1916. 



JEPSON : REGENERATION IN MANZANITA 



at the headwaters of Kohler Creek, and along the summit of Moraga 

 Ridge, where the species is associated with Knob-cone pine in a 

 characteristic habitat. The vitality of the species must be normally 

 very great. After the Mt. Tamalpais chaparral fire of early July. 

 1913, sprouts began to appear within four weeks, and in tw r o months 

 made an abundant showing. Two of my students, Wieslander and 

 Herbert, counted forty-eight sprouts in a square inch from the 

 crown of an individual of this species occurring on Mt. Tamalpais 

 in the area subject to the fires just mentioned. 





^r- 



Fig. 1. 



Arctostaphylos vestita. This species occurs on the Monterey 

 Peninsula in company with the Monterey pine, and on the mesa 

 east of Del Monte in the chaparral. It exhibits habits exactly similar 

 to Arctostaphylos glandulosa and forms heavy root-crowns. These 

 Monterey shrubs do not seem to be specifically, although they may 

 be varietally, different from the shrubs of Mt. Tamalpais, which are 

 taken as Arctostaphylos glandulosa. 



Arctostaphylos tomentosa. This species is well developed along 

 the Washington and Oregon coasts, and extends southward in typi- 

 cal form to the Mendocino coast. Within the limits of this range it is 

 well characterized by the long, somewhat scattered bristles of its 

 branchlets, in addition to a fine tomentum, which is rather close 

 and dense. It also occurs in Marin County, especially about Point 

 Reyes, and in the Santa Cruz Mountains, but within this portion of 

 its distribution — that is at its southern limits — it becomes difficult 

 to distinguish from Arctostaphylos glandulosa. There is however a 

 fundamental difference between the typical forms that, so far as 

 observed, is invariable — namely, as to their reaction to fire. Arcto- 

 staphylos tomentosa on the Mendocino coast is quite killed by fire, 



