BUCKTHORN FAMILY 71 



17. Ceanothus parvifolius (S. Wats.) Trelease. Small-leaved Ceanothus. 



Fig. 3127. 



Ceanothus intcgcrrimns var. parvif^orus S. Wats. Proc. Amer. Acad. 10: 334. 1875. 

 Ceanothus parvifolius Trelease, Proc. Calif. Acad. II. 1: 110. 1888. 



Shrub 6-12 dm. high, flat-topped with widely spreading branches and slender flexible terete 



branchlets, glabrous throughout. Leaves oblong, 1-2 cm. long, obtuse at apex, narrowed at base, 



plane and entire or obscurely 2-3-toothed at apex, bright green, deciduous ; inflorescence a simple 



narrow panicle, 2-4 cm. long, on slender naked peduncles ; flowers blue ; capsule 4—5 mm. broad, 



obscurely crested. 



Open pine forests, Arid Transition Zone; Sierra Nevada from Butte County to Tulare County, California. 

 Type locality: in the region of Yosemite Valley. May-July. Sweet Birch. 



18. Ceanothus integerrimus Hook. & Arn. Deer-brush. Fig. 3128. 



Ceanothus integerrimus Hook. & Arn. Bot. Beechey 329. 1839-40. 

 Ceanothus Andersonii Parry, Proc. Davenp. Acad. 5: 172. 1889. 



Shrub 1-4 m. high, widely branched, bark pale green, ultimate branchlets slender, flexible, 

 terete, glabrous or somewhat strigose-pubescent. Leaves 15^0 mm. long, oblong to narrowly 

 elliptic or narrowly ovate, entire, or on vigorous shoots obscurely toothed, bright green, glabrous 

 or nearly so above, usually sparsely strigose on the veins beneath, pinnately veined, or somewhat 

 3-nerved at base ; inflorescence a simple or few-branched panicle, 5-10 cm. long, on leafy pe- 

 duncles ; flowers white; capsules shallowly 3-lobed, slightly crested, otherwise smooth, 3.5-4.5 

 mm. broad. 



Mountain slopes and ridges, Arid Transition Zone. This is a polymorphic species with several fairly well- 

 defined varieties. The typical species inhabits the California Coast Ranges from Mendocino County to Ventura 

 County. The extreme narrow-leaved 1-nerved form {Ceanothus Andersonii') has been found recently in the 

 Sierra foothills near Rescue, Eldorado County. Type locality: California. Collected by Douglas. April-June. 



Ceanothus integerrimus var. puberulus (Greene) Abrams, Bull. N.Y. Bot. Card. 6: 409. 1910. {Ceano- 

 thus puberulus Greene, Leaflets Bot. Obs. 1: 66. 1904.) Leaves ovate-oval, obtuse, puberulent on the upper 

 surface, silky-pubescent beneath; flowers white. Mountains of southern California from Kern County to River- 

 side County. Type locality: San Bernardino Mountains. 



Ceanothus integerrimus var. califomicus (Kell.) Benson, Contr. Dudley Herb. 2: 120. 1930. {Ceanothus 

 californicus Kell. Proc. Calif. Acad. 1: 55. 1855; Ceanothus nevadensis Kell. Proc. Calif. Acad. 2: 152; fig. 

 45. 1862.) Leaves ovate to broadly ovate, acutish at apex, rounded or subcordate at base, glabrous or nearly so 

 above, sparsely pubescent on the veins beneath, prominently 3-nerved; flowers white. Cascades of Washington 

 to the North Coast Ranges and Sierra Nevada, California. Type locality; Placerville, Placer County, California. 



Ceanothus inteeerrimus var. macrothyrsus (Torr.) Benson, op. cit. 121. 1930. {Ceanothus thyrsiflorus 

 var. macrothyrsus Torr. Bot. Wilkes Exp. 263. 1874.) Leaves ovate to oval, obtuse or rounded at apex, more 

 or less densely pubescent on both surfaces; inflorescence a broad compound panicle, 10-20 cm. long, much 

 longer than the short peduncle; flowers blue, rarely white. Humid and Arid Transition Zones; Wasco County 

 and the Umpqua River, Oregon, to Siskiyou and Butte Counties, California. Type locality: "Banks of Umpqua, 

 Oregon." 



19. Ceanothus Palmeri Trelease. Palmer's Ceanothus. Fig. 3129. 



Ceanothus Palmeri Trelease, Proc. Calif. Acad. II. 1: 109. 1888. 



Ceanothus spinosus var. Palmeri K. Brandg. Proc. Calif. Acad. II. 4: 185. 1894. 



Arborescent shrub 2-4 m. high with smooth olive-green bark, branchlets ascending, terete, 

 rather slender and flexible, pale green, glabrous. Leaves evergreen, 15-35 mm. long, linear-ob- 

 long to oblong-lanceolate, obtuse or acutish, entire, rather light green above and shiny, pale 

 beneath, glabrous on both surfaces or sparingly strigose on the midrib beneath, 1-nerved; pan- 

 icles narrow, 5— S cm. long ; flowers white ; capsules 5—7 mm. broad with a thick wrinkled exo- 

 carp, crested with a roughened ridge. 



Open pine forests. Arid Transition Zone; Palomar and Cuyamaca Mountains, San Diego County, California, 

 to northern Lower California. Type locality: Cuyamaca Mountains, San Diego County, California. May-June. 



20. Ceanothus spinosus Nutt. Green-barked Ceanothus. Fig. 3130. 



Ceanothus spinosus Nutt. in Torr. & Gray, Fl. N. Amer. 1: 267. 1838. 



Arborescent shrub, 2-7 m. high, the bark smooth olive-green, the main branchlets mostly 

 ascending on the branch and flexible, glabrous, the ultimate ones usually divergent, short, rigid, 

 and spinescent. Leaves mostly oblong-elliptic, entire or, especially on young plants, toothed 

 toward the apex, glabrous or sparingly strigose on the midrib and petiole, bright glossy green 

 above, a little paler beneath, 1-nerved and finely pinnately veined; panicles compound, 3-6 cm. 

 long ; flowers bright or pale blue ; capsules 4-5 inm. broad, scarcely lobed, smooth, crestless, 

 slightly resinous. 



Mountain slopes and canyons. Upper Sonoran Zone; Coast Ranges of southern California, from San Luis 

 Obispo County south to Lower California. Type locality: mountains at Santa Barbara. March-April. 



21. Ceanothus sorediatus Hook. & Arn. Jim-brush. Fig. 3131. 



Ceanothus sorediatus Hook. & Arn. Bot. Beechey 328. 1839-40. 

 Ceanothus intricatus Parry, Proc. Davenp. Acad. 5: 168. 1889. 



Arborescent shrub, 2-4 m. high with smooth gray-green bark, rigid, divaricate somewhat 

 spinose, sparsely appressed-pubescent branchlets. Leaves 1-4 cm. long, elliptic-ovate to ovate, 

 obtuse to subcordate at base, finely glandular-serrulate, plane and firm, dark green, sparsely 



