360 BOTANY. 



Cercocarpus ledifolius, Nutt. — Southern Sierras (330), I. c. p. 174. 

 " Mountain Mahogany." 



Potentilla glandulosa, Lindl., var. Nevadensis, Watson. — Kern 

 River, at 9,850 feet altitude (376), I. c. p. 178. 



Potentilla gracilis, Dougl., var. rigida, Watson. — In my specimens, 

 from head of Peru Creek, the leaflets are from l^-2£' long (243); /. c. p. 179. 



Potentilla Wheeleri, Watson (Proc. Am. Acad, xi, p. 148). — South- 

 ern Sierra Nevada, on Mount Olanche, at 8,200 feet altitude ; I. c. p. 179. — 

 Plate III, B. Plant about natural size. Fig 4. Flower, seen from above ; 

 5, seen from beneath; 6, vertical section of flower; all enlarged about 8 

 diameters. Fig. 7. A single pistil. 



Horkelia Californica, Ch. & Sch. — Santa Barbara (21, 19), I. c. p. 181. 



Horkelia purpurascens, Watson (Proc. Am. Acad, xi, p. 148). — "Col- 

 lected by Dr. J. T. Rothrock on the headwaters of Kern River, at 9,000 

 feet altitude. An unmistakable Horkelia, but like H. tridentata, inter- 

 mediate between the typical species and those of Ivesia, leaving it almost 

 impossible to preserve the latter genus distinct. Specimens of H. tridentata 

 have recently been found with decidedly deltoid filaments, showing that 

 this character niay fail even to be specific." To the above remarks I can 

 only add that in a flower of II. purpurascens I have found the distinction 

 between the subulate and filiform filaments to fail, as all were between subu- 

 late and deltoid, except two, which were rather deltoid, thus destroying the 

 shape of the filaments entirely as a specific character. The varying num- 

 ber of carpels in both genera is another fact indicating still further the 

 necessity of uniting Ivesia to this genus. I imagine that most American 

 botanists will continue to keep up the distinction between this genus and 

 Potentilla, whatever may become of Ivesia. I. c. p. 182. — Plate III, A. 

 Plant natural size. Fig. 1. Unopened flower-bud ; 2, expanded flower ; 3, 

 petals of flower removed and calyx laid open to show the character and 

 insertion of the stamens; all enlarged about 6 diameters. 



Ivesia santalinoides, Gray (Proc. Am. Acad, vi, 531, and vii, 339). — 

 Mount Pinos,' at 8,500 feet altitude, I. c. p. 183. 



Rosa Californica, Ch. & Schl. — Santa Barbara, and to an elevation 

 of 5,100 feet in the Coast Range (22, 228, 23), I. c. p. 187. 



