34 DAVKNPORT ACADKMY OF NATURAL SCIENCES. 



in length; young shoots pubescent, flowers small, fruit undistinguish- 

 able from A. pungeiis, and in thrifty specimens not essentially smaller. 

 It agrees well with a flowering specimen from Monterey labelled A. 

 pi/mila, Nutt. So that these two latter may be regarded as the coast 

 forms, while A. Nevadensis represents the extreme Alpine form of A. 

 pungens. 



Section 3. Xylococcus, Gray, 1. c. 



This brings us, in the natural series, to smooth-berried, solid-fruited 

 species, of which 



5. A. glaiica, Lindl., is the connecting link with the previous sec- 

 tion. While very similar, in some of its forms, to A. pungens, it is 

 readily distinguished by its glandular-hispid pedicels, its large, more or 

 less viscid fruit, scanty pulp, and smooth, soHd putamen, being quite 

 constantly five-celled, one or more abortive. It comprises some of the 

 largest shrubs of this genus, the following measurements being aflbrded 

 by a specimen on Mt. Diabolo, viz. : Lower trunk, 3 feet in height, 5 

 feet and i inch in circumference; height, 25 feet. 



6. A. hicolor, Gray. This characteristic southern species, which is 

 abundant in the vicinity of San Diego, and extends southward into 

 Lower California, forms a densely branched shrub, three to five feet in 

 height, with brown, shreddy bark ; leaves dull green above, whitish to- 

 mentose beneath, and strongly revolute, with entire margins ; flowers in 

 condensed racemes, white with a pinkish tinge; fruit often persistent 

 until second flowering, in February, smooth and shining, deep purplish- 

 red, four and one-half lines in diameter; copious and rather dense 

 granular pulp; putamen smooth externally,' solid, five-celled, one or 

 more abortive. 



7. A. Clevelandi, Gray. Closely allied to the above, has been col- 

 lected but once, in imperfect specimens, near the southern boundary 

 line. Though carefully sought at the original locality, it has not been 

 re-collected, and is not unlikely to prove a mountain form of the pre- 

 ceding {A. hicolor). 



Section 4. Comarostaphylis, Gray, 1. c. 



This section, with black, warty fruit and solid, five-celled putamen, 

 will include a Mexican species within the United Slates territory, lately 

 recognized as A. arguta, Zucc. It is probably the same as the one 

 mentioned in "Botany Mexican Boundary Survey," p. io8, as A- poli- 

 folia, H. B. K., from which it is quite distinct. 



