86 MADRONO [Vol. 1, 



Ranges and never comes down to the immediate vicinity of the 

 coast as does A. tomentosa. The latter has characters which dis- 

 tinguish it from A. canescens aside from the differences between the 

 two as to reaction to fire. 



A. tomentosa is a medium-sized dark green shrub; it has a 

 shallow root-system and its large single trunk is not enlarged at the 

 ground. It is killed outright by fire. A. canescens is a rather low 

 whitish shrub with numerous small rigid stems which arise from 

 an enlarged woody base or platform just at or below the surface 

 of the ground. It is highly resistant to fire and crown-sprouts 

 vigorously after a chaparral fire. While it has a very large woody 

 base, the stems which arise from this base are never, so far as ob- 

 served, over 1 or 2 inches in diameter. Further details of differences 

 between these two species are given in the organized diagnoses 

 below. 



Locs. — Iaqua Buttes, Tracy 4906; near Castle Peak, ne. 

 Mendocino Co., Jepson; Red Mt., n. Mendocino Co., Eastwood; 

 Blue Lakes grade to Ukiah, Jepson; Cobb Mt., Jepson; Mt. St. 

 Helena, Jepson; Howell Mt., Jepson; w. of St. Helena, Hood's Peak 

 Range, Jepson; Mt. Tamalpais, Jepson 6803; Loma Prieta (ace. 

 Eastwood) ; Santa Lucia Peak, Jepson 4744, 4745 (glabrate form) ; 

 Mt. Wilson, Peirson 141. 



Ref. — Arctostaphylos canescens Eastw. Proc. Cal. Acad, 

 ser. 3, 1:84 (1897), type loc. Mt. Tamalpais, Eastwood. 



17. A. glandulosa Eastw. is another species which has been 

 reduced to A. tomentosa Dougl. in the latest revision of this genus. 

 (N. Am. Fl. 29: 97 — 1914). It is a low shrub which crown-sprouts 

 under fire, the root-crown expanding horizontally as a result of 

 repeated fires and forming broad woody platforms from which arise 

 the very rigid erect stems. Its reaction to fire is very remarkable. 

 On a Mt. Tamalpais burn my student, Mr. W. C. Mathews, counted 

 47 sprouts on a root-crown in one square inch. It forms colonies of 

 a kind entirely different from A. tomentosa and with an entirely 

 different life-history. It also roots freely from decumbent branches. 



Locs. — Red Mt., Mendocino Co., ace. Eastwood; Ft. Bragg, 

 W. C. Mathews; Mendocino Range near Ukiah, Jepson 7640; Twin 

 Sisters Peak, Napa Range, Jepson 2391; Mt. Tamalpais, Jepson 

 5719, 5720; Berkeley, Harriet P. Kelley; Moraga Ridge, Jepson 

 5717; Oakland Hills, Jepson 7440 (berries a little glaucous); Las 

 Trampas Ridge, Contra Costa Co., Jepson; Sycamore Canon (head), 

 Santa Inez Mts., Jepson; Echo Mt., San Gabriel Mts., Peirson 142. 

 This species is variable and three varieties are here included under 

 it, namely — Var. vestita Jepson n. comb. (A. vestita Eastw.), a 

 shrub of the south coast with leaves densely tomentulose beneath : 

 Ben Lomond, K. Brandegee; Monterey, Jepson 2991, 4004; San 

 Simeon, K. Brandegee. Var. crassifolia Jepson n. var. Leaves 

 elliptic, thick, 8 to 12 lines long. — Del Mar, Jepson 1606a (type). 



(Cont. p. 88) 



