KEY TO THE ASIATIC SECTIONS OF THE SUBGENUS 21 



Stamens unequal, sometimes declinate; corolla rotate-campanulate. 

 Corolla rose-purple to magenta; style glabrous, villose or lepidote or both; 

 leaves with long scattered hairs when young, glabrescent at maturity; 



fruit cylindric, furrowed R. reticulatum, p. 83. 



Corolla white; style glabrous; leaves densely ciliate, short-villose, at least 



on midrib at maturity; fruit cylindric, terete R. quinquefolium, p. 87. 



Leaves broadly obovate; corolla pink; style glandular; fruit oblong-ovoid, 



verruculose R. Schlippenbachii, p. 88. 



SECT. III. RHODORA G. DON 



Corolla rotate-campanulate. 



Leaves obovate to oblong-oblanceolate, pubescent below; flowers 3 to 6, ma- 

 genta; fruit conic-ovoid, bristly glandular R. Albrechtii, p. 91. 



Leaves elliptic to narrow-elliptic, glabrescent; petiole bearded; flowers 1 or 2, 

 bright rose-pink; fruit spindle-shape, glabrous, verrucose 



R. pentaphyllum, p. 92. 



Corolla campanulate, white; leaves obovate to panduriform, subsessile with scat- 

 tered, bristly hairs; fruit oblong-ovoid, verruculose, with thin valves, wavy 

 at the margin when open R. nipponicum, p. 93. 



SECT. IV. PENTANTHERA G. DON 



Corolla wide-funnel-form, non-glandular. 

 Stamens as long as the yellow corolla; leaves softly pubescent, often canescent; 



winter-buds velutinous R. molle, p. 95. 



Stamens shorter than the orange- or flame-red, rarely yellow corolla; leaves 

 glabrous except on the veins beneath; winter-buds glabrous 



R. japonicum, p. 99. 

 Corolla tubular with spreading lobes, glandular R. luteum, p. 103. 



