OP ARTS AND SCIENCES. 271 



acute teeth; petals purple, 2^ lines long, the banner spreading: pods 

 reflexed, glabrous, sessile, 1 -celled, thin-coriaceous, oblong or oblong- 

 ovate, turgid, obtuse, nearly 3 lines long. — By streams in the Sierra 

 Madre, Chihuahua; C. G. Pringle (n. 1220), Sept., 1887. Some- 

 what resembling A. flexuosus, but with much shorter pods. 



Brongniartia minutifolia, "Watson, var. canescens. Similar 

 to Dr. Havard's original specimens from western Texas, but canescent 

 with short appressed hairs and the stipules linear instead of oblong ; 

 a round bush, about 2 feet high. — Plains, at Orfiz, Chihuahua ; C. G. 

 Pringle (n. 1449), 1887. 



Brongniartia sericea, Schlecht. Valley of Mexico ; C. G. 

 Pringle (n. 1454), 1887. Agreeing with Schlechtendal's description 

 except in the fewer (2 or 3) peduncles and narrower bractlets. 



Desmodium (Heteroloma) Pringlei. Erect, herbaceous, tall 

 (4 or 5 feet), branching, the terete stem and branches and the long 

 petioles rough with rather dense short stiff hooked hairs : stipules 

 lanceolate, acuminate ; leaflets thin, broadly ovate to ovate-elliptical, 

 rounded or subcuneate at base, obtuse, 1^ to 3 inches long and nearly 

 as broad, thinly strigillose-villous on both sides : fruiting racemes 

 elongated ; bracts ovate, acuminate ; pedicels in pairs, widely spread- 

 ing, 6 to 9 lines long : pods 4-7 -jointed, the dorsal margin less deeply 

 notched than the ventral, the joints 2 to 3 lines long, densely uncinate- 

 pubescent. — In the shade on dry rocky ledges, Arroyo Aucho, in 

 the Sierra Madre, Chihuahua; C. G. Pringle (n. 1226), Oct., 1887. 

 Near D. strobilaceum. 



Desmodium (Heteroloma) Mexicanum. Perennial, herbaceous, 

 trailing, the angled stems and branches (3 or 4 feet long) hispid with 

 straight spreading and with shorter stiff hooked hairs : stipules lan- 

 ceolate, acuminate, villous ; petioles very short ; leaflets orbicular to 

 round-ovate, truncate or subcordate at base, thinly villous both sides 

 and ciliate (substrigillose above), the larger 2 inches broad : racemes 

 axillary and terminal, hooked-pubescent ; pedicels distant, in pairs, 

 spreading, about 6 lines long, the small bracts and broad calyx 

 somewhat villous : pods 3-7 -jointed, the sutures nearly equally in- 

 dented ; joints suborbicular, finely uncinate-pubescent, 2 lines long. — 

 On pine plains at the base of the Sierra Madre, Chihuahua ; C. G. 

 Pringle (n. 1227), Sept., 1887. Allied to D. molliculum. 



Cologania Pringlei. Perennial, with short procumbent slender 

 stems, the pubescence reflexed and hispid : leaves nearly sessile ; leaf- 

 lets small (the larger 6 to 10 lines long), obovate, rounded or sub- 

 retuse at the summit, glabrous above, sparingly appressed-hairy 



