Genus 58. 



GRASS FAMILY. 



1. Campulosus aromaticus (Walt.) Scribn. 

 Toothache-grass. Fig. 543. 



Aegilops aromatica Walt. Fl. Car. 249. 1788. 

 Ctenium americanum Spreng. Syst. 1 : 274. 1825. 

 Campulosus. aromaticus Scribn. Mem. Torn Club 5 : 

 45- 1894. 



Culms 3°-4° tall, erect, simple, smooth or some- 

 what scabrous. Sheaths shorter than the inter- 

 nodes, rough; ligule 1" long, truncate; blades i'-6' 

 long, i"-2" wide, flat or involute, smooth; spike 

 terminal, solitary, curved, 2-4' long, the rachis 

 extended into a point; spikelets about 3" long; 

 second scale thick and rigid, awn-pointed, bearing 

 j ust above the middle a stout horizontal or recurved 

 awn ; third, fourth and fifth scales membranous, 

 scabrous, awned from below the 2-toothed apex, the 

 fifth subtending a perfect flower, the others empty. 



In wet soil, especially in pine barrens, Virginia to 

 Florida and Mississippi. Lemon-grass, Wild Ginger. 

 July-Sept. 



59. CHLORIS Sw. Prodr. 25. 1788. 



Mostly perennial grasses with flat leaf-blades and spicate inflorescence, the spikes solitary, 

 few, or numerous and verticillate or approximate. Spikelets i-flowered, arranged in two 

 rows on one side of the rachis. Scales 4; the 2 lower empty, unequal, keeled, acute; third 

 and fourth usually awned, the former subtending a perfect flower; palet folded and 2-keeled. 

 Stamens 3. Styles distinct. Stigmas plumose. Grain free, enclosed in the scale. [Greek, 

 greenish-yellow, referring teethe color of the herbage.] 



About forty species, mostly natives of warm and tropical regions. Besides the following some 

 10 others occur in the southern United States. Type species: Agrostis cruciata L. 



i. Chloris verticillata Nutt. Windmill-grass. 

 Prairie Chloris. Branching Foxtail. Fig. 544. 



Chloris verticillata Nutt. Trans. Am. Phil. Soc. (II.) 



5: 150. 1833-37. 



Culms 6'-i8' tall, erect, or decumbent and rooting 

 at the lower nodes, smooth, glabrous. Sheaths 

 shorter than the internodes, smooth, or roughish at 

 the summit; ligule a ring of short hairs; blades 1/-3' 

 long, l"-2" wide, obtuse, often apiculate, scabrous; 

 spikes slender, usually spreading, 2'-4i' long, in one 

 or two whorls, or the upper ones approximate ; 

 spikelets, exclusive of the awns, about ij" long, the 

 first scale about one-half the length of the second; 

 the third 1" long, obtuse, ciliate on the nerves, espe- 

 cially on the lateral ones, bearing just below the apex 

 a scabrous awn about 2 J" long; fourth scale as long 

 as or shorter than the third, awned near the usually 

 truncate apex. 



On prairies, Missouri to Colorado and Texas. May- 

 July. 



Chloris elegans H.B.K., common from New Mexico to 

 California and southward, has been reported from Kan- 

 sas. Distinguished from the above by its short stout 

 spikes and the tuft of long hairs at the summit of the 

 . lateral nerves of the flowering scales. 



60. GYMNOPOGON Beauv. Agrost. 41. pi. 9. f. 3. 1812. 



Perennial grasses with flat and usually short rigid leaf-blades and numerous slender alter- 

 nate spikes. Spikelets i-flowered, almost sessile, the rachilla extended and bearing a small 

 scale which is usually awned. Scales 3 or 4; the 2 lower empty, unequal, narrow, acute; 

 third broader, fertile, 3-nerved, slightly 2-toothed at the apex, bearing an erect awn; the 

 fourth empty, small, awned; palet 2-keeled. Stamens .3. Styles distinct. Stigmas plumose. 

 Grain linear, free, enclosed in the rigid scale. [Greek, naked-beard, referring to the pro- 

 longation of the rachilla.] 



Six species, all but one American. Type species : Andropogon ambiguus Michx. 

 Spikes bearing spikelets their whole length ; awn longer than flowering scale. 1. G. ambiguus. 

 Spikes bearing spikelets above the middle ; awn shorter than flowering scale. 2. G. brevifolius. 



15 



