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Key to Spermacoce
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40340
1 Calyx with 4 lobes of nearly equal length. | |
5 Corolla not villous in throat; sepals erect in fruit, narrowly triangular, > 5× as long as width at base; [s. TX] | |
6 Stems not winged; trichomes on plant white. | |
8 Plants with many stems branching from the base; terminal inflorescence with 15-30 flowers, heads also at most in the next axil below; corolla tubes 1.5-2.5 mm long, the lobes ca. 2 mm long; fruit (including persistent calyx lobes) 2.5-4.0 mm long; [endemic to pine rocklands in s. FL] | |
8 Plants single-stemmed or sometimes many-branched at the base; terminal inflorescence with 30-100+ flowers, heads at 3 or more nodes below; corolla tubes 0.5-1 mm long, the lobes < 1.5 mm long; fruit (including persistent calyx lobes) 2.0-2.5 mm long; [disturbed habitats, nativity uncertain] |