TRIANDRIA.— DIGYNIA. 33 



subulate. Inferior valve of the Cor. entire, mucro* 

 nate, of with a short bristle at the tip. 



* * Terminal florets abortive, or mere rudiments. 



91. MELICA. Cal. 2 — 4-flowered,loose,membranaceous, 



Florets as long as the glumes ; one or more of the 

 superior ones abortive and incomplete. Cor. un- 

 armed, coriaceo-membranaceous. Nect. connate, 

 Seed free. 



92. ATHEROPOGON. Spikes in an unilateral raceme. 



Cal. 2-valved, membranaceous, 2-flowered ; inferior 

 glume setiform. Perfect floret 2-valved ; inferior 

 valve 3-toothed, or 3-bristled ; superior valve bifid. 

 Abortive floret pedicellate, 2-valved, 3-bristled. 



B. Flowers polygamous. 

 | Panicled. 



93. PANICUM. Cal. 2-valved, 2-flowered ; the infe- 



rior glume often very small. Florets dissimilar; 

 the lower one abortive or antheriferous, 1 — 2-valved ; 

 the inferior valve resembling in texture the glumes ; 

 superior membranaceous. Perfect floret with car- 

 tilaginous valves, unarmed. 



34. HIEROCHLOA. Cal. 2-valved, 3-flowered ; glumes 

 scarious. Lateral florets antheriferous, triandrous. 

 Central floret perfect, diandrous, (rarely triandrous.) 



15. HOLCUS. Cal. 2-flowered ; glumes membrana- 

 ceous, somewhat boat-shaped, mucronate. Florets 

 polygamous ; the inferior perfect, sessile, unarmed ; 

 superior antheriferous or neuter, pedicellate, awned 

 on the back near the middle. 



1 1 Spiked. 

 * With an involucrum. 

 96. SETAR1A. Spikelets with an involucrum of 2 or 

 more bristles at the base Cal. 2-flowered ; glumes 

 unequal, herbaceous. Inferior floret abortive, 1 — 2- 

 valved, herbaceous. Superior floret perfect, with 

 cartilaginous glumes. 



* * Without an involucrum. 

 DIGITARIA. Spikes linear, unilateral, generally 



