TUISTECilNPLE. 



77 



many-tlowered, yellowish, 15-o0 cm. long, 3-5 cm. broad, rays 

 bearing spikek'ts along the upper half. S])ik('lets on })edicols 1-2 

 or more mm. long. First glume ovate-lanceolate, extending to the 

 top of the florets, 3-nerved, 3-3.5 mm. long including the stout 

 point, raehilla broad and carrying the second glume 0.3 mm. above 

 tlie first glume, second glnme linear-lanceolate, 5-nerved, 4-5 mm. 

 long, including the stout point, third glume (floral glume of tlie 

 staniiiiato floret) ovate-lanceolate, 2.5 mm. long, delicately 5-nerved, 

 lateral nerves near each other, its palea 2 mm. long, fourth glume 

 (floral glume of the upper floret) meml)ranous, delicately 3-uerved, 

 1.7 mm. long, bearing a tuft of very short hairs at its base, and a 

 terminal awn 6-10 mm. long, the lower third of which is brown 

 and twisted. 



Fig. 20, — Arundinella Palmeri. A, a, Deppraiia; Ji, l<, spikdets and Horets 



respectively. (Scrilmer.) 



Nearly allieil to .1. pallida Xeos, of wliich it is pof^sibly only a 

 variety. Mexico, /'aimer 12. 



2. A. pallida Xees. Agrost. liras. ir.5 (IS29). 



A rather smooth, stout, erect pen-nnial. Culms hard. 18(1-200 

 cm. Iiigh. Ligule very short ; blades smooth below, scabrcd or 

 |iubescent above. 25-40 cm. long. •'» 10 mm. wide. Panicle ovoid 

 or narrowo., 30-4(» cm. long, rays smooth in thi-ccs to lives, spar- 

 ingly branched. Spjkelets on pi'dicels 1-2 mm. long, scattered the 



