 though peculiar in the form and color of the corolla. 



Ipomcea leptosiphon. Glabrous ; stems very slender, from a 

 narrow constricted tuber, branching and twining, 2 or 3 feet long: 

 leaves shortly petiolate, digitately divided, the divisions very narrowly 

 linear, 2 inches long or less and not \ line wide: peduncles 1 -flowered, 

 about equalling the petiole: sepals unequal, oblong-lanceolate, acutish, 

 the outer somewhat muricate, 4 or 5 lines long; corolla white or pink- 

 ish, nearly 4 inches long, funnelform with a long narrow tube: capsule 

 ovate-globose, nearly equalling the calyx. — In thin gravelly soil on 

 the foothills of the Sierra Madre, Chihuahua; C. G. Pringle (n. 1337), 



