Calyx lobes ciliate, persistent; corolla sympetalous, cylindrical, the lobes straight, spreading or recurved, mostly valvate in bud, occasionally imbricate.
Calyx of imbricate lobes (0); calyx of valvate lobes (1) 41.
Anthers adnate to style head; corolla-lobe aestivation in bud typically dextrorse (overlapping to the right) or valvate, rarely sinistrorse; fruit dehiscent, almost always apocarpous, a pair of follicles, sometimes reduced to one by abortion or postgenitally fused; seeds small, compressed, almost always with coma (tuft of hairs) at one end 2 1.
Corolla rotate to tube rarely longer than lobes; lobes usually spreading, with valvate to dextrorsely imbricate aestivation; corolline corona usually present in sinuses of petals as pair of lobules or single filiform to clavate lobule (usually faintly bifid), often much reduced to rounded bumps or absent (Baroniella, Baseonema, Pentanura).
Corolla rotate to campanulate or urceolate; lobes mostly with dextrorsely contorted or valvate aestivation (but sinistrorsely contorted in Genianthus); corolline corona consisting of 5 fleshy ridges radiating out along inner surface of corolla lobes close to and nearly parallel to margins and meeting in sinuses where they sometimes form pouch.
Corolla rotate to tubular; lobes valvate to imbricate; corolline corona rare in sinuses of lobes (except in some Ceropegieae and Gonolobinae, where present as annulus).
Corolla rotate to urceolate; lobes with valvate to dextrorsely imbricate aestivation; corolline corona rare (e.
Ceropegia, Echidnopsis, Stapeliopsis), often fleshy, frequently with fleshy annulus around mouth of tube, often ornamented with papillae, hairs, or cilia; lobes with valvate aestivation, sometimes remaining fused at apices; corolline corona rarely present in sinuses of corolla lobes (Leptadenia).
Corolla rotate to occasionally tubular; lobes with valvate to imbricate aestivation; corolline corona rare, in sinuses of lobes (Araujia sericifera) or annular in Gonolobinae.