354 GRASS FAMILY 



HILARIA H. B. K. 1815 BLACK BUNCH GRASS 

 (Named for St. Hilaire, a French botanist) 



PL 46, fig. 32. 



Spikelets in groups of 3 at each joint of the zig-zag axis of the spikes, 

 the outer spikelets 2-3-flowered and staminate, inner spikelet 1-flowered, 

 pistillate; glumes unequal, 5-nerved, usually 2-lo<bed, the lower glume 

 awned ; lemmas much narrower than the glumes ; perennials with terminal, 

 solitary spikes. 



Stems 1-2 ft. high; spikes 2-4 in. long; spikelets 8-10 

 mm. long; awn of the lower glume longer than the 

 spikelet H. Jdmesii 



HOMALOCENCHRUS Meigen 1776 RICE, CUT GRASS 



(Gr. homalas, like, kenchros, millet) 



Spikelets 1-flowered, in panicles, strongly flattened; glumes 2, the lower 

 broad and folded, the inner much narrower; lemma and palet lacking; 

 marsh perennial. 

 Stems 1-4 ft. high; panicle 5-9 in. long; spikelets 4-5 



mm. long H. oryzoides 



HORDEUM Linne 1753 BARLEY, SQUIRRELTAIL GRASS 

 (The Latin name of the barley) 



PL 46, fig. 25. 



Spikelets 1-flowered, usually 3 at each joint of the axis of the terminal, 

 cylindric spike, lateral spikelets usually short-stalked and imperfect, the 

 axis produced beyond the flower; glumes usually awn-like and appearing 

 like the involucre around the spikelet ; lemma rounded on the back, 5- 

 nerved, awned, palet nearly equal, 2-keeled ; annual or perennial. 



1. Spikes feathery with spreading awns; awn of the 



central lemma 1-3 in. long H. jubdtum 



2. Spikes narrow, the awns short and erect 



a. Glumes needle-like, all alike 



( 1 ) Lateral spikelets neutral H. nodosum 



(2) Lateral spikelets with flowers H. boredle 



b. Glumes of 2 sorts, those of the middle spikelet 



broad at base, lanceolate H. pusillum 



KOELERTA Persoon 1805 KOELERIA 

 (Named for Koeler, a German botanist) 



PL 45, fig. 28. 



Spikelets 2-5-flowered, in a spike-like panicle ; glumes unequal, narrow, 

 acute, keeled ; lemma 3-5-nerved, palet 2-keeled ; perennial. 



