68 RHAMNACEAE 



elongated, usually with a few leaves below ; flowers pale to deep blue, rarely nearly white ; capsule 

 about 3 mm. broad, slightly lobed, nearly smooth, somewhat viscid. 



Open woods and canyon slopes, mainly Humid Transition Zone; Coast Ranges from Douglas County, Ore- 

 gon, to Santa Barbara County, California. Type locality: California. April-June. 



8. Ceanothus griseus (Trelease) McMinn. Carmel Ceanothus. Fig. 3118. 



Ceanothus thyrsiflorws var. griseus Trelease in A. Gray, Syn. Fl. N. Amer. l^: 415. 1897. 

 Ceanothus griseus McMinn, Ceanothus 210. 1942. 



Erect shrub, 1-3 m. high with stout angled green branchlets. Leaves broadly ovate, obtuse 

 at apex, 1.5-4 cm. long, dark green and glabrous above, gray-tomentulose or silky beneath, veins 

 prominent on the lower surface, margins slightly revolute; flowers violet-blue, in dense panicles 

 2-5 cm. long ; capsule globose, about 4 mm. broad, glandular-viscid when young, becoming black 

 and shiny in age. 



Vicinity of the coast. Humid Transition and Upper Sonoran Zones; southern Mendocino County to northern 

 Santa Barbara County, California. Type locality: vicinity of Monterey, California. March-May. 



Ceanothus griseus var. horizontalis McMinn, Ceanothus 210. 1942. This is a low-spreading or prostrate 

 form growing "on the wind-swept bluffs above the ocean at Yankee Point, Monterey County, California," the 

 type locality. It is probable that environment rather than heredity accounts for the low growth of these plants. 



9. Ceanothus Parry i Trelease. Parry's Ceanothus or Lady-bush. Fig. 3119. 



Ceanothus Parryi Trelease. Proc. Calif. Acad. II. 1: 109. 1888. 



Ceanothus integerrimus var. Parryi K. Brandg. Proc. Calif. Acad. II. 4: 183. 1894. 



Low or arborescent shrub, 1-4 dm. high, the bark becoming grayish or reddish brown, branch- 

 lets slender, often elongated and weak, angled, pubescent. Leaves 1 . 5-3 cm. long, narrowly ob- 

 long to oblong-elliptic, glandular-serrulate to subentire, the margin revolute, upper surface dark 

 green, glabrous or sparingly pubescent, the veins more or less impressed, lower surface pale gray- 

 green and arachnoid-tomentose ; veins simply pinnate or lateral pair at base prominent ; panicles 

 simple or nearly so, rather narrow, 5-15 cm. long, usually on elongated leafy peduncles; flowers 

 violet-blue ; capsules only slightly lobed, smooth, 3-4 mm. broad. 



Mountain slopes and canyons, mainly Transition Zone; California Coast Ranges from Humboldt County to 

 Napa and Marin Counties. Type locality: originally described from specimens cultivated at Calistoga, California. 

 April-June. 



10. Ceanothus papillosus Torr. & Gray. Warty-leaved Ceanothus. Fig. 3120. 



Ceanothus papillosus Torr. & Gray, Fl. N. Amer. 1: 268. 1838. 



Ceanothus dentatus var. papillosus K. Brandg. Proc. Calif. Acad. II. 4: 203. 1894. 



Rather a loosely branching shrub, 1-2 m. high, the young branches terete, densely hirsutu- 

 lous. Leaves 2-5 cm. long, narrowly oblong to linear, the margins revolute, often strongly so, 

 dark green and more or less papillose on the upper surface, gray-green beneath and hirsutulous 

 or tomentose ; panicles mostly simple, narrow and densely flowered, 2-5 cm. long ; peduncles short 

 or sometimes elongated ; flowers deep violet-blue ; capsules 3-lobed with narrow crests. 



Open or partially shaded slopes, Upper Sonoran and Humid Transition Zones; California Coast Ranges, 

 especially toward the coast, from San Mateo County to San Luis Obispo County. Type locality: California. 

 Collected by Douglas. A form with the upper surface almost smooth, found on Kings Mountain in San Mateo 

 County, is C. papillosus var. regius Jepson, Man. Fl. PI. Calif. 618. 1925. April-May. 



Ceanothus papillosus var. Roweanus McMinn, Madrono 5: 13. _ 1939. Usually an erect-spreading shrub, 

 0.5-2 m. high, with short lateral branches densely clothed with foliage. Leaves narrowly oblong to linear, 

 1 . 5-5 cm. long, the margins strongly revolute, retuse at apex, upper surface densely glandular-papillose. Chap- 

 arral and borders of woods, mainly Upper Sonoran Zone; San Benito and Monterey Counties to Santa Barbara 

 County, and in scattering communities in Ventura, Orange, and western Riverside Counties, California. Type 

 locality: Mount Tranquillon, Santa Barbara County. 



11. Ceanothus impressus Trelease. Santa Barbara Ceanothus. Fig. 3121. 



Ceanothus impressus Trelease, Proc. Calif. Acad. II. 1: 112. 1888. 



Ceanothus dentatus var. impressus Trelease in A. Gray, Syn. Fl. N. Amer. U: 415. 1897. 



Low branched shrub, 5-15 dm. high. Leaves elliptic to nearly orbicular, 6—12 mm. long, 

 1 -veined from the base, upper surface deeply grooved over the midrib and the lateral veins, margins 

 strongly revolute and sometimes slightly glandular, appearing crenate, loosely villous, especially 

 on the veins beneath ; petioles 2-3 mm. long ; panicles mostly simple, narrow and densely flowered, 

 1.5-2.5 cm. long; flowers blue; capsule subglobose, about 4 mm. broad, with prominent lateral 

 crests. 



Low hills and sandy mesas. Upper Sonoran Zone; northwestern Santa Barbara County, California. Type 

 locality: "Santa Barbara County." March-April. 



Ceanothus impressus var. nipom^nsis McMinn, Ceanothus 219. figs. 12, 13. 1942. Leaves a little larger, 

 lighter green and less deeply grooved over the veins, and the margins less revolute. Sandy soils in the vicinity 

 of Nipomo Mesa, the type locality, San Luis Obispo County, California. 



12. Ceanothus dentatus Torr. & Gray. Dwarf Ceanothus. Fig. 3122. 



Ceanothus dentatus Torr. & Gray, Fl. N. Amer. 1: 268. 1838. 



Ceanothus dentatus var. floribundus Trelease in A. Gray, Syn. Fl. N. Amer. 1^: 415. 1897. 



Ceanothus dentatus var. Lobbianus Trelease, Proc. Calif. Acad. II. 1: 112. 1888. 



Low much-branched shrub, 1 m. or less high, the branchlets short, hirsutulous. Leaves small. 



