236 PROCEEDINGS OE THE AMERICAN ACADEMY 



rador, Maine, and Rocky Mountains, lat. 40°. In legumes of European 

 0. campestris, but not in the plant of Maine, I find a slight internal 

 projection of the dorsal suture; also, that the septum from the other 

 suture divides the cell, except when the legume is considerably inflated. 

 From the observations of Ruprecht, Ledebour, and others, it would 

 seem that 0. campestris^ argentata, and Uralensis all run together. 

 Equally they appear to run into the next in the Saskatchawan and 

 Rocky Mountain region. 



5. O. Lamberti, Pursh. 0. Hooheriana'^ Plattensis 8f sericea, Nutt. 

 in Torr. & Gray. Legumina coriacea, nunc fere cartilaginea, arrecta, 

 oblongo-cylindracea seu elongato-cylindracea (lin. 2-3 lata, longiora 

 poUicem longa), septo e sutura ventral! fere bilocellata. Flores 

 majusculi seu magni (8-12 lin. longi), spicati, purpurei, violacei, 

 ochroleuci, seu albi. Foliola plurijuga, lanceolata, oblonga, vel linea- 

 ria, cum calycibus canescenti-sericea. Stipulte plerumque hirsutissimse 

 seu lanatae.. — Plains of Saskatchawan to Texas and the Rocky Moun- 

 tains. I am unable to compare this with the Siberian 0. grandijiora. 



6. O. NANA, Nutt. in Torr. & Gray, 1. c. 0. argentata, Pursh. Fl. ? 

 non Pall. CiBspitoso-multiceps ; folia confertissima, magis cano-sericea ; 

 foliola 3 - 4-juga. Flores 9 - 12, capitati, majusculi. — Rocky Moun- 

 tains about lat. 40°, Nuttall ; and farther north on Little Blackfoot 

 River, Dr. Cooper ; in flower only. Legumes unknown. 



* * Foliola pleraque subverticillata. 



7. 0. SPLENDENS, Dougl. in Ilook. A well-marked and beautiful, 

 silvery silky-villous species. Plains of Nebraska to Bear Lake, and 

 west into the Rocky Mountains. 



§ 4. Montance. Legumen tenuiter coriaceum, oblongum seu cylindra- 

 ceo-elongatum, in calyce breviter vel brevissime stipitatum, sutura 

 ventrali late impressa (baud vero septifera) sub-semibilocellatum. 

 Caulescentes vel subacaules, pedunculis scapiformibus : stipulas 

 praesertim superiores basi tantum petioli adnatse : foliola crebra : 

 flores laete cserulei, spicati seu capitati, parvuli (tubo calycis brevi), 

 patentes ; leguminibus sjepius patentibus seu deflexis. 



8. 0. DEFLEXA, DC. 0. foliolosa, Hook., forma fere acaulis. — 

 Saskatchawan to the Rocky Mountains, as far south as about lat. 40". 

 (Fine specimens m Parry, Hall, and Harbour's collection, no. 120.) 

 The only species of this group yet detected in America. 



