120 



ROSACEAE. 



Oebcocarpus. Mountain Mahogany. 

 (Family Rosaceae). 



Shrubs or small trees: ever- 

 green. Twigs terete, rather slen- 

 der, commonly forming dwarf 

 spurs closely covered by old leaf- 

 scars: pith minute, rounded. Buds 

 solitary, sessile, round, with 2 

 outer scales, quickly developing. 

 Leaf-scars alternate, minute, half 

 round, at top of the stipulate-base, 

 or transversely linear and low 

 with 3 bundle-traces after the fall 

 of this base. Leaves obovate, 

 flat and toothed, or lanceolate, re- 

 volute and entire. 



No one who has walked in the 

 western mountains in late summer 

 can have failed to have his atten- 

 tion drawn to one or other of the 

 species of Cercoparpus by the 

 clematis-like clusters of feathery 

 fruits that terminate its short 

 and from which the name of the genus has been de- 

 T^here is a marked contrast between the leaves of the 

 first two species and of the other two. 



1. Leaves toothed and nearly flat. 2. 



Leaves entire and very revolute, varnished. 3. 



2. Teeth rounded: Rocky Mountains. (-1). C. parvifolius. 

 Teeth pointed: California. (2). C. betulaefolius. 



3. Leaves minute (1X5 mm.), teretely revolute. 



(3). C. intricatus. 

 Leaves larger (25 mm. long), revolute at margin. 



(4). C. ledifolius. 



twigs 

 rived. 



