76 



RHAMNEJ:. 



* Leaves alternate, membranous or thin-coriaceous, glandular-toothed or 

 entire; fruit unappendaged or slightly crested. 



*- Branches 'flexible, not spinescent. 

 M- Leaves plane, glandular-toothed, except in n. 1. 



1. C. integerrimns, Hook. & Arn. Tall, loosely branching and some- 

 times arborescent, 512 ft. high, the branchlets green, more or less 

 angular when young, and warty in age: leaves ovate, 13 in. long, 

 prominently triple-veined, pubescent or glabrate, entire or'very slightly 

 glandular-serrate: thyrse long and dense, terminating leafy branchlets: 

 fl. from deep blue to white. One of the most common species of the 

 Coast Eange northward, but mostly beyond our limits. 



2. C. Yelutinus, Dougl. Stout, diffusely branching, 2 4 ft. high : 

 leaves subcoriaceous, broadly oval, \% 3 i Q - l n gi shining and thick- 

 glutinous above, more or less velvety-pubescent and strongly 3-ribbed 

 beneath; petioles stout, % in. long: thyrse compound, loose and broad, 

 rather short-peduncled : fl. white. Higher parts of the Coast Range, as 

 far south as Mt. St. Helena. June. 



3. C. thyrsifloms, Esch. Arborescent, 6 15 ft. high, glabrous or 

 nearly so, branches angular, foliage firm-membranous, bright and 

 shining; leaves 1 2 in. long, short petioled, ovate oblong, strongly 3-ribbed: 

 thyrse dense, sometimes broader than long, on short leafy peduncles: fl. 

 deep blue : f r. small, smooth. Frequent, preferring northward slopes 

 and cool ravines. 



M- -M- -H- Leaves pinnate-veined; margins glandular-toothed, undulate or 

 revolute; surface mostly papillose or rugose. 



4. C. Parryi, Trel. Arborescent, 610 ft. high; branches sparingly 

 villous or glabrate, angular, more or less papillose: leaves oblong, obtuse. 

 1 1% in. long, the pinnate veins supplemented by a pair of laterals 

 which run near the more or less strongly revolute margin; surface of leaf 

 glabrate, lower face more or less tornentose-canescent : thyrse narrowly 

 oblong, umbels subsessile: fl. blue: fr. small, smooth. In the hill- 

 country between Napa and Sonoma counties. May, June. 



5. C. papillosus, Torr. & Gray. Stouter than the last, less arbore- 

 ous, 46 ft. high; branchlets and stalklets hirsute-pubescent: leaves 

 narrowly oblong, 1 2 in. long, glandular-serrate, the surface rugose and 

 glandular-papillose: fl. blue, in short, mostly simple and short-stalked 

 racemes: fr. small, smooth. Hills along the seaboard. 



6. C. foliosus, Parry. Low, slender, the erect stems 2 3 ft. high, 

 with many ascending very leafy branches; nascent parts pubescent: 

 leaves subcoriaceous, often fascicled, glaucous beneath, deep but dull 



