442 POACE^. 



rudiment simple or bifid; empty glumes pilose, much shorter than 

 the spikelets; floral glume densely hairy. 



Mexico, Palmer 200. rringle 2550. labeled P. geminata. 



Fig. 83. — Pentarrhaphis Fournierana. Spike spread open. (Scribner.) 



2. P. scabra H. B. K. Nov. Gen. 1:178, t. 60 (1815). 



Culms branching, taller; leaf-blades longer and broader ; spike- 

 lets only one at each node of the rachis, first empty glume and the 

 bristlelike rudiments scabrous. Not seen by me. 



3. P. paupercula (Presl). Scribn. Bull. Torr. Club. 17:233 

 (1800). PolyscMstis paupercida Presl, Eel. Ha?nk. 1 : 294, /. 41 

 (1830). 



Blades of sterile shoots short, like those of the culms; spikelets 

 only one at each node of the rachis, the short pedicel of the second 

 floret pilose. Not seen by me. 



TRIBE XL— FESTUCE^. 



Spikelets 2- to many-flowered, very rarely 1-flowered, in a spread- 

 ing, narrow or spikelike panicle, rachilla articulate or continuous, 

 usually i)roduced above the upper floret or bearing 1 or more ter- 

 minal empty glumes. Empty glumes usually narrow, keeled, acute 

 or obtuse, shorter than the nearest floral glumes; floral glume 

 usually broader, entire, awnless or with 1- to many terminal (rarely 

 dorsal) straight awns; palea 2-keeled, usually as long as its glume or 

 nearly so. Embryo usually small. Grain free from the palea or ad- 

 nate. A very large tribe containing the most important meadow- 

 grasses of cool regions. 



A. Spikelets usually few-flowered. Floral glumes divided 



into 3 to many awns or lobes, or the awns dorsal. . . (a) 



