Ceanothus. RHAMNACE^. 421 



C. arboreus, Greene. Small tree, with at first angled gray-puberulent at length glabres- 

 cent reddish and glossy twigs: leaves elliptic-ovate, subcordate or rounded at base, or 

 abruptly short-cuneate along the lateral nerves, mostly obtuse to subacute, dark green, dull 

 and glabrate or microscopically downy above, densely but microscopically white-tomeutose 

 beneath, U to 3 inches long; their stout canescent petioles 4 lines long: peduncles caues- 

 ceut : flowers pale blue : capsules subglobose or depressed, 4 lines in diameter, scarcely lobed, 

 wrinkled, strongly cristate. — Bull. Calif. Acad. Sci. ii. 144; Trelease, 1. c. 110, 115; Parry, 

 1. c. 169, 187; Brandegee, Proc. Calif. Acad. Sci. ser. 2, i. 208; K. Brandegee, 1. c. 192. 

 C. velutinus, var. arhoreus, Sargent, Gard. & For. i"i. 364, & Silv. ii. 4.5, t. 65. — Islands off the 

 Californiau coast, Sta. Cruz, Greene, Sta. Cataliua, Nuttall, Lyon, Davidson, Brandegee, 

 Fritchey, Mrs. Trask. 



■h- 4. Leaves medium-sized, rather thin, normally entire : inflorescence compound, elon- 

 gated, on few-leaved branches : fruit 2 to 3 lines in diameter. 



++ Twigs slightly angled when young, neither rigidly divaricate nor spiuose : leaves decid- 

 uous, at least the largest 3-nerved, mostly obtuse : inflorescence commonly rather dense. 

 C. parvifolius, Trelease. Slender and low, with olive glabrous flexible twigs: leaves 

 elliptical, acute at base, mostly mucronulate, glabrous, 4 to 8 lines long : inflorescence 

 oblong, subsimple, about an inch long ; the naked peduncle 2 or 3 inches long : flowers blue : 

 capsules 2| lines in diameter, nearly smooth and crestless. — Proc. Calif. Acad. Sci. ser. 2, 

 i. 110. C. integerrhniis, var. 1 parvijlorus, Wats. Proc. Am. Acad. x. 334. C. integerrimns, 

 var.? parvifolius, Wats. Bot. Calif, i. 102; K. Brandegee, 1. c. 183. C. integerrimns. Parry, 

 1. c. 172, in part. — California, in the Yosemite region. 



C. Andersoni, Parry. Tall shrub, with green or at length purplish glabrescent twigs : 

 leaves narrowly elliptical or elliptic-oblong, mostly acute at base, usually very obtuse, often 

 mucronulate, half inch to inch long: inflorescence from narrow to quite broad, 2 (when 

 simple) to 4 inches (when compound) long, or in fruit double this length, equalled by the 

 often nearly leafless at lengtli rather stout peduncles : flowers white : capsules nearly glo- 

 bose, 2 lines in diameter, lobed, smooth and crestless. — Proc. Davenp. Acad. v. 172. 

 C. integerrimns, K. Brandegee, 1. c. 181, in part. — Sta. Cruz Mountains, California. 



C. integerrimus, Hook. & Arn. Tall shrub with green or at length somewhat brown 

 glabrescent sometimes irregularly and sparingly low-verrucose rather stiff twigs : leaves 

 broadly elliptical to ovate, rounded at base, sometimes acute, somewhat loosely hairy above 

 at least when young, lighter green and glabrescent or with a few soft hairs beneath, 1 to 3 

 inches long, their very slender somewhat long-hairy petioles 3 or 4 lines long : inflorescence 

 3 or 4 to 6 or 7 inches long, 1 to 4 inches thick : flowers blue varying to white : capsules 

 sul)pyriform, 2^^ to 3 lines in diameter, somewhat lobed at top, nearly smooth, and with low 

 but broad deeply dorsal evanescent crests. — Bot. Beech. 329 ; Torr. & Gray, PI. i. 686 ; 

 Wats. 1. c. 334 ; Trelease, 1. c. 109 ; Parry, 1. c. 172, in part; K. Brandegee, 1. c. 181, in part. 

 C. Californicus, Kellogg, Proc. Calif. Acad. Sci. i. 55. C. Nevadensis, Kellogg, 1. c. ii. 152, 

 f. 45. C. thyrsiflorus, var. macrothyrsus, Torr. Bot. Wilkes Exped. 263. — Klikitat Co., 

 Washington, Suksdorf, to the Yosemite region, California; S. E. Arizona, Smart, Lemmon, 

 Palmer. No characters have as yet been detected by which the specimens from Arizona can 

 be separated, although far out of the usual range of the species. 



++ ++ Twigs usually angled, often twisted : leaves evergreen, rather firm or even cori- 

 aceous, most of them obscurely if at all 3-nerved : inflorescence lax. 



C. Palmeri, Trelease. Twigs green, glabrous, exceptionally glaucescent, neither rigidly 

 divaricate nor spinose : leaves elliptical or elliptic-lanceolate, rounded or subacute at base, 

 obtuse or emarginate, green, slightly glaucous on the lower surface, firm but rather thin, 

 soon nearly or quite glabrous, 1 to H inches long, their slender petioles 2 to 4 lines long: 

 inflorescence 2 to 3 or at length 6 inches long, the stout peduncle few-leaved below : flowers 

 white : capsules about 3 lines in diameter, somewhat roughened and narrowly crested. — 

 Proc. Calif. Acad. Sci. ser. 2, i. 109. C. integprrimus, Parry, 1. c. 172, in part. — San Diego 

 Co., California, about Cuiamaca, Palmer, Orcutt, Brandegee. 



C. spinosus, NuTT. Tall slirub or almost arborescent, with at length cinnamon-brown 

 more or less divaricate sparingly slender-spiny glabrous twigs : leaves elliptical (on vigorous 



