BOTANY. 69 



0. Acetosella, Hook. Flor. Bor.-Amer. I, p. 118, in part. Flowers large, pink; whole plant 

 larger than 0. Acetosella, as it grows on the shores of Lake Superior. 



LIMNANTHACE^E. 



Limnantiies Douglasii, li . Br. in Lond. & Edinb. Philos. Mag. Jul//, 1833 ; Benth. Hort. 

 Trans. (2 ser.) \,p. 409. Shores of San Pablo hay; April. 



ANACARDIACE^E. 



Rhus diversiloba, Torr. & Gray, Flor. 1, p. 218. R. lobata, Hook. Flor. Bor.-Amer. 1, p. 

 127. Common throughout northern California ; more rare in the Klamath basin. Specimens 

 from Fort Reading; April, in flower, July, in fruit. Berries white ; called by the inhabitants 

 of California "poison oak." Several of our party were poisoned by it, and it also affected some 

 of our mules. 



ACERACE.E. 



Acer macrophyllum, Pursh. Flor. \,p. 267 ; Hook. Flor. Bor.-Amer. I, p. 112, t. 38; Nutt. 

 Sylv. 2, p. 76, t. 67. Cascade Mountains and Willamette Valley, 0. T. 



Acer circinatum, Pursh, Flor. 1, p. 266; Hook. Flor. Bor.-Amer. I, p. 112, t. 39. Willa- 

 mette valley, 0. T. 



Acer glabrtjm, Torr. Ann. Lye. Nat. Hist. N. York, 2, p. 172. Cascade mountains, 0. T. 



Acer tripartitum, Nutt. in Torr. & Gray, Flor. \,p. 247. Cascade mountains, 0. T. 



HIPPOCASTANACE.E. 



JEsculus Californica, Nutt. in Torr. &Gray, Flor. l,p. 251, dSylva, 2, p. 69, t. 64. Com- 

 mon throughout the valleys of California. In flower July 1st. 



CELASTRACE2E. 



Euonymus occidentals, Nutt. in Torr. & Gray, Flor. \,p. 258. Coast near San Francisco; 

 May, in flower. Very nearly allied to E. atropurpureus ; perhaps not distinct. 



RHAMNACE.E. 



Rhamnus PuRsniANUS, DC; Hook. Flor. Bor.-Amer. 1, p. 123, t. 43. 



Frangula Californica, Gray, Gen. Illust. 2, p. 178, & PI. Wright. 2, p. 28. R. oleifolius, 

 Hook. Flor. Bor.-Amer. 1, p. 123. R. laurifolius, Nutt.; Torr. &Gray, Flor. 1, p. 263. Fort 

 Reading ; July. Shore of Klamath lake ; August, in fruit. 



Ceanothus velutinus, Dougl. in Hook. Flor. Bor.-Amer. 1, p. 125, t. 45. Common in the 

 Cascade mountains, 0. T. The pubescence of this plant is very variable, and I have been 

 unable to distinguish it from 0. levigatus. 



Ceanothus thyrsiflorus, Esch.; Bot. Beg. 30, t. 38 ; Torr. & Gray, Flor. 1, p. 266; Nutt. Sylv. 

 2, p. 43, t. 57. Very common about San Francisco. 



Ceanothus prostratus, Benth. PI. Hartw. No. 1683. Pine woods in northern California ; 

 grows in a mat on the ground. 



Ceanotuus cuneatus, Nutt.; Torr. & Gray, Flor. 1, p. 267. Near Fort Reading ; July, in 

 fruit. 



Ceanothus integerrimus, Hook. & Am. Bot. Beech, p. 329 ; Benth. PI. Harliv. No. 1684. 

 Near Fort Reading ; July, in fruit and flower. 



