Lianas or scandent shrubs; branchlets cylindrical, striated, with lenticels, tomentose to glabrescent, without interpetiolar gland fields.
Lianas; branchlets cylindrical, striated, with lenticels, glabrous, without interpetiolar gland fields.
Lianas or scandent shrubs; branchlets cylindrical, without streaking, with lenticels, pilose, with interpetiolar gland fields.
9 m; branchlets cylindrical, without streaking, without lenticels, glabrous, without interpetiolar gland fields.
Leaves opposite, rarely verticillate (Curtia) or alternate (Swertia), simple, entire or reduced to scales (Bartonia and the achlorophyllous genera); scattered mucilage cells often present in the epidermis and mesophyll; petiole without stipules but occasionally with interpetiolar line.
Leaves opposite, rarely verticillate, rarely ternifolius; simple and usually entire, rarely toothed (Desfontainia); occasionally 3-5 nerved from above the base (Strychnos); usually with stipules (which are either cauducous or persistent, sometimes foliar, sometimes interpetiolar or these reduced to an interpetiolar line) or colleters.
Leaves usually opposite or appearing whorled (Gardenia), rarely alternate by suppression of one member of a pair at each node (Didymochlamys), or upper leaves alternate and lower leaves opposite (Theligonum); simple; usually entire, rarely lobed; interpetiolar stipules present; these may become foliar in nature, increase in number, become connate to encircle the stem or become reduced to an interpetiolar line, less often stipules petiolar (Theligonum); usually with colleters.