ROSACEA 



507 



sometimes rusty brown on the lower surface, |'-2^' long, and i' wide, with slightly 

 thickened revolute margins, broad midribs, 4-6 pairs of conspicuous primary veins 

 and reticulate veiulets; their petioles broad, channeled, i' to nearly i' long; stipules 

 lanceolate, acuminate, apiculate, 1'-^' long. Flowers on slender hairy pedicels, 

 usually in 2 or 3-flowered clusters \' long; calyx-tube slender, hoary-tomentose on 

 the outer surface, with a narrow obtusely lobed limb. Fruit : mature calyx-tube 

 spindle-shaped, light chestnut-brown, slightly puberulous, deeply cleft at the apex, 

 i'-|' long; akene more or less conspicuously sulcate on the back, covered with long 

 white hairs; style often 4'-5' in length. 



A bushy tree, with aromatic leaves and branches sometimes 20-30 high, with a 

 trunk rarely more than 10' in diameter, slender rigid upright branches, and branch- 

 lets clothed at first with pale silky pubescence, soon glabrous, rather bright brown 

 and marked b}' occasional oblong light-colored lenticels during their first year, be- 

 coming dark gray or brown and covered with conspicuous ring-like leaf-scars. Bark 

 about ylg' thick, generally smooth, divided by narrow shallow fissures and broken 

 into small square persistent red-brown scales. Wood light red-brown, with thin 

 light brown sapwood of about 20 layers of annual growth. 



Distribution. Mountain ranges of the arid portions of western North America 

 from western Nebraska to the northern slopes of the Siskiyou Mountains, Oregon, 

 and to western Texas and northern New Mexico; common on the California coast 

 ranges southward to the San Jacinto Mountains; on Santa Cruz Island, California, 

 and on the mountains of Lower California. On the California coast ranges frequently 

 with rather larger fruit and larger and proportionally broader often glabrous leaves 

 (var. betuloides, Sarg.). 



3. Cercocarpus ledifolius, Nutt. 



Leaves narrowly lanceolate, acute at the ends, apiculate, entire, with thick re- 

 volute margins, coriaceous, reticulate-veined, usually puberulous while young, at 



\k^.^20 



maturity dark green, lustrou^and glabrous on the upper surface and more or less 

 coated with pale or rufous pubescence on the lower surface, resinous, ^'-1' long, and 

 l'-^' wide, with broad thick midribs deeply grooved on the upper side, and obscure 



