84 RHAMNEiE. 



12. C. iiiipressus, Trel. Proc. Calif. Acad. 2d ser. i. 112 (1888). Near the 

 last, but the leaves much broader, not papillose, though strongly rugose, 

 the midvein much depressed, the margin strongly revolute : inflorescence 

 dense, subglobose. — A little known species of some station southward in 

 the mountains toward Santa Barbara. 



13. C. (lentatus, T. & G. Fl. i. 268 (1838). Low and much branched, very 

 leafy, the branchlets and veins of the leaf beneath rusty-tomentose : leaves 

 crowded and fascicled, }.4 in. long or more, oblong-cuneiform, truncate or 

 retuse, the margins undulate and revolute : fl. deep blue, in nearly 

 simple slender-peduncled racemes, these very numerous and clustered at 

 the ends of lateral branchlets : fr. small, smooth. — Monterey and south- 

 ward. Apr. May. 



4— ■)— Branches spinescent ; flowers in simple chislers. 



•M- Leaves entire, triple-veined (except in the first). 



14.' C. spinosus, Nutt. in T. &. G. Fl. i. 267 (1838). Arborescent, 

 20 — 30 ft. high : branches lax, spreading, leafy and glabrous : leaves 

 coriaceous, shining, % — l^g in. long, oblong, obtuse or retuse, entire ; 

 petioles slender : fl. deep blue, very fragrant, in a thyrse or simple 

 raceme : fr. smooth, resinous, I4 in. thick. — Mountains towards Santa 

 Barbara and southward. The most arboreous of our mainland species, 

 though often merely shrubby. 



15. C. (Uvaricatus, Nutt. 1. c. 266. Eigidly and diffusely branched, 

 the branches spinescent and divaricate, nearly glabrous : leaves ovate to 

 oblong, }^ — 1^4 in. long, rounded at base, acute or obtuse at summit, not 

 tomentose beneath, entire or minutely glandular-serrulate : racemes 

 rather lax, often leafy : fl. blue or white : fr. of middle size, very 

 resinous. — In the Coast Range ; very common. 



16. C. incaiius, T. & G. Fl. i. 265 (1838). Spinescent branches thick 

 and stout minutely canescent, the foliage also cinereous-velvety and 

 pale : leaves coriaceous, tomentose beneath, broadly ovate or elliptical 

 obtuse, subcordate at base or somewhat cuneate, ^^ — 2 in. long : fl. 

 white, in short racemes from thick spurs or axillary branchlets : fr. 2 

 lines in diameter, resinous and warty. — In the Coast Range from Santa 

 Cruz Co. to Lake and Humboldt. 



17. C. cordulatus, Kellogg, Proc. Calif. Acad. ii. 124. fig. 39 (1863) : 

 C eglandnlosns, Trel. 1. c. 110 (1888). Low and widely straggling, pale- 

 cinereous and more or less hirsute : leaves oval or rounded, }4 — 13^2 in. 

 long, usually more or less cordate at base, entire or at apex serrulate : fl. 

 white in short clusters emanating from axillary rigid branchlets : fr. 

 small, not resinous-warty. — In the higher Sierra, and eastward in Nevada. 



HH- -M- Leaves triple-veined, glandular-serrate . 



