OP ARTS AND SCIENCES: MAY 30, 1865. 519 



Professor Gray presented the following paper : — 



Characters of some Neiv Plants of California and Nevada^ 

 chieflyfrom the Collections of Professor William H. Breiver, 

 Bota7iist of the State Geological Survey of California^ 

 and of Dr. Charles L. Anderson, ivith revisions of certain 

 Genera or Groups. By Asa Gray. 



The diagnoses of two or three of the following species, of the col- 

 lections of 1860-1862, have already been published in the Proceed- 

 ings of the California Academy of Natural Sciences, Vol. 3, pp. 

 101-103. The plants described are from the collections of the Geo- 

 logical Survey when not otherwise specified. 



Arabis (Lomaspora) platysperma : humilis e hasi suffrutes- 

 cente ; foliis cum caule pube stellata canescentibus spathulatis integer- 

 rimis, summis oblongis arete sessilibus obtusis ; racemo paucifloro ; 

 (petalis roseis;) siliquis arrectis rectisque lato-linearibus (l2--2| poll, 

 longis, lin. 2J- latis) acuminatis planis, valvis laxe reticulatis ; stigmate 

 sessili; seminibus amplissime alatis. — Sierra Nevada, on Mount Dana, 

 alt. 13,227 feet, and above Ebbett's Pass. 



Streptanthus poltgaliodes : Eucilsia, Dipterochlcena, glaber, 

 paniculato-ramosus ; foliis filiformibus integerrimis, nonnulis basi sub- 

 amplexante sagittatis ; racemis spicifbrmibus ; calyce luteo petala pur- 

 purascentia subeequante, sepalis duo exterioribus maxime dilatatis sub- 

 cordato-rotundatis, interioribus oblongo-Ianceolatis acuminatis ; siliquis 

 (immaturis) angustissime linearibus stylo brevi apiculatis. — On very 

 dry hillsides, in serpentine soil, along the Tuolumne River. A re- 

 markable species, with the petals, &c., of the Euclisia section, but, on 

 account of its peculiar calyx, rather to be distinguished as of a separate 

 section. The light-yellow and apparently scarious petaloid sepals are 

 of two very different shapes ; the inner pair nearly as in other species of 

 the genus ; but the outer much dilated, ajDparently nearly flat, and not 

 unlike the wings of some species of Polygala, about 3 lines in length and 

 breadth, and as it were enclosing the rest of the flower ; the tips of the 

 purplish or white and purple petals, and the oblong-sagittate blunt 

 anthers barely exserted. A pair of the filaments frequently connate. 

 The plant is probably an annual. 



Streptanthus procerus, Brewer. S. flavescens,\GT2iy, in Pro- 

 ceed. Amer. Acad. 6, p. 186, as to the "very large or luxuriant form 



