110 CALIFORNIA ACADEMY OF SCIENCES. 



11. C. PAKViFOLius. C.integerrimus,\ax.'iparvifolius, Wat- 

 son, I. c. 334. — California to Oi'egon. 



■^**** Flowers blue or white: inflorescence mostly com- 

 pound and ample: leaves generally medium-sized 

 to large 3-nerved; margin various. 



-t- Twigs not spinose nor conspicuously glaucous, the 

 youngest angled in the first species: flowering- 

 branches few-leaved or leafless: leaves broad, usu- 

 ally large (25 to 75 mm. long): fruit about 5 mm. 

 in diameter. 



12. C. ARBOREUS, Greene, Bull. Cal. Acad. ii. 144. C. 

 sorediatus, Lyon. Bot. Gaz. xi. 204, 333. — Islands off the 

 Californian Coast. 



14. C. VELUTiNUS, Dougl. in Hook. Fl. Bot. — Am. i. 125, 

 pi. 45; Watson, I. c. 334. — British America to California, 

 Colorado and Nebraska, chiefly in the mountains. 



VAR. L^viGATUS, Torr. & Gray, Fl. i. 686; Watson, 

 Index, 167. — Ila}ige of the species. 



-h- -i- Twigs terete, often very divergent and rigid, some 

 of them ending in firm spines. 



-M- Twigs short, often very glaucous: leaves large in 

 the first, mostly medium-sized, rather small in the 

 last: fruit 4 to 6 mm. in diameter. 



14. C. INCANUS, Torr. & Gray, Fl. i. 265; Watson, I. c. 

 336. — California. 



15. C. EGLANDULOSUS. C. divaricakis, var. eglandidosus, 

 Torrey, Pac. R. R. Eep. iv. 75. C. divaricatus, Watson, 

 I. c. in part. — Mountains of California and Lower Cali- 

 fornia. 



