KEY TO THE GENERA/SPECIES

1Leaves opposite, ovate-orbicular or subreniform; stipules ochraceous, often falling off rapidly; pedicels stipitate-glandular puberulent; sepals herbaceous with scarious margin; petals deeply bifid; seeds 1-12, tuberculate in lines
1'Leaves in whorls of ca. 15 leaves per node, linear, aristate; stipules silvery, persistent; pedicels puberulent, not glandular; sepals scarious; petals entire or slightly dentate; seeds 2-6, corrugated