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1. Rhus L. 
Poison-oaAK. Yepra. 
Polygamous. Calyx 5-parted, persistent. 
Stamens 5. Ovary one, 1-celled, 1-ovulate; styles 
3. Fruit a dry drupe. 
1. R. piversiropa Torr. & Gray. Flowers 
paniculate; petals greenish. Fruit pale.—». 
Common. Summer. 
2. P. aromarica Ait. Flowers spicate; pe- 
tals yellow; fruit red.— ). Livermore. Spring. 
Juice and exhalation of this shrub unlike 
those of R. diversiloba do not produce eczema, 
but are entirely harmless. 
Family 3. JUGLANDEZ, 
(Connecting link between Terebinthales and Cupulifere.) 
Flowers diclinous. 4: amentaceous; peri- 
gonium adnate to the bract, and imbricate in 
zstivation; petals 3, or its multiple. 2: ag- 
gregate or racemose; perianth connate with the 
imperfectly 2-4-celled, l-ovulate ovary; fruit 
a 1-pyrenous drupe; pyrena of valvular dehis- 
cence. Leaves imparipinnate, stipules 0. 
J uglans L. WaALnot. 
6: stamens more than six. ¢? flowers: few, 
terminal; calyx 4-parted; petals 4; style 2.— bh. 
1. J. Catirornica Watson. — Very local. 
Walnut Creek. Spring. 
