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Key to Paederia
Rubiaceae
Paederia
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40342
1 Fruit broadly ellipsoid to ovoid, somewhat flattened laterally, 6-11 mm long × 4.5-8 mm wide; seeds winged; flowers generally borne in small rather congested groups; calyx lobes 0.4-2 mm long; corolla lobes 2-4 mm long; [s. FL only]; [subgenus Alatopaederia]
1 Fruit subglobose, not at all flattened, 4-7 mm long × 4-7 mm wide; seeds not winged; flowers generally borne in branched cymules; calyx lobes 0.4-1 mm; corolla lobes 1-2 mm; [more widespread in our area]; [subgenus Paederia]