OF ARTS AND SCIENCES : NOVEMBER 11, 1863. 203 



tion, was first brought to light in llall and Harbour's recent collection, 

 no. 119. 



32. A. MICROLOBUS. A. gracilis, Torr. in Ann. Lye. New York, 

 2, p. 179 ; Nutt. in herb. Acad. & herb. Torr. 1838 ; Gray in coll. 

 Parry, no. 189, & coll. Hall & Harbour, no. 119. Caulibus subpe- 

 dalibus difFusis ; foliolis linearibus sen oblongo-linearibus emarginatis 

 (lin. 4-6 longis) ; racemis breviusculis sa^pius laxifloris ; floribus 

 saturate purpureis (lin. 4 longis) ; leguminibus reflexis crasso-cartila- 

 gineis puberulis tenuiter rugulosis turgidis, dorso tantum planiusculo, 

 sutura ventrali percrasso. — Plains of Nebraska, &c., to the Rocky 

 Mountains. — By the above characters flowering specimens of this may 

 be distinguished from the original A. gracilis ; and the species is con- 

 firmed by the legume, which is that of a Phaca, and in texture, &,c is 

 much like that of A. pectinatus on a very reduced scale. 



§ 14. Orohoidei. Legumen stipitatum vel estipitatum, coriaceum vel 

 fere membranaceum, vix aut ne vix obcompressum, sutura dorsali 

 nunc paullulum nunc profundius impressa vel introflexa plane uni- 

 loculare vel imperfecte bilocellatura. — Caulescentes, glabelli vel 

 pubescentes, graciles. Stipulaj praeter infimas discretfe, fere liberie. 

 Racemi sa^pe spiciformes breves, vel capitula pauciflora. Flores 

 parvuli vel mediocres, albo-violacei, purpurei seu albi, patentes ; 

 calyce brevi. 



* Veri, Boreales, e radice perenni adscendentes ; floribus pedicellatis 

 plerumque racemosis. Legumina oblonga, stipitata (in A. Oro- 

 boide et sparsijloro stipite brevissimo occulto), subsecunda, ssepius 

 pendula, sutura ventrali extus prominula. 



■i- Legumen membranaceum, glabrum vel tenuiter puberulum, latera- 

 liter compressiusculum, septo e sutura dorsali rudimentario angus- 

 tissimo uniloculare, ventre gibbosum, nempe sutura dorsali I'ecta 

 vel concaviuscula, ventrali arcuata. 



++ Legumen longe stipitatum, dorso nequaquam vsulcatum, sectione 

 transversal! ovali. Foliola nunquam retusa, infima stipulis ap- 

 proximata, nisi foliorum inferiorum. Flores in racerao compacto, 

 albi vel cajrulescentes, carina violacea. 



33. A. ABORiGiNUM, Richards, in App. Frankl. Journ. ed. 2, sub 

 nom. falso " ahoriginorum." Phaca ahoriginorum, Hook. Fl. Bor.-Am. 

 1, p. 143, t. 56. Canescenti-puberulus seu villosulus ;• caulibus adscen- 

 dentibus pedalibus rigidis ; foliolis 3 - 6-jugis linearibus seu oblongo- 



