GENUS 58. 



GRASS FAMILY. 



i. Campulosus aromaticus (Walt.) Scribn. 

 Toothache-grass. Fig. 543. 



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

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

 Campulosus aromaticus Scribn. Mem. Torr. Club 5 

 45. 1894. 



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

 what scabrous. Sheaths shorter than the inter- 

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

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

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

 extended into a point ; spikelets about 3" long ; 

 second scale thick and rigid, awn-pointed, bearing 

 just 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 to the 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 i'~3' 

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

 spikes slender, usually spreading, 2'-^' long, in one 

 or two whorls, or the upper ones approximate; 

 spikelets, exclusive of the awns, about i\" long, the 

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

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

 cially on the lateral ones, bearing just below the apex 

 a scabrous awn about 2\" 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. i. G. ambiguus. 

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



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