Victorian Plants. 107 



523. Spikelets arranged in a very slender cylindrical spike. 



Spikelets seated alternately in excavations of the rhachis, 

 awnless ; lowest bracts rigid ; stamens three. 



Lepturas. 2020 



Spikelets arranged in a dense spikelike panicle. 



Fruit-supporting bracts ending in nine or more somewhat 

 plumous almost equal minute awns ; keel-like prominence 

 none ; stamens usually three. Pappophomm. 2021 



524. Spikelets provided with an awn on one or more of the 



flower-bearing bracts ... ... ... ... 525 



Spikelets awnless or one or more awns on the lowest 

 bracts or on the rhachis or rhacheoles ... ... 527 



525. Spikelets all pistillate. 



Spikelets arranged by pairs in spikelike panicles, one sessile, 

 the other on a stalklet, all invested with long and soft 

 hairlets ; stamens three or two. Erianthus. 2022 



Spikelets partly pistillate ... ... ... ... 526 



526. One or two non-pistillate spikelets supporting one 



fruit-bearing spikelet. 



Spikelets arranged either in a panicle or in one or more 



spikes ; stamens three. Aiidropogon. 2023 



Several non-pistillate spikelets supporting one fruit- 

 bearing spikelet. 



Spikelets fascicular-clustered, the clusters arranged in a 

 leafy panicle or solitary ; stamens three. 



Anthistiria. 2031 



527. Lowest bracts densely beset with long soft hairlets. 



Spikelets arranged by pairs in a dense spikelike panicle; 

 branchlets of the panicle unjointed ; all bracts awnless ; 

 stamens one or two. Imperata. 2032 



All bracts smooth or beset with very short hairlets... 52& 



