Obd. 20. ANACARDIACE M. 



1. RHUS, Linn. 



1. Rhus Toxicodendron, Linn. 



Hab. In the Valley of the Upper Columbia, Washington Territory 

 (the upright variety, with the leaves entire or only slightly toothed) : 

 also in California (the climbing form, with toothed leaves). 



2. Rhus glabra, Linn. 



Var. occidentalis : foliolis 9-11 lanceolato-oblongis argute serratis ; 

 calyce fetalis sub-climidio breviore; antheris linear i-oblongis. 



Hab. Banks of rivers, near Fort Okanagan and Fort Vancouver; 

 also on the Kooskooskee, Washington Territory. — This plant differs 

 from B. glabra of the Atlantic States, in the less numerous and 

 scarcely glaucous leaflets, in the small pedunculate panicle, and in 

 the flower. The calyx in B. glabra is nearly as long as the corolla ; 

 the anthers are ovate, and not more than half as large as in the 

 Oregon plant. These differences, however, may not be constant, and 

 they can hardly be regarded as specific. — Dr. Gray (Plant. Fendl. p. 

 28) thinks it probable that, as the species of Rhus are all more or 

 less polygamous, the difference between this plant and the ordinary 

 form of B. glabra may be owing to sex. 



3. Rhus trilobata, Nutt. in Torr. & Gray. 



Hab. Mountain sides, Northern California. — This species takes the 

 place of the nearly related R. aromatica in the Pacific States and 



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