BUCKTHORN FAMILY 



475 



the summits of ridges and the divides with extensive thickets. In White Thorn Valley, southern 

 Humboldt Co., it has come in extensively in the last two decades in succession to the logged or 

 destroyed woodland. 



Locs. — Bull Creek, Tracy 6677; South Fork Eel Eiver near Eed Mt. Creek, Jepson 9418a; 

 Briceland, sw. Humboldt Co., Jepson 2149; Leggett Valley (n. of), nw. Mendocino Co., Jepson; 

 Jackson Valley, nw. Mendocino Co., Jepson 1863 ; Clarks ranch, nw. of Cahto, Mendocino Co., 

 Jepson; betw. Sherwood and Alpine, Jepson; Big Eiver headwaters, Jepson; Middleton grade, 

 Mt. St. Helena, Jepson; Little Sulphur Creek, Sonoma Co., M. S. Baker ; Lake Merced, San Fran- 

 cisco, Inez Bay Smith; Ben Lo- 

 mond, Santa Cruz Co., Berg fried 

 100 ; Glenwood, Santa Cruz Mts., 

 Michener 4" Bioletti; Felton, 

 Elmer 4253. 



Eef s. — Ceanothus incanus 

 T.&G.Fl. N.Am. 1:265 (1838), 

 type from Cal., Douglas (doubt- 

 less in the Santa Cruz Mts.) ; Jep- 

 son, Fl. W. Mid. Cal. 257 (1901), 

 ed. 3, 254 (1911), Man. 622 

 (1925). 



22. C. verrucosus Nutt. 

 Barranca Brush. Shrub 4 

 to 8 feet high; leaf -blades 

 roundish-obcordate or del- 

 toid-obovate, commonly re- 

 tuse or truncate at apex, 4 

 to 9 lines long, entire or 

 sometimes dentate or den- 

 ticulate along the sides, 

 green and glabrous above, 

 pale beneath; stipules 

 spreading horizontally, fi- 

 nally large and wart-like, 

 roughening the stems; cap- 

 sules 2 to 3 lines in diam- 

 eter, commonly hornless, 

 but variable, sometimes 

 with unequal or with rudi- 

 mentary horns. 



Sandy soil of low hills, 

 10 to 1000 feet : coastal San 

 Diego Co. South to Lower 

 California. Jan. -Apr. 



Locs. — Encinitas, K. Bran- 

 degee 91; La Jolla, Jepson 11,- 

 841; San Diego, Jepson 6673. Ceanothus verrucosus has been attributed to Pettit Canon, San 

 Luis Obispo. "We regard these shrubs as Ceanothus cuneatus Nutt. They resemble C. verrucosus 

 in their fruits, though no more in other characters than shrubs at many Coast Eange stations 

 which are undoubted C. cuneatus. 



Eefs.— Ceanothus verrucosus Nutt.; T. & G. Fl. 1:267 (1838), type loc. San Diego, Nut- 

 tall; Jepson, Man. 622 (1925). 



23. C. megacarpus Nutt. Big-pod Ceanothus. Shrub or tree-like with dis- 

 tinct trunk, 6 to 12 feet high; branches very slender; leaf -blades elliptic-obovate, 

 sometimes varying to cuneate, i/^ to 1 (or 1^4) inches long, thickish, entire or 

 rarely retuse or notched at apex, glabrous above, finely and closely tomentose be- 

 neath between the straightish parallel veins; flowers white; umbels 1 to several on 

 each short branchlet, only 1 to 3 flowers in each umbel setting fruit; capsules not 

 lobed, 3 to 5 lines broad, provided with stout diverging lateral horns. 



Fig. 



235. Ceanothus incanus T. & G. o, flowering 

 branch, X % ; 6, fl., X 4i/^ ; c, capsule, X 3. 



