118 THE AZALEAS OF NORTH AMERICA 



Flower-buds with prominent rows of conspicuous long-stipitate glands at 

 apex; corolla glandular-pilose, not or slightly villose outside, the tube 

 abruptly expanded at apex; low stoloniferous shrub with simple or 

 little branched stems . . . . . R. atlanticum, p. 147. 



Flowers expanding after the leaves are fully developed; the flower-buds with 

 prominent rows of stipitate glands at apex, rarely quite glabrous. 

 Branchlets and leaves more or less strigose or pubescent; style usually 

 pubescent. 

 Calyx-lobes oblong to oblong-lanceolate, rarely short; corolla finely 

 villose; leaves usually large, 4 to 10 cm. long; winter-buds pubescent; 

 flowers appearing before the terminal buds are formed. 



R. oblongifolium, p. 150. 

 Calyx-lobes short, semi-orbicular to ovate; corolla villose and glandular- 

 pilose; leaves usually 2 to 6 cm. long; winter-buds glabrous or 

 pubescent; flowers appearing usually when the terminal buds are 

 forming. 

 Winter-buds with many (usually more than 15) aristate-mucronate 

 scales, usually pale with conspicuous dark margin; branchlets 

 bright red-brown, usually densely strigose, specially toward the 

 apex; leaves often pubescent beneath, particularly at the end of 



shoots, serrulate-ciliate R. senulatum, p. 153. 



Winter-buds with fewer (usually less than 15) obtusish or acutish, 

 usually pale brown scales; branchlets usually pale, strigillose, his- 

 pid or glabrescent; leaves glabrous, strigose on midrib beneath, 

 pubescent only in one rare variety . R. viscosum, p. 157. 



Branchlets and leaves glabrous or the leaves sometimes strigillose on mid- 

 rib beneath; style usually glabrous; winter-buds glabrous. 

 Corolla white or pinkish, tube glandular-pilose outside; leaves glaucous 

 beneath, generally obovate, acute or obtusish. 



R. arborescens, p. 166. 

 Corolla crimson, tube glabrous or nearly glabrous outside; leaves light 

 green beneath, elliptic to oblong-lanceolate, acuminate. 



R. prunijolium, p. 169. 



