134 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



Lawns and old pastures usually become Bermudagrass sod. Indeed, 

 a large proportion of the lawns are planted with this grass, although 

 its abundant production of pollen makes it the commonest cause of 

 hay fever in that region. The bulk of the world supply of Bermuda- 

 grass seed is produced near Yuma, Ariz. 



1. Cynodon dactylon (L.) Pers., Syn. PL 1: 85. 1805. 



Panicum dactylon L., Sp. PI. 58. 1753. 



Capriola dactylon Kuntze, Kev. Gen. PL 2: 764. 1891. 



Throughout the State, at low altitudes, lawns and waste places. 

 New Hampshire to Michigan, south to Florida, Arizona, and southern 

 California; introduced in America. 



52. SCHEDONNARDUS. Tumblegrass 



Slender, freely branching perennial, with few to several stiffly 

 spreading spikes, distant on a slender, triangular axis; spikelets ses- 

 sile, appressed, in 1 row on each of 2 sides of a triangular rachis ; glumes 

 abruptly narrowed into stiff awn-points, the second longer than the 

 first; lemma 3-nerved, acuminate, a little longer than the glumes, 

 awnless. 



1. Schedonnardus paniculatus (Nutt.) Trel. in Branner and Coville, 

 Geol. Survey Ark. Rpt. 1888 4 : 236. 1891. 



Lepturus paniculatus Nutt., Gen. PL 1: 81. 1818. 



Apache, Navajo, Coconino, and Yavapai Counties, up to 7,100 feet, 

 on plains. Illinois to Saskatchewan and Montana, south to Texas 

 and Arizona; Argentina. 



53. SPARTINA. Cordgrass 



Rather coarse perennial with strong, scaly rhizomes, and several 

 ascending or spreading spikes, these racemose on a common axis, the 

 rachis produced beyond the spikelets; spikelets 1-flowered, disarticu- 

 lating below the glumes; first glume shorter, the second longer than 

 the floret; lemma firm but thinner than the glumes, keeled, subobtuse; 

 palea as long as, or longer than the lemma, with thin, very wide 

 margins. 



1. Spartina gracilis Trim, Acad. St. Petersb. Mem. VI, Sci. Nat. 

 4 1 : 110. 1840. 

 Apache and Navajo Counties, at medium altitudes, plains and in 

 saline soil, August. Saskatchewan to British Columbia, south to 

 Kansas, Arizona, and California. 



54. CHLORIS 



Annuals or perennials, sometimes stoloniferous, with several digi- 

 tate spikes; spikelets with 1 perfect floret, the rachilla prolonged be- 

 yond the floret, bearing a club-shaped rudiment composed of 1 or 

 more reduced sterile lemmas; fertile lemma 3-nerved, awned from the 

 back just below the apex. 



C. virgata, sometimes known as feather fingergrass, is a common 

 annual weed, especially in alfalfa fields. It furnishes appreciable 

 quantities of forage on the cattle ranges in the southeastern counties, 



