TRIANDRIA. DIGTNIA, 45 



these may all be considered as distinct, the United 

 States produce half as many species of this genus 

 as all the rest of the world besides, there being only 

 40 enumerated by Persoon. In India there are 6 species, 

 of which 2 produce spikes like Pa5paZ7/m or Big-itaria^ 3iw6. 

 another species with the same anomalous habit in the isle 

 of St. Helena; there is 1 specits in Japan; 1 in Senegal; 

 1 in Teneriffe; X at the Cape of Good Hope; 3 in Arabia; 

 1 in New Zealand; 4 in the West India islands; and all the 

 rest in Europe; of which, several of the southern species 

 are equally common to Barbary. Not one species from 

 South America, Northern Asia, or New Holland. 



This genus affords to the agriculturist some of the 

 most important objects of cultivation both for pasturage 

 and artificial meadows, among these the A. stolonifera 

 with its numerous varieties is considered as the most 

 useful. 



69. CINNA. L. 



Calix 2'Valved, compressed, nearly equal. 

 Corvlla linear, compressed, shortly stipitate, 

 naked at the base; dorsal valve including the 

 inner, with a small awn near the summit. 

 Stamen 1; style I. Seed suniewiiat oblique. 



Panicle large, reed-like, branches crowded, waving; 

 flowers compr(;ssed, approximating so as almost to ap- 

 pear imbricated, smooth, with conspicuous scariose mar- 

 gins, leaves broad. 



The Cin?ia differs greatly in habit from Jlgi^ostis as well 

 as character; its habit is that of Ariuido, and the base of 

 the corolla, which is shortly stipitate, is destitute of the 

 minute pubescent tufts which characterize the Agrostis., 

 The awn of the corolla is also extremely small. 



70. CALAMAGROSTIS. Roth. (Species of 

 Arundo and Agrostis. L.) (Reed Bent- 

 grass.) 



Calix 2-valved, 1 flowered, valves acute or 

 acuminate. Corolla 2-valvrd, mostly shorter 



length of the corolla, which is of a leaden purple, sometime* 

 subjf-ct to monstrosity, forming a nut like a Scleria! 



Hab. In sterile naked plains and arid argillaceous soils, near 

 Fort Mandan on the Missouri. 



