190 American Midland Naturalist Monograph No. 4 



Branchlets and leaf-stems without long spreading hairs, often finely hairy or 

 sticky-glandular. 

 Flower stems more or less sticky-glandular. 



Branchlets conspicuously glandular-hairy; berries very sticky-glandu- 

 lar; leaves whitish; common in Yosemite National Park 

 2. A. mariposa. 



Branchlets smooth, not conspicuously glandular-hairy or very finely so; 



berries smooth and glandular. 



Leaves whitish; stems of flower-cluster all sticky-glandular; 



branchlets and leaf-stems mostly smooth, not glandular; 



berries sticky-glandular or smooth; common in Sequoia 



National Park 3. A. viscida. 



Leaves green; only the main stems and branches of flower clusters 

 sticky-glandular; branchlets and leaf-stems mostly finely 

 glandular-hairy; berry smooth 4. A. palula. 



Flower stems and branchlets not glandular, very finely whitish- fuzzy. 



Leaves narrowly oblong to elliptic, sharp-pointed at the tip, % to 1]/^ 

 inches long; very young flower-bud clusters short, '/^ to y2 

 inch long, stoutish, roundish to egg-shaped or club-shaped; 

 occurs in parks of the Southwest 5. A. pungens. 



Leaves oblong to broadly elliptic or roundish, mostly rounded or 

 blunt-pointed at the tips; I to 2 inches long; young flower- 

 bud clusters slender, 1/3 to Ys ^^^^ long; occurs in Cali- 

 fornia parks 6. A. meiDu^^a. 



Plants with stems trailing along the ground; leaves bright green on both sides. 



Leaves mostly pointed at the tips with a short sharp point; not so narrowly 

 wedge-shaped at the base; berries often brownish-red; found in parks 

 of the Pacific slope 7. A. nevadensis. 



Leaves mostly rounded or blunt at the tips, wedge-shaped at the base ; berries 



bright red; wide-spread in Rocky Mountain and Northwest parks 



8. A. uva-ursi. 



1. Hairy Manzanita (Arctostaphylos columbiana Piper.) — Shrub 2 

 to 10 feet high, much branched; young twigs densely covered with white, stiff 

 hairs; leaves 1 to 2 inches long, grayish-green, hairy to nearly smooth, oblong- 

 egg-shaped, pointed at the tip, the margin smooth or very finely toothed; 

 flowers white, borne in short dense clusters at the ends of the stems, the 

 flower stalks hairy, sometimes glandular hairy; berry flattish, about I/4 inch 

 in diameter, light to deep chestnut brovwi; nutlets rough, distinct or more 

 or less united. (Syn. A. tomentosa Lindl. as to the parks.) 



Hairy manzanita is not common in the parks, although it occurs abund- 

 antly at lower elevations in the Pacific Northwest. The plants do not crown 

 sprout but are killed completely by fire. 



Occurrence. — OLYMPIC, occasional: l'/2 miles southwest of Windfall Peak, 3,000 

 feel; trail to Constance Ridge. MOUNT RAINIER, occasional: lower Stevens Canyon: 

 Ohanapecosh River. 



2. Mariposa Manzanita (Arctostaphylos mariposa Dudley). — Shrub 

 3 to 8 feet high with smooth dark reddish-brown bark; branchlets glandular- 

 hairy (dusty looking in var. bivisa) ; leaves elliptic to roundish, usually with 

 a short point at the tip, % to 2 inches long, smooth and whitish; flowers light- 



