Panicum L.
Spikelets all similar, globular or ellipsoid. Inflorescence usually broad and/or the spikelets distant. Leaves usually not xeromorphic Panicum
Either; plants decumbent with panicles under 10 cm long; or plants erect or decumbent and less than 40 cm high with inflorescences with 2–3 branches and few spikelets
Plants erect or slightly decumbent, up to 40 cm high. Leaf blades 5–8 cm long, c. 3 mm wide. Panicle with 2–3 spreading branches each with a few spikelets arranged close together. Spikelets 2–3 mm long. In or near water. Fl. summer. White Water Panic Panicum obseptum
Plants decumbent, rooting at the nodes. Leaf blades 3–5 cm long, 4–6 mm wide. Spikelets c. 1.5 mm long, distant on the rhachis. Panicle 4–10 cm long, usually with several branches. In or near RF or humid places. Fl. winter–summer. Dwarf Panic Panicum pygmaeum