Paspalum

1. Spikelets borne in pairs along each side of the rachis (rarely one of the pair aborted, but still represented by a pedicel), mostly 1.8–2.3 mm long; ligule a short (less than 1 mm, usually less than 0.5 mm) membranous band behind which is a dense row of much longer hairs.

P. setaceum

1. Spikelets borne singly along each side of the flattened rachis; mostly 2.6–3 mm long; ligule membranous, 1.5–3 mm long, longer hairs lacking or sparse and near the leaf magins only.  

P. laeve