GENERA AND SPECIES. 
Spikes at first erect, at length spreading or reflexed ; 
spikelets alternate along the rhachis. 
Rhachis slender or slightly dilated, slightly hairy 
Rhachis flat, ending in an awn-like point; a rigid 
bristle under the lowest spikelet ... ih 4 
Spinifex. 
Glabrous, erect; branches clustered surrounded by 
short leaves 
Silky-pubescent leaves; peanahes Lee baet: eel 
creeping in sand by the sea. Heads of spikelets 
several inches diameter Bi: as is 
Neurachne. 
Spike ovoid, about 1 in.; outer glume 5- or 7-nerved, 
with long spreading hairs on the back. Erect 
glabrous .. at ae ie is 
Spike narrow, 1 to 2 in. fea Stems from a woolly 
base. 
Outer glume with a transverse callosity bearing 
long cilia 
Outer glume thin, + glabrous « or pdieellored oe a fa 
enia. 2. Dag elas pak 
Hemarthria. 
Slightly branched, ascending to 1 foot; spikelets 
closely appressed 3 af 
Imperata. 
Tall, stiff, erect, glabrous; leaves erect often longer 
‘than the stem 3 
Erianthus. 
Stems slender, sometimes tall; silky hairs of spike 
rich-brown — 5” ma oe 
Andropogon. 
Spikes 2 or more clustered at the end of the peduncle. 
Spikelets concealed under copious silky hairs. 
Outer glumes, rhachis and _ stalklets nay. 
Nodes bearded ... 
Rhachis and stalklets only or Viet Raids : 
outer glumes marked with a pit on the back 
Spikelets silky hairy, but not concealed. 
Spikes 3 or 4, quite terminal, in a close cluster 
Spikes many, the common axis elongated 
191 
distachyum 
reversum 
paradoxus 
hirsutus 
alopecuroides 
Mitchelliana 
Munroi 
compressa 
arundinacea 
fuluvus 
sericeus 
pertusus 
annulatus 
punctatus 
