GENERA AND SPECIES. 
ORDER GRAMINEAE. 
1. One fertile flower with or without barren 
ones in each spikelet. 
A. Pedicel of the spikelet jointed below the 
glumes. Outer glumes 3 
Involucral bristles supporting each spikelet. 
- Bristles whorled; spikelets in cylindrical panicles 
Bristles unilateral; spikelets in a simple panicle ... 
Outermost glune often minute; spikelets arranged in a 
spreading panicle, or spike-like ; one barren flower 
in the spikelet ... : 
Spikelets wrisexual, arranged in dene ene 
Spikelets in a dense spike, 1 or 2 outer glumes ciliate ... 
Spikelets arranged in pairs; one spikelet in each pair 
fertile and sessile, the other usually sterile. 
Spikelets in alternate pairs in the notches of the 
rhachis of a simple spike 
Spikelets in a dense cylindrical panicle; glumes 
concealed under long silky hairs ; stamens | or 2 
Both spikelets fertile invested in long soft hairs ; 
spikelets in cylindrical panicles ; stamens 3 or 2; 
two of the glwmes awned 
Fertile spikelets supported by 1, 2, or bs pee elegy 
lets ; one or more glumes awned. 
One or two sterile spikelets supporting the fertile 
one; inflorescence panicled or spicate 
Four sterile spikelets supporting the fertile one, 
within sheathing leafy bracts 
BL. Pedicel of the spikelet jointed ae the 
glumes. Outer glumes 2. 
Spikelet with a callous ring at the base; flowering glume 
shortly awned; spikelets 1-flowered nee 
Spikelets 1-flowered, in a loose narrow spike or raceme; 
the outer glumes with long straight awns oes 
Spikelets 1-flowered, not awned ; the larger outer glume 
with short hooked bristles ; inflorescence spike-like 
C. Pedicel of the spikelet jointed above the 
glumes ; outer glumes 3. 
Spikelets 1-flowered, 2 additional bracts below the arti- 
culation, two of the glumes awned; stamens 4; 
spikelets i in panicles ; as 
Spikelets 2- or 3-flowered ; sient ing ee aaah 9 
plumose awns ; inflorescence a spike-like panicle... 
Spikelets 1-flowered in the alternate notches of the 
rhachis of a simple spike. (Resembles Hemarthria) 
187 
Setaria 
Pennisetum 
Panicum 
Spinifex 
Neurachne 
Hemarthria 
Imperata 
Erianthus 
Andropogon 
Anthistiria 
Eriochloa 
Perotis 
Tragus 
Ehrharta 
Pappophorum 
Lepturus 
