GRAMINEAE 27 



2. C. inexpansa A. Gray. l-3 high, stout : panicle long, its 

 branches short and erect : spikelets straw-colored, l // -2 // long, the basal 

 hairs about the length of the third glume : awn slightly bent, about the 

 length of the glume. Of rare occurrence in low woods along the Missouri 

 River near Courtney. June-July. 



25. CALAMOVILFA Hack. 



The rachilla not produced, the outer glumes unequal, and the third 

 glume not awued. Otherwise much as in Calamagrostis. 



1. C. longifolia (Hook.) Hack. REED-GRASS. Glabrous perennial 

 with long creeping rootstocks, 4-6 high : panicle 10 / long, narrow, 

 interrupted at base, its branches erect : spikelets 2 // -3 // long. In one 

 locality in the sandy Missouri River bottom near Atherton ; also near 

 Harlem, Clay County, Missouri. August. 



26. APERA Adaus. 



An annual with one-flowered spikelets in an open panicle. Rachilla 

 produced beyond the flower in the form of a bristle. Flowers much as in 

 Agrostis, but the third glume two-toothed and bearing a long slender awn. 

 Palet a little shorter, two-toothed. 



1. A. Spica-venti (L. ) Beauv. BENT-GRASS. l-2 tall, with a pan- 

 icle4 / -8 / Jong, its branches capillary : spikelets \ f/ -\\ f/ long, the delicate 

 awn 3 x/ -4 /x long. Very sparingly adventized along the railroad from 

 Courtney to Sheffield. June-July. 



27. HOLCUS L. 



Spikelets 2-flowered in close panicles. Glumes four, the two lower 

 empty, the first and second three-nerved, the third awnless, enclosing a 

 perfect flower, the fourth bearing a short bent awn and enclosing a starn- 

 inate flower. 



1. H. lanatus L. VKLVET-GRASS. A softly pubescent annual, 1^-2J 

 high : panicle dense, 2 / -3 / long : spikelets 2 /x long. Rarely occurs as a 

 waif along railroads at Sheffield. July. 



28. TRISETUM Pers. 



Perennials with 2-4-flowered spikelets in open panicles. Two lower 

 glumes empty, the flowering two-toothed and bearing a short bent or 

 flexuous awn below the apex. Palet two-toothed. Rachilla extending 

 beyond the flowers. 



1. T. flavescens (L.) R. & S. FALSE OATS. U-2 high, smooth : 

 panicles 2 / -5 / long, yellowish, open, the branches naked below : spikelets 

 3-4 flowered. Sparingly adventized along railroads from Courtney to 

 Sheffield. July-August. 



29. AVENA L. 



Lower flowers perfect, upper imperfect. Two lower scales large, empty, 

 membranous and persistent. Flowering glumes firmer in texture, two- 

 toothed. Palet narrow. 



