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late; fruit a 2-seeded samara. Leaves oppo- 

 site, imparipinnate, deciduous. — ^^ . 



1. N. Californicum Torr. & Gray. — San 

 Mateo. Marin County. Spring. 



Order 6. CELASTEALES. Parts of tlie 

 flower correspondent in number. Disc tumid, 

 adnate to tlie base of the calyx. Stamens in- 

 serted with the petals on the margin of the 

 disc. Ovules definite. 



Family 1. RHAMNACEJE. 



Calyx conspicuous, gamosepalous, valvat© in 

 aestivation. Stamens inserted with the jietals 

 and alternate with the calyx lobes. Ovarj^ 2- 

 3-celled ; cells 1-ovulate. Styles 2-3, more 

 or less connate. 



1. Rhamnus Juss. 



Calj^x-tube urceolate, margin 4-5-cleft. Pet- 

 als minute, with short claws, or 0. Ovary free. 

 Fruit a 2-3-pyrenous drupe. Leaves alternate, 

 stipulate. — ^ . 



1. R. CROCEA Nutt. Flowers -i-merous, ape- 

 talous; fruit red. — Lake Chabot. San Rafael. 

 Taylorville. Spring. 



2. R. Californioa Esch. Flowers 5-merous; 

 petals small, ovate, emarginate ; ripe fruit 

 black. — Common. Summer. 



" Cascara sagrada^' of the old Calif ornians. An 

 infusion of the bark of this species and of B. 



