VOL XVII, PP. 91-98 APRIL 9, I9C4 



PROCEEDINGS 



OF THE 



. 



BIOLOGICAL SOCIETY OF WASHINGTON 



NEW PLANTS FROM NEVADA. 

 BY AVEN NELSON. 



For two or three years past, Mr. F. Beveridge Kennedy, Pro 

 fessor of Botany, Nevada State University, has been very in 

 dustriously studying the flora of his state. While his attention 

 has been given to its economic aspects in particular, yet the her 

 barium he is building up must add much to our knowledge of 

 its species. He has very kindly permitted me, from time to 

 time, to study many of these collections. Among the choice 

 things secured there are several numbers that seem to be novel 

 ties. Following are the diagnoses as I make out them out. 

 Unless otherwise stated the types are deposited in the Rocky 

 Mountain Herbarium. 



Arabis pedicellata sp. nov. 



Perennial from a thick woody or sub-fleshy root; the base of the stem 

 also persisting as a caudex; caudex thick (1-2 cm.), leafless but rough 

 with the dense covering of the dead persistent petioles, in length from a 

 mere crown to nearly 1 dm. (according to the age of the plant); stems 

 one or more from the crown, lightly pubescent or nearly glabrous above, 

 stem proper or leaf-bearing portion but slightly surpassing the crown- 

 leaves; leaves canescent with a dense indument of soft stellately branched 

 hairs; those of the crown large and numerous, narrowly oblong or ob- 

 lanceolate, obtuse or subacute, often 1 dm. long, tapering into a much 

 11 PROG. BIOL. Soc. WASH. VOL. XVII, 1904. (91) 



