8 PROCEEDINGS OF THE AMERICAN ACADEMY 



principal water-courses on this part of the route, all of which furnished 

 different remarkable species, were the Mora, Ocate, Colorado (the head 

 of the Canadian), and Rock Creek, all of which empty into the Cana- 

 dian. Rabbit's Ear Creek and McNees Creek (the head-waters of the 

 north fork of the Canadian) are east of the mountains altogether. 

 From thence the Cimarron was reached, where the Cold Spring, Up- 

 per, Middle, and Lower Spring, and Sand Creek are interesting local- 

 ities. On September 4th, Mr. Fendler recrossed the Arkansas, and 

 reached Fort Leavenworth on the 24th of that month. 



" The systematic enumeration of the plants collected by Mr. Fend- 

 ler, at this time presented to the Academy, extends to the close of the 

 Compositse (Nos. 1-462); and embraces the following new species, 

 viz. : — Thaliclrum Fendleri. Berberis Fendleri, a beautiful and 

 very distinct species, allied to B. Canadensis. Argemone hispida, — 

 also gathered by Fremont and Wislizenus, — allied to A. grandiflora. 

 Nasturtium sphcBrocarpum, a species with almost exactly globose sili- 

 cles, as its name indicates. Streptanthus micranthus, and S. lineari- 

 folius, Cardamine cordifolia, a species most resembling C. asarifolia 

 of the Old World. Sisymbrium incisitm, which has the pods of S. So- 

 phia, but with longer pedicels and much coarser foliage. Vesicaria 

 Fendleri, a very distinct species of a genus which appears to have its 

 principal focus in Texas and New Mexico. Lepidium alyssoides, 

 which was also found by Fremont. Drymaria sperguJoides, and D. te- 

 nella, two remarkable narrow-leaved species. Arenaria Fendleri, a 

 grassy-leaved species of a group not before found in the New World. 

 Sidalcea Neo-3Iexicana, and S. Candida, belonging to a new genus, 

 of which Sida diploscypha, Torr. 4* Gi'-, is the type. Ceanothus Fend- 

 leri. Dalea nana, Torr. ined., allied to D. aurea. Astragalus diphy- 

 sus, and A. cyaneus ; and four new species of Pliaca, viz. P. Fendleri, 

 P. gracilenta, P. macrocarpa, and P. picta. Calliandra herbacea, a 

 small, depressed herb. Mimosa borealis, a shrub, found north of lat. 

 37°, also gathered in flower by Mr. Gordon. Potentilla diffusa, and 

 P. crinita. (Enothera (Pachylopliis) eximia, the largest and most 

 striking species of the section, and apparently one of the handsomest 

 of the genus ; and CE. (Salpingia) Fendleri, also a very showy species. 

 The new Cactese are Mammillaria papyracantha, Cereus Fendleri, 

 and Opuntia plia;acantha, described by Dr. Engelmann, who has very 

 successfully investigated this family. Ribes leptanthum. Pliiladel- 

 plius microphyllus, a charming species. Archemosa Fendleri. Cy- 



