14. Andropogon. Spikelets spicate, in pairs, the pedicellate sterile or rudimentary; rhachis bearded.
15. Chrysopogon. Spikelets in open panicles, in pairs or threes, only the sessile fertile.
Series B. Rhachis of the spikelet usually jointed above the persistent lower glumes (jointed below the glumes only in n. 19, 31, and 36). Spikelets 1–many-flowered, the uppermost flowers often imperfect or rudimentary.
Tribe V. PHALARIDEÆ. Glumes 5, only the uppermost fertile, the 2 middle ones rudimentary or empty or staminate; palet 1-nerved. Panicle mostly contracted and spike-like.
16. Phalaris. Middle glumes mere rudiments each side of the shining triandrous flower.
17. Anthoxanthum. Middle glumes empty, awned on the back. Stamens 2.
18. Hierochloe. Middle glumes triandrous. Fertile flower diandrous.
Tribe VI. AGROSTIDEÆ. Glumes 3; flower solitary, perfect (rarely a rudimentary or perfect second flower in n. 23 and 32–34), palet 2-nerved.
[*] Flowering glume with a terminal awn (none in n. 22), closely embracing the grain in fruit; spikelets in panicles or loose spikes, the rhachis not produced beyond the flower (except in n. 24 and a single species of n. 23).—Stipeæ.
[+] Fruiting glume firm and indurated, with a callus at base (none in n. 22).