412 RHAMNACE^. Ceanolhus. 



shoots occasionally ovate, 3-nerved, and serrate or dentate), rounded or subacute at base, 

 very obtuse to emargiuate, drying brown above, clear green beneath, coriaceous, soon nearly 

 or quite glabrous, about an inch long, their glabrous or appressed-pubescent petioles 2 to 4 

 lines long : peduncles 1 to 2 or 3 inches long, from the upper axils, floriferous for nearly 

 their whole length, aggregated into a large thyrsus (5 or 6 inches long and half as thick), 

 the upper part of which is quite leafless : flowers pale blue : capsules depressed, about 3 

 lines in diameter, scarcely lobed, smooth, crestless. — Nutt. in Torr. & Gray, Fl. i. 267 ; 

 Wats. 1. c. 337 ; Trelease, 1. c. 109 ; Parry, 1. c. 172; K. Brandegee, 1. c. 185, excl. var. — 

 California, in the Middle Coast Range. 



-1— 5. Leaves medium-sized or in C. incanus rather large, often thick, evergreen, 3-nerved, 

 sparingly serrulate or occasionally entire : inflorescence mostly compound, ample in the 

 first : twigs terete, frequently pruinose, often very divergent and rigid, some of them end- 

 ing in firm spines. 

 C. divaricatus, Nutt. Tall shrub, almost arborescent, with olive glabrous or variously 

 puberulent mostly very glaucous twigs : leaves ovate, the broader often slightly cordate, 

 obtuse or subacute, glabrous and glaucous to gray-tomentose, the upper surface mostly 

 darker, 4 to 10 lines long, short-petioled : inflorescence glabrate or velvety, mostly narrowly 

 oblong, dense, 2 to 3 inches long : flowers usually pale blue : capsules smooth, 2 to 2| lines 

 long, not lobed, scarcely crested. — Nutt. in Torr. & Gray, Fl. i. 266, 686 ; Wats. 1. c. 336 ; 

 Trelease, 1. c. Ill ; Parry, 1. c. 168. C. olujanlhus, var. hirsutus, K. Brandegee, 1. c. 197, in 

 part. — California, chiefly in the Southern Coast Range. (Lower Calif.) Along water- 

 courses at low altitudes, not forming thickets. The typical form, about Santa Barbara and 

 perliaps in San Diego Co., has the leaves gray-tomentose beneath and with a few marginal 

 serratures. A commoner form, with entire thick mostly glabrous very glaucous leaves and 

 often nearly white flowers, is var. kglanddlosus, Torr. Pacif. R. Rep. iv. 7.5 (C. eglanda- 

 losus, Trelease, 1. c. 110; C. spinosus, var. Palmeri, K. Brandegee, 1. c. 185, in large part). 

 The latter form passes to the inconstant var. grosse-serrAtus, Torr. 1. c, Trelease, 1. c. 

 Ill, with rather thick coarsely serrate-dentate leaves, especially on suckers and vigorous 

 shoots, and sometimes deep blue flowers. A few specimens of the species from Tehachapi, 

 with more ample inflorescence than usual and flowers seemingly white, may perhaps be 

 crossed with C. integerrimus, and what seems to be a hybrid with C. spinosus occurs about 

 Santa Barbara, Hubbij, and in the San Bernardino Mts., Parry, Engelmann. 



C. cordulatus, Kellogg. Low flat-topped shrub, with olive or brownish mostly puberu- 

 lent somewhat glaucous twigs : leaves elliptical to nearly round, sometimes cordate, very 

 obtuse, mostly denticulate especially near the apex, scarcely 6 lines long, green, or gray- 

 pulierulent beneath, the darker upper surface microscopically tomentulose to usually nearly 

 glabrous, the slender closely tomentulose petioles 1 or 2 lines long : inflorescence minutely 

 velvety, about an inch long, rather loose : flowers white : capsules about 2 lines in diameter, 

 soon smooth, slightly crested, evidently lobed at top. — Proc. Calif. Acad. Sci. ii. 124, f. 39 ; 

 Wats. 1. c. 337; Trelease, 1. c. Ill ; Parry, 1. c. 168; K. Brandegee, 1. c. 187.— S. W. 

 Oregon to S. California, chiefly in the Northern Sierras. (Lower Calif.) In dry soil, often 

 at higher altitudes than the last, forming thickets. Varying in foliage toward C. incanus, 

 the more tomeutose Oregon specimens, with more elliptical leaves, perhaps separable. 

 Specimens from Mt. Shasta, Brandegee, no. 8, have the fruit somewhat verrucose, as in 

 C. incanus. 



C. glaber, Trele.\se, n. comb. Small shrub with slender reddish at first sparsely and 

 minutely puberulent rather closely soft-verrucose twigs: leaves broadly ovate. 1 to 1^ inches 

 long, rounded or subcordate at base, very obtuse, the margin serrulate or denticulate, the 

 dull but slightly waxen upper surface drying dark, both faces with a few minute soft hairs ; 

 the petioles about 3 lines long : inflorescence sparingly puberulent, 2^ inches long : the 

 rather few flowers white : capsules 2 to 2^ lines in diameter, deeply indented, nearly crest- 

 less, smooth. — C. soredinfus, var. glabra, Wats. Bot. King Exp. 51. C. cordulatus Xi-elu- 

 finus, K. Brandegee, 1. c. 188. — East Humboldt Mts. of N. Nevada, Watson, no. 212, and 

 apparently Placer Co., California, Brandegee, no. 9. 



C. incanus, Torr. & Gray. Tall shrub, with at length olive or reddish pu])erulent or 

 glabrous very glaucous twigs : leaves because of their size seeming thin for the group, ellip- 



