118 THE BROAD-SCLEROPHYLL VEGETATION OF CALIFORNIA. 



ACERACE.E. 



41. Acer glabrum Torr. Dwarf maple. Southeastern Alaska to Montana, Colorado, 

 western Nebraska, New Mexico; west to California, where it ranges from the Oregon line 

 southward to northern Trinity County, throughout the middle altitudes of the Sierras, and 

 in the San Bernardino and San Jacinto Ranges. A mesophytic shrub, sometimes forming 

 an unimportant part of the conifer-forest chaparral. Deciduous. 



RHAMNACE^l. 



42. Rhamnus californica Esch. (including var. rubra Trelease and var. tomentella Brew, 

 and Wats.). Coffeeberry. Coast Ranges and Sierra Nevada, south to Mount San Pedro 

 Martir in Lower California. A frequent member of the climax chaparral, occurring also 

 in more mesophytic situations such as the oak forest. Var. tomentella extends eastward into 

 Arizona and New Mexico; var. rubra is deciduous, belonging rather to the conifer-forest 

 chaparral. 



43. Rhamnus crocea Nutt. (including R. ilicifolia Kellogg). Evergreen buckthorn; red- 

 berry. Siskiyou County southward in the Coast Ranges and Sierra Nevada, extending to 

 Mount San Pedro Martir in Lower California; eastward to Providence Mountains, Cali- 

 fornia, and into Mexico and Arizona. A frequent member of the climax chaparral. 



44. Ceanoihus cordulatus Kellogg. Snowbrush. Forested northern Coast Ranges and 

 throughout the higher Sierra Nevada forest regions; higher mountains of southern Cali- 

 fornia and Lower California to Mount San Pedro Martir; mountains of Nevada according 

 to Mrs. Brandegee (10). One of the most important constituents of the conifer-forest 

 chaparral, covering extensive areas pure or mixed with other species. As is natural, con- 

 sidering its successional status, it is also found abundantly as undergrowth in the coniferous 



45. Ceanothus crassifolius Torr. Santa Ynez Mountains to the San Gabriel and San 

 Bernardino Ranges, south to northern Lower California. An important constituent in its 

 range of the climax chaparral, conspicuous because of its grayish-green foliage. 



46. Ceanothus cuneatus Nutt. Wedge-leaf ceanothus. Omnipresent in the lower alti- 

 tudes of the California mountains; extending northward into southern Oregon and prob- 

 ably southward into Lower California. One of the three or four most abundant species 

 in the climax chaparral region. It comes up in great numbers after fire, and its presence 

 in abundance usually indicates recent disturbance. 



47. Ceanothus dentatus T. and G. Outer Coast Ranges from the Santa Cruz Mountains 

 to Santa Barbara County. 



48. Ceanothus divaricatus Nutt. (including var. eglandulosus Torr.). Monterey County 

 south to the San Bernardino Range, Cuyamaca Mountains, and Lower California; also 

 in the central and southern Sierras. An important shrub in the climax chaparral of the 

 southern California mountains. 



49. Ceanothus diversifolius Kellogg. Central Sierras, in the yellow pine belt. A creep- 

 ing shrub, growing beneath the pines, not forming brush. 



50. Ceanothus foliosus Parry. Coast Ranges north of San Francisco Bay, to the red- 

 wood region of Mendocino County. 



51. Ceanothus hirsutus Nutt. (including C. oliganthus Nutt.). Range uncertain; south- 

 ern Coast Ranges; perhaps southward into Lower California. 



52. Ceanothus incanus T. and G. Coast Ranges from Humboldt County to the Santa 

 Cruz Mountains, mainly in the redwood region. 



53. Ceanothus integerrimus H. and A. Deerbrush. Mount Shasta region, south in the 

 Coast Ranges to the Santa Cruz Mountains; lower yellow pine belt of Sierra Nevada; var. 

 puberulus (Greene) Abrams, in the mountains of southern California. According to Mrs. 

 Brandegee (10, p. 184), the species ranges southeastward to southern Arizona. An impor- 

 tant species in chaparral and as undergrowth in coniferous forest. Deciduous. 



54. Ceanothus megacarpus Nutt. Near the coast, Santa Ynez to Santa Ana Mountains. 



55. Ceanothus Palmeri Trelease. Ventura County to the Cuyamaca Mountains and 

 perhaps farther south. 



56. Ceanothus papillosum T. and G. Of limited range; Santa Cruz Mountains to Santa 

 Lucia Mountains. Grows in the Monterey region with an interesting group of endemics 

 and species of restricted range, including C. rigidus, Arctostaphylos hookeri, A. pumila, and 



A fjPstitd 



57. Ceanothus parryi Trelease. Coast Ranges; Napa and Solano Counties northward 

 to the redwood region of western Mendocino and Humboldt Counties. Deciduous. 



