76 RHAMNACEAE 



capsule globose, 7-9 mm. broad, with 3 dorsal or subdorsal horns, without intermediate crests 

 but often roughened. 



Slopes of hills, Upper Sonoran Zone; along the Coyote River, Mount Hamilton Range, Santa Clara County, 

 California. Type locality: Madrone Springs road, above Coyote Creek. Jan.-March. 



33. Ceanothus fresnensis Dudley. Fresno Ceanothus. Fig. 3143. 



Ceanothus fresnensis Dudley ex Abrams, Bot. Gaz. 53: 68. 1912. 

 Ceanothus rigidus var. fresnensis Jepson, Man. Fl. PI. Calif. 623. 1925. 



Prostrate shrub, forming mats, 2-6 m. across, with few erect branches 2-3 dm. high, young 

 twigs tomentulose. Leaves opposite, 6-12 mm. long, oblanceolate to obovate, entire or the truncate 

 or rounded apex minutely few-toothed, firm-coriaceous and involute, tomentulose on both surfaces 

 when young, glabrate above in age ; umbels few-flowered, terminating short peduncles ; flowers 

 white or pale lavender; capsules about 5 mm. broad and 6 mm. high, the exocarp nearly smooth, 

 the horns subterminal and erect or spreading, slender, 1 mm. high. 



Dry ridges in open coniferous forests. Arid Transition Zone; western slopes of central and southern Sierra 

 Nevada, California. Type locality: Stevenson Mountains, Pine Ridge, Fresno County, California. May-June. 



Ceanothus arcuatus McMinn, Ceanothus 247. 1942. Low rigidly branched shrub, 3-6 dm. high and 6-12 

 dm broad with stiff grayish arching branches and brownish-tomentulose branchlets. Leaves opposite, oblanceo- 

 late to obovate or elliptic to oval, 6-12 mm. long, grayish green and minutely stngose above, paler beneath, 

 1-nerved from the base; flowers white or pale blue, in small umbel-like clusters; capsule globose, 3-6 mm. broad, 

 with slender suberect subapical horns, without intermediate crests. 



Open coniferous forests, Arid Transition Zone; western slopes of the Sierra Nevada from Plumas County 

 to Madera County, California. This species is intermediate between C. cuneatus and C. fresnensxs and is 

 probably of hybrid origin. Type locality: Robb's Peak, Eldorado County, California. 



34. Ceanothus pumilus Greene. Siskiyou Ceanothus. Fig. 3144. 



Ceanothus pumilus Greene, Erythea 1 : 149. 1893. 



Ceanothus prostratus var. profugus Jepson, Fl. Calif. 2: 479. 1936. 



Low spreading or prostrate shrub with stout rigid branches. Leaves opposite, 5-10 mm. long, 

 oblanceolate to oblong-obovate, entire or rather inconspicuously 2-3-toothed at the apex, green 

 and glabrous above ; pale beneath and sparsely strigose on the veins ; flowers blue, in few-flowered 

 umbels ; capsules 4-5 mm. broad, exocarp not wrinkled, the horns very short. 



Open coniferous forests and dry ridges, upper Transition and Canadian Zones; Siskiyou Mountains of 

 southern Oregon and northern California. Type locality: mountains near Waldo, Oregon. April-June. 



35. Ceanothus ramulosus (Greene) McMinn. Coast Ceanothus. Fig. 3145. 



Ceanothus cuneatus var. ramulosus Greene, Fl. Fran. 86. 1891. 

 Ceanothus ramulosus McMinn, Madroiio 5: 14. 1939. 



Shrub 6-15 dm. high with spreading or arching branches, usually with smooth grayish bark. 

 Leaves opposite, not crowded on the branches, variable but commonly obovate to broadly 

 elliptic or broadly oblanceolate, 6-20 mm. long, entire or usually with a few teeth near the obtuse 

 to truncate apex, glabrous above, canescent beneath ; flowers pale blue-lavender or nearly white, 

 in small-peduncled umbels; fruiting capsule 4-5 mm. broad, usually rather slenderly 3-horned 

 at the apex and sometimes somewhat wrinkled and ridged or crested between the horns. 



Dry rocky or sandy soils, mainly Upper Sonoran Zone; outer Coast Ranges from southern Mendocino 

 County to San Luis Obispo County, California. Type locality: "In the Coast Ranges only, and from Santa 

 Cruz Mts. Greene, to Mann and Napa Counties, Mrs. Curran, Dr. Parry." Feb.-Apnl. 



Ceanothus ramulosus var. fascicularis McMinn, Ceanothus 250. 1942. Erect shrub with rough brownish 

 bark Leaves rather crowded, appearing fascicled, narrowly oblanceolate, or on younger branches shorter and 

 broader usually entire; fruiting capsules with minute lateral or subapical horns or these sometimes otjsolete. 

 Coastal mesas of San Luis Obispo County to northwestern Santa Barbara County, California. Type locality: 

 La Purissima Mission, Santa Barbara County. 



36. Ceanothus rigidus Nutt. Monterey Ceanothus. Fig. 3146. 



Ceanothus rigidus Nutt. in Torr. & Gray, Fl. N. Amer. 1: 268. 1838. 



Ceanothus verrucosus var. rigidus K. Brandg. Proc. Calif. Acad. II. 4: 207. 1894. 



Low, much-branched shrub, seldom over 1 m. high, the main branches often arcuate-spreading, 

 young twigs rather stout and rigid, dark brown and minutely tomentose, with short internodes 

 and very leafy. Leaves opposite, cuneate-obovate, 6-15 mm. long, toothed above the middle oronly 

 at the rounded or notched truncate apex, or some of them entire, glabrous, dark green and shming 

 above, minutely tomentose in the sunken interstices beneath, and with a few short hairs on the 

 veins, thick and rather rigid ; flowers blue in few-flowered axillary umbels ; peduncles very short ; 

 fruiting pedicels stout about 1 cm. long ; capsules 5 mm. broad, scarcely lobed, the dorsal horns 

 very short. 



Low hills near the coast, usually in sandy soil. Upper Sonoran and Humid Transition Zones; Monterey 

 Peninsula, Monterey County, California. Type locality: "Bushy woods near Monterey, California. March- 

 April. 



37. Ceanothus gloriosus J. T. Howell. Point Reyes Ceanothus. Fig. 3147. 



Ceanothus rigidus var. grandifolius Torr. Pacif. R. Rep. 4: 75. 1857. 

 Ceanothus prostratus var. grandifolius Jepson, Man. Fl. PI. Calif. 624. 1925. 

 Ceanothus gloriosus J. T. Howell. Leaflets West. Bot. 2: 43. 1937. 



Prostrate shrub, the branches stout, conspicuously tomentose when young, becoming almost 



