172 REPORT OF AN EXPEDITION DOWN THE 



SALIC ACEiE. 



Salix longifolia, Muhl.; Carey in Gray r s Bot. N. St., p. 429. Yampai creek. 



Two other species of Salix, both apparently distinct from any in the Atlantic 

 States, occur in the collection, but they cannot be certainly determined, for 

 want of the flowers. 



Populus tremuloides, Michx. Fl. 2, p. 143; Michx. f. Sylv. 1, p. 125, t. 99, f. 

 c. San Francisco mountain. 



P. moniiifera, Ait.; Michx. f. Sylv. ], p. 116, t. 96, f. 2. On the Yampai and 

 Little Colorado. 



P. angmtifolia , James; Torr. in Ann. Lye. N. York, 2, p. 249. On the Zuni. 

 The leaves are broader than in the original specimens collected by Dr. James, 

 in Long ? s Expedition, being rhombic ovate. 



PLATAN ACEiE. 



Platanus .Mexica7ius, Moric. PL Var. d'Amer., t. 26. P. Californicus, Benth . 

 Bot. Sulph., p. 54. Santa Isabella, California; December; in fruit. The balls 

 of fruit are nearly an inch in diameter, and there are six on one stalk, in a long 

 raceme. 



CUPULIFERjE. 



Quercus Gambelii, Nutt. PI. Gamb. in Jour. Acad. Phil. (n. ser.) 1, p. 179. 

 San Francisco mountain; with mature fruit. A variety with the lobes of the 

 leaves more acute was collected on the Zuiii. Mr. Nuttall remarks that this 

 species approaches Q. oblusiloha in the leaf, but I think it more resembles Q. 

 alba. It is near Q. Douglasii, Hook, and Q. Hindsii, Benth. 



Q. oxyadenia: foliis ovatis subcordatis brevipetiolatis subcoriaceis, repando- 

 dentatis, dentibus mucronatis supra-pallidas viridibus glabrescentibus subtus 

 ferrugineo-pubescentibus cupula hemispherica, squamis arete appressis; glande 

 oblongo conica eiongata acutissima cupulam 4-5-plo superante. Santo Isabelle, 

 California. Leaves l|-2 inches long, probably evergreen, pale green and rather 

 dull above, clothed with a ferrugineous pubescence underneath; the veins pale 

 and very prominent. Scales of the cup ovate-lanceolate, rather obtuse, very 

 closely appressed, glabrous, and of a chestnut color. Glands about an inch 

 and a half long, tapering to a long sharp point. Allied to Q. agrifolia, but 

 differing in the form of the acorns, as well as in the size and outline of the 

 leaves. Nuttall, however, has represented his Q. agrifolia (in North Amer. 

 Sylv., pi. 2) with long-pointed acorns. 



