PARRY CEANOTHUS. 1 69 



Group III. Sorediatus. 



Branches not spinose; leaves strongly triple-nerved, glandularly cre- 

 nate, usually densely tomentose beneath; flowers blue or white. 



12. C. sorediatus, Hook. & Arn. Foot-hills of the Sacramento 

 Valley. I am inclined to confine this species to the slender supple- 

 branched and sparse leaved shrub of the district above designated. 

 The leaves variable in size, 10-15 mm. in length, broadly ovate to sub- 

 cordate, densely white tomentose beneath, irregularly glandular-cre- 

 nate, short petiolate; stipules thicker than usual in this section; the 

 inflorescence on the terminal branches is of a more intense azure blue 

 than any species known to me. This is unquestionably the species 

 described by Dr. Kellogg, Proceedings California Academy of Sciences, 

 I., p. 55, as C. azureus. What has been generally referred to this 

 species from Southern California, is an arborescent form of C. hirsutus, 

 or possibly an undescribed species. 



13. C. arboreus, Greene, Bull. Cal. Acad., II., p. 144. Only 

 known on the islands off the Southern California coast. 



14. C. vehttinus, Dougl. Widely spread to the north and east of 

 the Sierra Nevada. 



15. C. hirsutus. Nutt. Coast ranges of Santa Barbara and south- 

 ward. This species needs a more careful field study than it has yet 

 received to verify Nuttall's original description — Fl. N. Am., I., p. 266 

 — till which time much doubt will attach to the various forms included 

 in herbaria from widely remote localities. As seen in the southern 

 coast range, what has been recognized as C. hirsutus is a tall shrub, 

 with tree-like trunk, and slender, minutely verrucose branches, not con- 

 spicuously hirsute ; the leaves very finely glandular serrate, deep green 

 above, pale and closely pubescent beneath; inflorescence terminating 

 in short, leafy shoots, oval, compact, of a dull purplish blue; fruit 4mm. 

 broad, distinctly three lobed, smooth and bluntly crested. C. oligan- 

 thus, Nutt., which has been referred to this species, should, from the 

 fruit character, be distinct, and the specimens from the Upper Sacra- 

 mento and East Humboldt Mountains must undoubtedly belong to a 

 very different and probably undescribed species. 



Group IV. Thyrsiflorus. 



Young branches angular; leaves oblong, conspicuously veined, either 

 triple-nerved or penninerved, usually tomentose beneath, more or less 

 revolute, glandular-serrate, or papillose glandular on the surface ; in- 



[Proo. D. A. N. 8., Vol. V.] 22 [February «, 1889.] 



