Bailey & Bailey: Woody Plants of National Parks 163 



Fig. 94. Alder buckthorn {Rhamnus alnifolia). 



often reddish; similar to alderieaf buckthorn except that bud scales are lacking 



and the flowers usually about 5 to 12 in a cluster; occurs in moist places in 



parks of the Southwest. 



Occurrence. — grand canyon, in the Canyon, 4,500 to 7,500 feet: Bright Angel 

 Trail; Kaibab trail; Hermit Creek; Roaring Springs; Bright Angel Canyon. 



4. Redstem Buckthorn, Sierra Buckthorn (Rhamnus rubra Greene 

 var. obtusissijna Jepson). — Shrub 2 to 5 feet high, with reddish twigs; leaves 

 elliptic to oblong, rounded at the tips, y^ to ly2 inches long, thinnish, with 

 prominent veins, not hairy except sometimes along the midribs and veins 

 below, the margins finely toothed; flowers small, greenish, borne in small clus- 

 ters in the leaf -axils; berries roundish, more or less constricted towards the 

 base, 1/4 inch long or less, becoming black. 



Occurrence. — YOSEMITE, 4,000 to 5,500 feet: Yosemite Valley; Helch Hetchy. 

 SEQUOIA, west wall of Kern Canyon at Chagoopa Falls, 6,500 feet. LASSEN. 



4a. Yosemite Coffeeberry (Var. yosemitana (Wolf) McMinn). — 



