All specimens examined from the Eastern Cordillera at the department of Boyaca (Colombia) above 2750 m in elevation are shrubs 5 m tall (exceptionally small trees to 10 + meters), with two interpetiolar
and laciniate stipules, leaf blades with 8-11 pairs of lateral veins and entire, plane margin (Fig.
Liana; branchlets cylindrical, striated, without lenticels, pubescent, with interpetiolar gland fields.
Liana; branchlets cylindrical, striated, with lenticels, pubescent, without interpetiolar gland fields.
Species of Didymaea are characterized by their procumbent or climbing stems, opposite leaves with ovate, oblong-ovate, lanceolate, elliptic, or rarely linear blades, small, shallowly to deeply bilobed or geminate interpetiolar
stipules, axillary inflorescences with small, bisexual homostylous flowers with calyces reduced or absent, small, white to purple corollas with short tubes and 4-valvate lobes, 4 stamens with dorsifixed anthers, 2-locular ovaries with one axillary ovule per locule, and black, drupaceous fruits that are dimidiate and deeply bisulcate or sometimes subglobose.
Chamaesyce is characterized by many unusual synapomorphies: apical abortion of the main shoot and subsequent sympodial growth; interpetiolar
stipules; opposite and frequently asymmetrical leaves; and [C.
Leaves opposite, occasionally whorled, rarely alternate, simple and entire, rarely compound, lobed or toothed; with (mainly but not exclusively Rubiaceae) or without stipules, interpetiolar
stipules or these reduced to an interpetiolar
line or colleters.