Key: Step 100.

Spikelets with 2 male or barren florets below the fertile ; 2 basal lemmas reduced (spikelets 3-flowered), the upper lemma hard and shining .

Step 101.

Spikelets dimorphic, each fertile spikelet surrounded by several sterile spikelets (Sudan).

Lamarckia aurea (Linn.) Moench