AdHOSTIDE.E. 



287 



Fig. 52. — Sporoholus interruptus. 

 A, spikelet; b, tioret. (Scribuer.) 



glume oval, acute, 1-nerved, 5 mm. long; palea but little shorter, 

 emarginate, infolded on the back between the nerves. 



Arizona, Jones, Cones £ Pal- 

 mer 50, 66. 



3. S. asper (Michx.). Kunth, 

 Rev. Gram 1:68 (IS'^U). Agrostis 

 aspera Michx. Fl. Bor. Am. L. 

 53 (1803). Vilfa aspera Beauv. 

 Agrost. 16 (1812). Agrostis 

 clandestina Muhl. Gram. 73 

 (1817). A. longifolia Torr. Flor. 

 TJ. S. 1:90 (1824). MvJihnhergia 

 clandestina Trin. Unifl. 190 

 (1824). S. involnta Muhl. Gram. 

 72 (1817). 



A very variable tufted perennial, 60-100 cm. high ; culms solid 

 as those of Maize. Leaves of sterile shoots as long as the culm, 

 or more than half as long, blades involute, tapering to a long thread- 

 like point, those of the culm 5-7 in number, narrow with slender 

 points, all blades rough on the edges, sheaths often distended with 

 lateral jjanicles ; ligule very short, throat ciliate. Panicles terminal 

 and lateral, parti}' or almost wholly enclosed in tlie sheaths, spike- 

 like, 5-15-30 cm. long, the rays erect, 3-8 cm. long. Empty glumes 

 ovate-lanceolate, keeled, 1-nerved, first 2-3 mm., second 3-4-5 mm. 

 long; floral glume pubescent or smooth, like the second glume, only 

 1-2 mm. longer; palea pubescent or smooth, acute, extending 

 beyond its glume, or else obtuse, and equalled by or even shorter 

 than its glume. Grain broadly elliptical, 1.5 mm. long. 



Massachusetts, Cooley; Alabama, McCarthy; Texas, Xealley; 

 Arkansas, Harvey 22. 



Found from Xew England to Texas. 



Var. Drummondii Vasey, Contrib. U. S. Nat. Herb. 3 : 60 

 (1892). Vilfa Drummondii Trin. 



Culms very slender; panicles mostly terminal, only exserted or 

 partially included; no lateral panicles, or very small ones. 



Texas, Reverchon 1047. 



