FESTUCE.E. 535 



drooping, the longest 4-7 cm. long, bearing a few spikelets on the 

 onter third or quarter, Spikelets 5-6 mm. long, 3-5-flowered, 

 linear or oval, pale green, often tinged with purjile, joint of 

 rachilla about 1 mm. long; empty glumes acute, first lanceolate, 

 1-nerved, 3.2 mm. long, second oval-lanceolate, 3-uerved, 3.7-4.2 

 nmi. long; floral glume 4 mm. long, thin, oval, erosc-obtuse, the 

 upper third scarious, pubescent on the marginal nerves and on the 

 lower three-fifths of the keel; palea linear, about 3 mm. long, 

 scabrid on the keels. 



Delaware, Canby; Pennsylvania (Phila.) Scribiier 1; Tennes- 

 see (Knoxville), Scribner. 



Rocky or hilly woodlands, Pennsylvania to Virginia and spar- 

 ingly westward. 



9. P. arachnifera Torr. Marcy, Exp. Red Riv. of La. 301 

 (1853). P. (/eusi flora Buckl. Proc. Acad. Pliila. 90 (18G3). 

 Texas Blue Grass. 



A light green grass, 30-90 cm. higli, with an abundance of 

 creeping rootstocks. Leaves of sterile shoots numerous and loug^ 

 those of the culm 3 in number, ligule 1 mm. long; blades flat 

 or involute, scabrous or smooth, 10-20 cm. long, 4-6 mm. wide, 

 pungent-pointed. Panicle contracted, linear or oblong, 8-16 cm. 

 long, rays in threes to fives, erect, the longest 4-6 cm. long, bearing 

 bunches of spikelets from near the base to the apex. Spikelets 

 oval, 5-6 mm. long, 4-5-flowered, joint of rachilla 0.6 mm. long, 

 empty glumes acute, scabrid on the keels, first lanceolate, 1-nerved,, 

 2-5 mm. long, second oval-lanceolate, 3-nerved, 3-3.3 mm. lono-; 

 floral glume 3.5-4 mm. long, thin, copiously webbed at base, more 

 or less pubescent on the lateral nerves and the lower half of the keel, 

 oval, acute, or almost mucronate, the lateral nerves obscure and ex- 

 tending two- thirds of the way to the apex ; palea linear, 3. 2 ram. long. 



Mississippi, Tracy; Kansas, Keller man n ; Texas, Reverchon for 

 U. S. Dept. Agricul. 633, Nealhy. 



Texas to Xew Mexico. See Vol. I. 143, Fig. 69. 



Var glabrata Vasey, Cat. Grass. U. S. 79 (1885). Floral 

 glumes shorter, glabrous, and destitute of webbed hairs. Found 

 with the species. 



