OF ARTS AND SCIENCES: NOVEMBER 11, 1863. 231 



* * Condensati ; floribus e rosulis foliorum simplicium vix exsertis ; 

 legurainibus pluriovulatis subturgidis suturis validioribus marginatis. 



105. A. siMPLiciFOLius. Phaca simpUcifolia, Nutt. 1. c. Pulvi- 

 nato-caespitosus ; foliis lineari- vel spathulato-lanceolatis rigide acutis 

 saepius involutis sericeo-incanis ramos breves caudicis multicipitis dense 

 obtegentibus ; scapis brevissimis inclusis demum subexsertis ; calycis 

 glabrati dentibus tubo oblongo dimidio brevioribus ; corolla parvula 

 ochroleuca ; legumine calyce semi-incluso oblongo acuto subcompresso 

 glabro crasso-coriaceo, sutura veutrali recta acutissima, dorsali gib- 

 bosa. — Rocky Mountains of Colorado Territory near the sources of 

 the Platte, found only by Nuttall. — Legume four lines long, of thicker 

 texture and more turgid than in the preceding species, and with more 

 prominent sutural edges, but formed on the same plan ; the foliage also 

 similar. Ovules about 12. 



* * * Suhmonospermi, depresso-caulescentes ; floribus in axillis folio- 



rum subsessilibus ; leguminibus 3 - 4-ovulatis scepius monospermis 

 ovatis baud stipitatis. Pinnatifolii, paucifoliolati. 



106. A. Kentrophyta, Gray, Enum. coll. Parry, Hall, & Harbour, 



1. c. no. 106. Kentrophyta montana & K. viridis, Nutt. in Torr. & 

 Gray, 1. c. Intricato-ramosus e radice longa, late depresso-ceespito- 

 sus, undique foliosissimus, sericeo-canescens ; stipulis folium adversus 

 plerisque connatis ; foliis pinnato-3 - 7-foliolatis ; foliolis lineari-subula- 

 tis divaricatis rigidis mox involutis spinula terminatis cum rhachi baud 

 articulatis persistentibus ; floribus in axillis 1-3 parvis cteruleo-albidis 

 ochi'oleucisve ; legumine ovato acuminato compresso tenui-coriaceo ca- 

 nescente parvo (lin. 3 longo) bivalvi basi calyce brevi stipato suturis vix 

 marginato. — Colorado Territory, on both sides of the Rocky Moun- 

 tains, especially on the upper part of the Platte or Nebraska, in de- 

 nuded or sandy places. 



2. Folia quasi palmato-trifoliolata. {Phaca § Orophaca, Torr. & Gray.) 



§ 27. Triphylli. Legumen couico-ovatum, acuminatum, nee stipitatum 

 nee corapressum, coriaceura. pluriovulatum, calyce subinclusum, 

 sutura neutra intrusa. — Perennes, e caudice multicipiti lig- 

 nescente caespitosi, depressi, argenteo-sericei, confei'tifolii ; stipulis 

 majusculis tenui-scariosis adversus petiolum connatis ramos imbri- 

 cantibus. Folia simulate palmatim re vera pinnatim trifoliolata, 

 infima rarissime bijugatim o-foliolata, foliolis confertis. 



