298 ERICACEAE. 
CALLUNA. Heather. 
(Family Ericaceae). 
Small shrubs: evergreen. Twigs 
very slender, terete: pith very 
small, roundish, continuous. Buds 
small, solitary, sessile, angularly 
globose, with about 3 _ scales, 
usually developing promptly. Leaf- 
scars opposite, minute, half-round 
or crescent-shaped: bundle-trace 1: 
stipule-scars lacking. Leaves 
small, V-shaped, grooved on the 
keel, closely overlapping in 4 
ranks except on elongated shoots. 
The winter-characters of Cal- 
luna vulgaris are indicated by 
Bosemann, 33. 
Heather, one of the most char- 
acteristic shrubs of European re- 
gions where soil sterility and 
mist meet, occurs in this country 
only along the northern Atlantic 
seaboard. 
Twigs puberulent: leaves glabrous. C. vulgaris. 
