480 Key to the System of 



2029. Spikelets quite small. 



Leaves narrow, rather flat, gradually pointed ; panicle 

 scantily beset with short hairlets, its ultimate branchlets 

 capillary ; pistillate spikelets sessile, between two stalked 

 agynous spikelets ; outer bract pointed, often of dark- 

 bluish hue ; last bract with a short fine awn. 



A. montanus. 



Spikelets comparatively large ... ... 2030 



2030. Panicle almost glabrous. 



Tall ; leaves long, narrow ; panicle elongated, its branches 

 much whorled ; pistillate spikelets sessile between two 

 stalked agynous spikelets, slender, with a tuft of hairlets 

 at their base ; outer bract rigid, rather long, pointed, 

 with a short but very rough ciliolation ; last bract pro- 

 vided with a long twisted awn. A. Gryllus. 



Panicle much beset with hairlets. 



Tall; leaves narrow; nodes bearing a dense indument; 

 panicle elongated, its vestiture soft, brownish and shining, 

 its branches much whorled ; spikelets somewhat spicately 

 arranged, the pistillate with a tuft of hairlets at their base ; 

 outer bract indurating, elongated, soon smooth, often 

 darkened at maturation ; last bract provided with a very 

 conspicuous twisted awn. A. australis. 



ANTKISTIRIA. 



2031. Fruit-bearing spikelet largely glabrous outside. 



Tall ; leaves long, rather narrow, gradually pointed ; 

 fascicles of spikelets sessile, within clasping very short 

 floral leaves, somewhat paniculated ; non-pistillate spike- 

 lets without any stalklets, four basal, one or two higher, 

 sometimes long-ciliolated, usually producing only one 

 inner bract ; outer bract of the fruiting spikelet soon 

 hardening; awn long, somewhat twisted. "Kangaroo- 

 grass." A. ciliata. 



Fruit -bearing spikelet completely silklike -invested 

 outside. 



Tall ; leaves long, rather narrow, gradually pointed ; 

 fascicles of spikelets stalked, within clasping very short 

 floral-leaves, somewhat paniculated ; non-pistillate spike- 

 lets without any stalklets, glabrous, four basal, one or two 

 higher, usually producing two inner bracts and all stami- 

 nate ; outer bract of the fruiting spikelet soon hardening; 

 awn long, somewhat twisted. A. avenacea. 



