262 PHANEROGAMOUS PLANTS. 



2. Frangula Purshiana. 



Rhamnus Purshianus, DC. Prodr. 2, p. 25 ; Hook. Fl. Bor-Amer. 1, p. 123, t. 43; 



Torr. & Gray, Fl. 1, p. 262 ; Nutt.^Sylv. 2, p. 52. 

 E. alnifolius, Pursh, Fl. 1, p. 166, non L'Her. 



Hab. Woods and declivities of mountains, around Puget Sound, 

 and in the interior of Oregon and Washington Territories ; also on 

 the upper tributaries of the Sacramento. — This species, in favorable 

 situations, becomes a tree twenty feet high. It is much more nearly- 

 related to F Caroliniana than to F. Californica, and it is clearly a 

 Frangula, although it is not enumerated among the species of that 

 genus by Dr. Gray. 



2. RHAMNUS, Town, 



1. Rhamnus croceus, Nutt. in Torr & Gray. 



Hab. On the Upper Sacramento, California. — A pretty evergreen 

 shrub, about 5 feet high. Leaves half an inch to 2 inches long, often 

 strongly and sharply toothed, usually of a light yellowish-brown 

 underneath, but sometimes (at least in dried specimens) of a copper 

 color. The berries are yellow [or bright red] when ripe. Pyrense 

 splitting by the ventral suture. A genuine Rhamnus. 



3. CEANOTHUS, Linn. 



1. Ceanothus prostratus, Bentlx. 



Ceanothus prostratus, Benth. PI. Hartw. p. 302 ; Torr. Bot. Whippl. p. 75. 



Hab. Mountains of the Upper Sacramento, California. — A trailing 

 evergreen shrub. Leaves variable in size, form, and in the number 

 as well as the length of the spiny teeth. The fruit has three erect 

 horn-like processes at the summit. 



