Vol. XVI, pp. 19-24 March 19, 1903 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



PSILOSTROPHE, A NEGLECTED GENUS OF 

 SOUTHWESTERN PLANTS. 



BY AVEN NELSON. 



The collections of Mr. Leslie N. Goodding, a student in the 

 University of Wyoming, made in southern Utah and Nevada 

 in the spring of 1902, are bringing to light some exceedingly 

 interesting xerophytic plants. Among these is a shrubby 

 Psilostrophe {Mklclellia), the study of which led to an inves- 

 tigation of the whole genus. 



The species formerly recognized are only three and one vari- 

 ety, and in spite of the remarkably heterogeneous mass of 

 material found in the genus, the three names have been made 

 to do duty for all that have been collected. The material found 

 in the Rocky Mountain herbarium seemed to indicate some 

 novelties, but to confirm these, Dr. J. N. Rose, Assistant 

 Curator, U. S. National Herbarium, made it possible for me 

 to examine the much larger series of specimens in that collec- 

 tion. For this favor I wish here to express my hearty thanks. 

 9— Pboc. Biol. Soc. Wash. Vol. XVI, 1903. (19) 



