Flore des serres et des jardins de l'Europe
Main features of the subsection :
Shrubs, epiphytic or scrambling over rocks ; young shoots hairy.
Leaves evergreen, often bullate above, lower surface covered with a relatively thick indumentum, scales distant, small. Inflorescence terminal, 2-3-flowered. Calyx well-developed. Corolla funnel-campanulate or campanulate, stamens 10, regularly arranged or declinate ; ovary densely tomentose, style declinate or sharply deflexed downwards. Seeds winged and finned.
SEE THE WHOLE 1998 CLASSIFICATION