OF ARTS AND SCIENCES : JUNE 11, 1867. 829 



bus obovatis spathulatisve ; floribus majusculis albis ; silicula ovata 

 puberula stylo gracili superata, loculis sub apice biovulatis. — High 

 Sierra Nevada ; on the gravelly ' divide ' between East Carson and 

 West Walker Rivers, April, Dr. C. L. Anderson. I have a small 

 fruiting specimen of this from Douglas's collection in the interior of 

 Oregon or California ; hence the name adopted for what appears to 

 be a very distinct new species. In the firmness of the leaves, the size 

 of the flowers, and the slender style (a line long and almost half the 

 length of the silicle) this approaches the Aizopsis section, but is a 

 genuine Leucodraha. Flowers as large as those of D. ciliata : sepals 

 oval, glabrous, half the length of the bright white petals. D. densi- 

 folia, Nutt., as to the published character comes near to our species, 

 but, from Nuttall's incomplete specimen kindly supplied by Mr. Du- 

 rand, I take that to be a form or near relative of D. glacialis, with long- 

 ish style. It is quite hirsute, even to the sepals, with 2 - 3-forked as 

 well as some simple haii's, and the petals appear as if they were pale 

 yellow : the cells of the ovary are 6-ovulate. 



Lepidium dicttotum : annum, tenellum, undique puberulura ; foliis 

 angusto-linearibus integerrimis subgramineis ; floribus (an semper ?) 

 apetalis tetrandis; siliculis subtiliter reticulatis subovatis apice subalato 

 profunde emarginatis pedicello piano erecto longioribus. — Nevada, at 

 Steamboat Springs, Horace Mann ; and in most sage-bush lands, Dr. 

 C. L. Anderson. Specimens only 3 inches high ; the grassy leaves 

 one or two inches long : racemes strict. Silicle 2 lines long, and with 

 a deeper notch than in those of L. lasiocarpum, Nutt. (in which, 

 moreover, they are widely spreading), also more puberulent and more 

 evidently reticulated. 



Cleomella obtusifolia (Torr. in PI. Wright. 1, p. 12), char, 

 suppletus : bracteis inferioribus trifoliolatis ; stipulis in criues solutis ; 

 calycis lobis setoso-fimbriatis, seta terminali prjelonga ; stipite gracil- 

 limo, fructifero in pedicellum paullo longiorem refracto ; stylo ovario 

 bis longiori ; capsula bicornuta ; seminibus la^vibus. — In sand, near 

 Soda Lake, June 1, 1861, J. G. Cooper ; branches, in flower and fruit. ' 

 The scarious stipules are cut up into what appears to be a conspicuous 

 tuft of bristles in the axil of the petiole ; and the sepals are similarly 

 but more sparingly crinite. Ovules 4 - 6 on each placenta. The 

 capsule is more strongly lobed than in any other species, the back of 

 each valve in well developed specimens being abruptly produced into 

 a divergent horn (3 lines long, nearly as long as the style) ; when the 



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