68 THE FLORA OF THE ALPS 



serrate, leaf-stalk 2-3 times as long as the deciduous 

 stipules; stony woods, frequent. R. saxatilzs, L.; leaves 

 with short stalks, eUiptical, crenulate; stony hills, rare; 

 Zurich, Dauphiny. 



B. Leaves all alternate ; branches not spiny : — R. 

 Frangula, L. (Frangula Alnus, Mill), Alder Buckthorn ; 

 leaves elliptic, entire, branches spotted with white ; 

 thickets ; grown for the manufacture of gunpowder. R. 

 alpinus, L. ; calyx-teeth triangular, leaves ovate, acumi- 

 nate, crenulate ; a small erect shrub ; rocky alpine situa- 

 tions. R. carniolicus, Kern. ; resembling the last, but 

 leaves narrowly lanceolate ; Styria, Carinthia. R. pumi- 

 luSy Turn {rupestris, Scop.) ; calyx - teeth lanceolate, 

 acuminate, leaves lanceolate, nearly entire; a prostrate 

 shrub ; rocky alpine situations, local. 



Order XXVH.— TEREBINTHACE^. 



Flowers regular ; calyx-teeth 3-5, imbricate in bud ; 

 petals and stamens 3-5 ; fruit a drupe or berry. A small 

 order of chiefly tropical trees and shrubs, with a resinous 

 balsamic juice ; not alpine. 



I. Rhus, L. 



Calyx-teeth, petals, and stamens 5 each; styles 3; 

 fruit a drupe containing a single seed. 



R. CotinuSy L., Sumach; flowers in a loose terminal 

 panicle, petals yellowish, drupe brown when ripe, leaves 

 alternate, simple, entire; hills; Southern Switzerland, 

 Dauphiny, Pyrenees. 



