ERICACEAE 123 



4. Fruit black, not glaucous. G. baccata. 



Fruit blue, glaucous. G. baccata glaucocarpa. 



Fruit white or pink. G. baccata leucocarpa. 



ARCTOSTAPHYLOS. Bearberry. Manzanita. 

 Evergreen or deciduous low shrubs (as here considered) 

 with flaking bark; rather slender and angled twigs; somewhat. 

 3-sided homogeneous pith; alternate somewhat raised crescent- 

 shaped leaf-scars with 1 bundle-trace; no stipule-scars; com- 

 pressed ovoid small solitary buds with 2-4 exposed scales; 

 small simple- entire . (in some other species toothed) short- 

 petioled leaves; small perfect pink or white urceolate gamo- 

 petalous flowers in small racemes; and rather small red or 

 black berries. 



Trailing: leaves spatula te, glabrate. A. Uva-ursi. 



Bushy: leaves ovate or elliptical, tomentose. A. tomentosa. 



VACCINIUM. Blueberry. 



Usually deciduous shrubs with rather hard brownish wood 

 with minute diffused ducts and fine medullary rays; slender 

 angled twigs; small angular continuous 1 pith; alternate raised 

 small crescent-shaped leaf-scars with a single bundle-trace; no 

 stipule-scars; small ovoid buds with about 2 exposed scales; 

 characteristically oblanceolate rather small petioled leaves; 

 perfect open or bell-shaped gamopetalous whitish flowers; and 

 rather small inferior berries with small seeds. The first two 

 species (Cranberries) are often separated, as Oxy coccus. 



1. Evergreen: leaves small (under 2.5 cm. long). 2. 

 Deciduous: fruit black or glaucous. 5. 



2. Trailing slender vines: leaves very small (1 cm. long). 3. 

 Erect or more or less matted low shrubs. 4. 



3. Leaves white beneath: fruit under 10 mm. V. Oxycoccos. 

 Leaves less whitened: fruit over 10 mm. V. macrocarpon. 



4. Leaves pointed, serrulate: fruit blackish. V. Myrsinites. 

 Leaves blunt or notched, entire: fruit red. V. Vitis-Idaea. 



5. Leaves blunt, small (1.5 cm.): plant low. V. uliginosum. 

 Leaves acute, or else plants distinctly larger. 6. 



