Nelson New Plants from Nevada. 173 



late, generally obtuse ; the stipules consisting of several rather long flattened 

 more or less persistent bristles ; flowers crowded on the branchlets, small ; 

 sepals nearly linear, short, aristate ; petals oblong, obtuse, 3-4 mm. long, 

 scarcely equalling the somewhat stouter pedicel; style slender, as long as 

 the fruit; fruit densely short-hispid or hirsute, about 3 mm. long, and some 

 what broader, the valves short-conical; seeds straw-colored when dry, 

 darker if wet, smooth, 1.5 mm. or less in length. 



The type was collected in the Mohave Desert, October 30, 1880, by Dr. 

 Geo. Engelmann who indicated it as a new species and the specimen in the 

 Missouri Bot. Gard. Herb, bears a herbarium name. Some one has penciled 

 upon the sheet the varietal name under which I describe it in full. It is 

 quite possible that it ought to be written Cleomella pubescens sp. nov. It 

 differs from C. obtusifolia in habit, pubescence, size of plant and flower and 

 in the narrow, simple (not laciniate) sepals. I would place here also the 

 following: C. A. Purpus 5562 and 6044 from southeastern Calif.; A. D. E. 

 Elmer 3629, Lancaster, Calif.; and sheet No. 5617 in the Engelmann Herba 

 rium. 



Sphaerostigma senex sp. nov. 



A small annual mostly less than 2 dm. high, white hirsute- villous through 

 out ; stem simple, diminishing gradually from the base ; leaves from oblong 

 to oval, irregularly dentate or crenate, diminishing uniformly from the 

 base upward, the lower short petioled,3-5 cm. long, inflorescence a crowded 

 somewhat drooping or secund spike; flowers white ; sepals lanceolate, 7-8 

 mm. long, equalling the calyx tube and about as long as the ovary ; petals 

 broadly oval or suborbicular, somewhat exceeding the sepals and about as 

 long as the filaments and style which are subequal ; capsule short-villous, 

 straight, linear, 12 mm. or more in length. 



Allied to S. Utahense but distinguished at once by the white flowers 

 which are quite different in their parts. Only one sheet of specimens 

 known to the writer and this deposited in the herbarium of the University 

 of Nevada. Collected by G. H. True at Pyramid Lake, Washoe Co., June 

 9, 1903. 



Zaushneria argentea sp. nov. 



Silvery-gray throughout, the pubescence short and loose, herbaceous 

 nearly or quite to the ground ; stems 2-3 dm. high, simple or with paired 

 slender branchlets from some of the axils; leaves lanceolate-oblong or 

 broader, generally widest near the middle and tapering to both ends, only 

 the midvein discernible, rather numerous, besides the paired leaves often 

 some fascicled ones in the axils (these representing the undeveloped branch- 

 lets); flowers few, in a short terminal raceme; calyx pubescent, its lobes 

 and the petals homochromous, subequal ; petals obovate, deeply bifid ; 

 stamens not surpassing the petals and the stigma barely exserted. 



If the venation of the leaves has any significance as a diagnostic character 

 (and from the examination of a number of specimens I am inclined to 

 think it is one of the best) this is an excellent species. Following Dr. 

 Greene's division (Pitt. 1 : 25) this falls in with Z. Cati/ornica in spite of its 



