Pennisetum

(Inflorescences bottlebrush-shaped. Fertile lemma soft, as opposed to hard lemma in Setaria)

1. Bristles fused...

1. Bristles separate...2

2. Plants often 8'-12' tall...Elephant Grass (very common, forming monospecific stands)

2. Plants < 6' tall...3

3. Lower glume 1.2-2.4 mm long; the two lemmas of different textures; primary bristles < 25 mm....

3. Lower glume 0 - 0.3 mm long; the two lemmas of similar texture; primary bristles 2.5-4 cm long... (escaped ornamental species)