476 RHAMNACEAE 



Dry rocky liills and canons, 10 to 2500 feet : near the coast from Santa Barbara 

 Co. to San Dieiio Co. J an. -Mar. 



Biol. note. — On the main trunks the bark dies above and below a shade-killed branch, result- 

 ing in deep longitudinal pockets. There develops also something of the "strand" effect seen in 

 Ceanothus cuneatus, due to the continuous thickening of the wood in longitudinal ridges. 



Locs. — Sycamore Canon, Santa Inez Mts., Jepson 9145; Mandeville Canon, Santa Monica 

 Mts., Epling ; Santa Cruz Isl., Jcpson 12,078 (a hornless variety) ; Santa Catalina Isl. (a horn- 

 less variety) ; Los Angeles, Davidson; Claymino Canon, Santa Ana Mts., Howell 2609 ; San Diego. 



Eefs. — Ceanothus megacarpus Nutt. N. Am. Sylva 2:46 (1846). C. macrocarpus Nutt,; 

 T. & G. Fl. 1:267 (1838), type loc. mts. near Santa Barbara, Nuttall; .Tepson, Man. 622 (1925) ; 

 not C. macrocarpus Cav. (1794). C. cuneatus var. macrocarpus K. Bdg. Proc. Cal. Acad. ser. 

 2, 4:205 (1894). 



24. C. greggii Gray. Desert Ceanothus. Very rigid and intricately branched 

 shrub 2 to 4 feet high; leaf -blades grayish-green, oblong to elliptical, acute at both 

 ends or obtuse at apex, entire or sometimes denticulate, puberulent on both faces, 

 4 to 6 lines long; flowers white; horns of the capsules small, often unequal or rudi- 

 mentary, spreading from the middle. 



Mountain slopes, 4000 to 8000 feet : ranges bordering the Mohave Desert and 

 the Death Valley region. East to New Mexico and south to Mexico. Mar.-May. 



Locs. — Gold Hill, Bear Valley, San Bernardino Mts., Parish 10,891; Cajon Pass, Parish 

 10,791; Cushenbury Sprs. (Erythea 7:93) ; San Emigdio, Eastwood; Tehachapi Mts., K. Bran- 

 degee ; Jackass Spr., Panamint Eange, J. Grinnell. Nevada: Charleston Mts., Purpus 6092; Mt. 

 Magruder, Purpus 5888. 



Var. perplexans Jepson. Shrub 2 to 5 feet high ; leaf -blades obovatish, very thick, spinulose- 

 dentate, yellowish-green, glabrous or puberulent above but minutely papillate beneath with mi- 

 nute whitc-flocculent dots, 3 to 4 (or 10) lines long; flowers white; capsules with 3 small spread- 

 ing horns borne on the middle of the lobes or sometimes none. — Dry hills, 3000 to 6000 feet: 

 ranges on west side of the Colorado Desert. 



Locs. — Campo, Parish 10,812 ; Monument Peak, Laguna Mts., Peirson 5939 ; Banner grade, 

 Cuyamaca Mts., C. V. Meyer 78; Warner Pass, Jepson 8533 (leaves less yellowish, 6 to 9 lines 

 long) ; Warner Ranch, e. San Diego Co., Jepson 8532 ; Palomar Mt., Muns 10,409 ; Vandeventer, 

 Santa Eosa Mts., Jepson 1464; Keen Camp, San Jacinto Mts., Mum 5448; Santa Ana Canon, 

 e. San Bernardino Mts., Hall 7506 (capsules hornless). 



Eefs. — Ceanothus greggh Gray, PI. Wright. 2:28 (1853), based on spms, from Buena 

 Vista, Mex., Gregg, and Frontera, N. Mex., Fendler; Jepson, Man. 622 (1925). C. verrucosus 

 var. greggii K. Bdg. Proc. Cal. Acad. ser. 2, 4:208 (1894). C. vestitus Greene, Pitt. 2:101 (1890), 

 type loc. Tehachapi, Greene. Var. perplexans Jepson, Man. 623 (1925). C. perplexans Trel. ; 

 Gray, Syn. Fl. l':417 (1897), type loc. "sw. Cal." 



25. C. pinetorum Gov. Kern Ceanothus. Low-spreading or erect shrub, 

 % to 1 or up to 4 feet high; leaf -blades orbicular to elliptic, pungently dentate all 

 around, shining and glabrous above, minutely flocculent beneath, I/2 to 1 inch 

 long; flowers blue, sometimes white, in dense umbellate clusters; capsules 3 to 4 

 lines broad with prominent stout horns 1 to 1% lines long. 



Mountain slopes and ridges, 6500 to 8800 feet : upper Kern River basin. June. 



Field note. — This shrub, Ceanothus pinetorum, is nearly related to C. greggii var. perplexans, 

 as represented by such collections of var. perplexans as those from the Banner grade, e. San Diego 

 Co. {C. V. Meyer 78), compared with C. pinetorum as it grows on Volcano Creek. It is the only 

 Ceanothus of the opposite-leaved group in the upper Kern Eiver basin. On the talus in Kern 

 Canon occur prostrate or procumbent forms not over one foot high, though elsewhere it is chiefly 

 erect. Below Coyote Pass it is abundant and it is common from Shotgun Creek to Lion Meadow 

 and Burnt Corral Meadow. 



Locs. — Volcano Creek, Jepson 963 ; East Fork Kern Canon, Hall 4" BahcocTc 5555 ; Coyote 

 Pass, Jepson 986; Hockett Mdws., Purpus 1438; Freeman Creek, Tulare Co., Jepson 4881; betw. 

 Cannell and Long mdws.. Hall 4" Bahcoch 5109 ; Olancha Peak, Hall 4~ BahcocTc 5272. 



Eefs. — Ceanothus pinetorum Cov. Contrib. U. S. Nat. Herb. 4:80, pi. 6 (1893), type loc. 

 Lion Mdw., Tulare Co., Coville 1738; Jepson, Man. 623 (1925). C. prostratus var. pinetorum 

 K. Bdg. Proc. Cal. Acad. ser. 2, 4:211 (1894). 



26. C. cuneatus Nutt. Buck-brush. Rigid divaricately and densely branched 

 shrub 4 to 14 feet high, with gray bark; branchlets stout and short, often very 

 unequal and interruptedly disposed; leaf -blades oblong- or euneate-obovate to 



