*Pennisetum alopecuroides (L.) Spreng.

Inner bristles not plumose, scabrous; the longest 30–40 mm long, but mostly 10–20 mm long. Panicle 8–14 cm long, 4–5 cm diam., usually purplish. Plants up to 1 m high. Widespread. Floodways; wet places. Fl. summer. Swamp Foxtail