204 PROCEEDINGS OF THE AMERICAN ACADEMY 



lanceolatis ; calycis dentibus filiformi-subulatis tubo parum brevioribus ; 

 leguminibus semi-ellqiticis raox glabris, stipite calycem bis excedente. — 

 Lake Winipeg to Bear Lake and the Rocky Mountains. — The legume 

 is correctly described by Hooker as " sutura hinc plana marginibus 

 paululum introflexis, illinc curvata " ; but in the plate the straight 

 suture is represented as the seminiferous one. Hence the erroneous 

 description in this respect in the Flora of North America. 



34. A. GLABRiuscuLUS, Gray, Enum. PI. Parry, Hall & Harbour, 

 no. IIG, in Proceed. Acad. Philad. March, 1863. Phaca glahriuscula. 

 Hook. 1. c. Glaber, vel pilis brevibus raris conspersus ; foliolis tenui- 

 oribus viridibus " lineari-lanceolatis subacutis" seu oblongis utrinque 

 obtusis ; ovario glaberrimo ; leguminibus lanceolato-subfalcatis in stipi- 

 tem calyce bis terve longiorem attenuatis : CMt. fere praecedentis. — 

 Valleys in the Rocky Mountains in British America, Drummond. 

 Also, var. major, near lat. 40°, at middle elevation. Hall and Harbour ; 

 with foliage resembling large forms of A. alpinus. Legume an inch, 

 stipe nearly half an inch long. 



++ ++ Legumen brevi-stipitatum, dorso baud vel obsoletissime sulca- 

 tum, sectione transversali obovata retusa, pube minuta subnigri- 

 cante. Foliola subretusa. Flores albi, parvuli (lin. 4. longi). 



35. A. RoBBiNSii, Gray, Man. Bot. N. U. S. ed. 2, p. 98. Phaca 

 Rohhinsii, Oakes in Hovey, Mag. Hort. 7, p. 181. Subglaber ; cauli- 

 bus pedalibus suberectis ; foliolis 3 - 5-jugis ovalibus oblongisve ; ra- 

 cemo compacto oblongo ; dentibus calycis tubo multo brevioribus ; 

 leguminibus tenuiter membranaceis oblongis rectis vel subincurvis 

 parvulis (semipollicaribus) obtusissimis basi in stipitem e calyce baud 

 exsertum subito angustatis. — Near Burlington, Vermont, in fissures 

 of limestone banks of the Onion or Winooski River ; the only known 

 habitat, discovered by Dr. Robbins. In this, as in the two preceding 

 species, the dorsal suture is not itself introflexed, but bears the rudi- 

 ment of a septum in the foi*m of a narrow and thin membrane project- 

 ing distinctly, but a very little way, into the cell. The present is a 

 connecting link between the foregoing and the following species. 



-J— -)— Legumen magis coriaceum, nigro- rariusve cinereo-pubescens, su- 

 tura dorsali sulcato-impressa pi. m. trigonum et semi-bilocellatum, — 



++ Subsymmetricum, breve, lentiformi-oblongum, compressiusculum, 

 sectione transversali obcordata, sutura ventrali paullo magis gib- 

 bosa. 



