VI. PLANT.E AVRIGHTIAN.E. 43 



A. NuTTALLiAMUs, DC] var. pube strigulosa subcanescens ; leguminibus arcuatis 

 nunc striguloso-hispidulis (ut in var. tricbocarpo) nunc cum ovario glabris. — Stony 

 hills near El Paso ; March, April. (1359.) — Plant about as large as Texan and 

 Arkansan specimens, but much more strigose-cinereous. 



A. NuTTALLiANUs, var. pumilus, etc. (G'mj/, PL Writjhf. p. 52); 2 - 3-pollicaris, 

 cset. ut in prsecedente ; leguminibus sa^pe cinereo-hispidulis. — Dry hills on the llio 

 Blanco, Piedra Pinta, and Pecos. Also at El Paso, and on Eake Gusman, Chihua- 

 hua ; April, May. (1001.) Some specimens with shorter pods pass into the next. 



A. NuTTALLiANUs'? var. pumilus, strigoso-canescens ; caulibus diffusis; legumini- 

 bus brevioribus. — Near Lake Santa Maria, Chihuahua; April. (1360.)* 



A. VACCARUM (sp. nov.) : perennis, strigoso-puberulus ; caulibus adscendentibus 

 gracilibus ; stipulis lanceolatis basi imo petiolo adnatis ; foliolis 5 - 8-jugis sub- 

 sparsis lato-linearibus obtusis mucronulatis supra glabris ; pedunculis folio longiori- 

 bus ; racemis multifloris dcnsis ; floribus brevissime pedicellatis mox deflexis ; 

 calycis dentibus subulatis tubo campanulato subajquilongis ; corolla incurva ochro- 

 leuca ; leguminibus hand stipitatis lineari-oblongis arcuatis puberulis dorso lato- 

 sulcatis (sectione transversali obcordata) bilocularibus oligospermis. — Ojo de Vaca, 

 west of the copper mines. New Mexico; Aug. (1002.) — Stems 1 or 2 feet high, 

 branched from the base, weak. Leaflets 6-8 lines long, a line and a half or less 

 in width, the pairs rather distant. Peduncles 3 -5, the spicate raceme one to two, 

 inches in length. Bracts subulate, persistent, as long as the calyx. Flowers only 

 2 lines long, smaller tlian those of A. gracilis, Niitt, and the corolla more incurved. 

 Legume 4 lines long, a line in diameter ; the cells 3 - 5-seeded. — This species re- 

 sembles A. Hartwegi, Benth., more than any other known to me ; but the incurved 

 flowers are only half as large, the stipules and leaflets are narrower, the latter 

 fewer, the racemes much shorter, «&:c. 



A. HUMISTRATUS (sp. nov.): subsericeus ; caulibus e basi suff"rutescente ramosis- 

 simis prostratis foliosis ; stipulis inter se coalitis oppositifoliis ; petiolo brevissime; 

 foliolis 7 - 9-jugis lineari-oblongis acutis supra glabratis subtus pilis laxe appressis 

 hirsuto-sericeis ; pedunculis folium sequantibus ; racemo cylindraceo subdensifloro ; 



* The following species was found near the copper mines by Dr. Bigelow, early in the season. It is 

 allied to Astragalus leptopus, Bcnth. ined., in Coulter's Mexican collection ; but has fewer and retuse 

 leaflets, smaller flowers, and smaller pods, which are obtuse at each end and not stipitate. 



Astragalus Cobrensis (sp. nov.): striguloso-puberulus ; caule humili gracili ; stipulis triangulatis a 

 petiolo modice elongato liberis ; foliolis 7 - 10-jugis obovatis oblongisve retusis supra glabris ; pedunculo 

 folium superante plurifloro ; calyce pedicello paullo longiore, dentibus subulatis tubo uicpiilongis ; legumi- 

 nibus baud stipitatis oblongis utrinque obtusis obcompressis glabellis dorso late concavis bilocularibus 

 polyspermis, sutura ventrali extus prominente. — Near the Cohre or cop|)er mines (Santa Rita del Cobrc), 

 New Mexico ; April or May. — Stems slender, a span high ; the root wanting in the specimen. Petioles 

 half an inch or more in length to the lowest pinna;. Leaflets 3 lines long, rather fleshy, strigulose-pubes- 

 cent when young, the upper surface early glabrate and the lower at length nearly so. Racemes loose, 

 10-15-flowered ; the flowers spreading, barely 3 lines long. Bracts shorter than the pedicels. Calyx 

 pubescent with dark hairs. Corolla purple. Legumes pendulous, half an inch long, 2 to 2^ lines wide 

 (contrary to the partition) ; the ventral suture salient ; the dorsal face broadly concave ; the partition ex- 

 tending quite to the ventral suture, but not coherent with it. 



