160. 
Vaccinium 
1. Leaves not more than 1 cm. long, rounded at both 
ends; stem trailing; corolla cleft to below the 
middle, its lobes recurved. Expected (V. macro- 
carpon). 
1. Leaves 2-7 cm. long, acute at both ends (or some 
apically rounded in V. vacillans); stem erect; 
corolla shallowly cleft. 
2. Flowers subtended by leafy bracts much smaller 
than the foliage leaves, in panicles or racemes; 
anthers 2-awned on the back. (Also, leaf veins 
thinly puberulent on both sides; corolla white)..... V. stamineum 
2. Flowers not subtended by bracts, in small racemes 
or corymbs; anthers awnless. 
3. Leaves finely and sharply serrulate (also 
entire in V. corymbosum). 
4. Leaves narrowly elliptic, 2-3 cm. long, not 
over 1 cm. wide. Expected (V. angustifolium). 
4, Leaves broadly elliptic or ovate, 4-6 cm. 
long, 2 cm. wide or more. (Also, corollas 
pink; berries blue to black, glaucous)........ V. corymbosum 
3. Leaves entire, occasionally slightly serrulate 
near the apex. (Also, corolla usually pink to 
reddish, cylindric to urceolate; berry blue to 
black, 5-8 mm. dia). : 
5. Leaves elliptic to oval, the smaller lateral 
ones more circular; twigs often bright green. 
(Also, berry dark blue, faintly glaucous)..... V. vacillans 
5. Leaves all elliptic or ovate, acute; twigs 
dull green or brownish. 
6. Leaves very tomentulose beneath, especially 
on the veins; berries shiny black, not 
glaucous. 
6. Leaves sparsely puberulent or glabrous 
beneath; berries dark blue to blue-black, 
glaucous. 
