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1. Rhus L. 



Poison-oak. Yedea. 



Polygamous. Calyx 5-parted, persistent. 

 Stamens 5. Ovary one, 1-celled. 1-ovnlate; styles 

 3. Fruit a dry drupe. 



1. E. DIVERSILOBA Torr. & Gray. Flowers 

 paniculate; petals greenish. Fruit pale. — ^? . 

 Common. Summer. 



2. P. AROMATICA Ait. Flowers spicate; pe- 

 tals yellow; fruit red. — ^. Livermore. Spring, 



Juice and exhalation of this shrub unlike 

 those of B. diversiloba do not produce eczema j 

 but are entirely harmless. 



Family 3. JUGLANDEiE. 



(Connecting link between Terebinthales and Ciqndiferoi.) 



Flowers diclinous. 6 : amentaceous ; peri- 

 gonium adnate to the bract, and imbricate in 

 aestivation; petals 3, or its multiple. ? : ag- 

 gregate or racemose; perianth connate with the 

 imperfectly 2-4-celled, 1-ovulate ovary; fruit 

 a 1-pyrenous drupe; pyrena of valvular dehis- 

 cence. Leaves imparipinnate, stipules 0. 



Juglans L. Walnut. 



6 : staixiens more than six. $ flowers: few, 

 terminal; calyx 4-parted; petals 4; style 2. — V . 



1. J. Californica Watson. — Very local. 

 Walnut Creek. Spring. 



