126 University of California Publications . [botanv 



previously reported only from the arid region southeast of San 

 Jacinto Mt., and from Lower California. 



Our plants are from one to one and one-half feet high, 

 scarcely" woody below and well adapted, by their small leaves 

 and tomentose pubescence, to the arid conditions under which 

 they exist. (No. 2326.) 



Chaenactis tenuifolia Xidf. 



Abundant in open places in the chaparral belt on Chalk Hill 

 and running over into the pine belt on all sides. It also occurs 

 along the lower edge of the pine belt on the west side of the 

 mountain. (Nos. 2036, 2056.) 



This species connects by intermediate forms with both C. 

 lanosa DC. and C. glahriuscula DC. but may usually be distin- 

 guished from either of those species l)y the small heads and 

 nari'ow inv(»lucral bracts. The extreme forms are very distinct. 

 Typical C. lanosa, collected at Kenworthy, is floccosely white- 

 tomentose and almost acaulescent even in old plants, the leaves 

 are basal and the scape-like peduncles 5-7 in. h)ng. The speci- 

 mens from Chalk Hill are fairly typical C. tenuifolia. The stems 

 are often over a foot high, early glabrate and branched only 

 above. The marginal corollas are sometimes much enlarged but 

 they are never so ampliate as in the extreme form of C. lanosa. 



Chrysopsis fastigiata Greene, Pitt. iii. 296 (1898); Parish 



Erythea vii. 97 (1899). 



Plentiful beneath the pines in Strawberry Valley and else- 

 where at the lower altitudes. (Xo. 844, 2607.) 



Corethrogyne filaginifolia Xuff. 



Collected in Strawberry Valley. (No. 2530.) 



Ericameria cuneata {Gray) McClatcJiie, Erythea ii. 124 (1894). 



Ajilopappus cmieatus Gbay. 



This persistent shrub grows from cracks in the rocks on steep 

 slopes facing the Colorado Desert, often at an altitude of 7000 ft. 

 It is not, however, a Transition species, since Sonoran conditions 

 prevail to that altitude on some of these slopes. The thick, 

 leathery leaves, covered with a glutinous balsam, adapt the plants 

 to the strong xerophytic conditions under which they exist; 

 otherwise the dry desert winds passing over that side of the 



