OF ARTS AND SCIENCES: NOVEMBER 11, 1863. 209 



Forma3 dune : a. pedunculosus, normalis, pedunculis folia subfequan- 

 tibus vel superantibus : /S. brachypds, pedunculis brevissimis vel 

 subnuUis. — Plains of Texas and Nebraska to the Rocky Mountains 

 and Hudson's Bay. Both forms are represented in Hall and Harbour's 

 collection, no. 131. The form ^3, from the withered corolla being car- 

 ried up on the apex of the growing legume, is perhaps precociously fer- 

 tilized. It seems doubtful if the root is perennial. Mature legumes 

 about an inch long ; when fresh or when dried without pressure the 

 impression of the back of the legume is manifest enough, although 

 shallower than in A. villosus, which is a true Astragalus ; while this 

 would be taken for a Phaca, 



§ 1 6. Argophylli. Legumen estipitatum (plerumque crasso-coriaceum 

 et obcompressum), sutura dorsali impressa vel intrusa ventrali 

 approximata pi. m. interstinctum, baud septato-bilocellatum, pu- 

 bescens. — Humiles, albo-sericei vel canescentes. Stipula3 dis- 

 cretJE, fere libertE. Flores spicati vel subcapitati, violacei vel 

 purpurascentes. Calycis dentibus tubo ssepius oblongo vel cylin- 

 drico brevioribus. 



* Multicaulis e radice annua vel bienni ; floribus parvulis albo-purpu- 



rascentibus. Legumen inflatum, membranaceum, incurvum. 



47. A. PUBENTissiMus, Torr. & Gray, Fl. l,p. 693. A. midticauHs, 

 Nutt. 1. c, non Ledeb. Nanus, pube laxa hirsuto-canescens ; foliolis 

 oblongis obovatisve ; floribus in pedunculo brevi paucis subracemosis ; 

 calycis dentibus tubo campanulato sequilongis ; legumine villoso mem- 

 branaceo inflato ovato-lunato valde incurvo dorso sulcato sutura leviter 

 inflexa uniloculari. — Colorado Territory, near the sources of the Col- 

 orado of the West ; found only by Nuttall. Legumes 9 or 10 lines 

 long, the ventral suture perhaps slightly, the dorsal mox-e deeply 

 sulcate-introflexed. 



* * Simpliciter caulescens e radice annua ; floribus mediocribus vio- 



laceis. Legumen rectum ? 



48. A. Arthu-Schottii, sp. nov. Pube appressa sericea undique 

 incanus ; caule (spithamteo et ultra) erecto ; foliolis 4 - 9-jugis obo- 

 vatis s£Epe retusis, pagina superiore interdum glabrata ; floribus in 

 pedunculo folium superante pluribus laxe spicatis ; calycis dentibus 

 subulatis tubo oblongo-campanulato vix dimidio brevioribus ; carina 

 majuscula subrecta vexillo pauUo breviore ; legumine juvenili oblongo- 

 lanceolato acuminato recto canescente e sutura dorsali semiseptato. — 



20* 



