PANICE.E. 141 



partially included by the leaves, narrow, erect, compact, 4-7 cm. 

 long, 5-7 mm. wide; rays rather stiff, appressed, 1-3 cm. long. 

 Spikelets smooth, oval or ovoid, 2.5 mm. long; first glume thin, 

 deltoid, 1-uerved, about 1 mm. long; second and third glumes 

 equal, delicately 9-11-uerved; fertile floret smooth, subacute, 

 2.3 mm. long. 



Mexico, Pringle 1415. 



Wet places, pine plains, base of Sierra Madre, Sep. 30, 1887. 

 The above description was made entirely fi'om the single specimen 

 above noticed. 



66. P. commutatum Schultes, Mant. 2:242 (1834). P. nervo- 

 sum Muhl. Gram. 116 (1817), not Lam. 



A rather slender, erect perennial. Culms simple, smooth, 

 40-60 cm. high; nodes dark purple. Sheaths smooth or softly 

 ciliate, some of the lowest shorter and thicker and rough, covering 

 about half the internodes; blades ovate-lanceolate, or lanceolate with 

 the base cordate, smootli, except the ciliate margins, 11-nerved, 

 7-10 cm. long, 1-2 cm. wide. Panicle exserted, pyramidal or oval, 

 spreading; branches slender, flexuous, smooth, 6-13 cm. long. 

 Spikelets numerous; capillary pedicels 3-15 mm. long, ellij^tical, 

 subacute, minutely hairy under a lens, or smooth, 3.5-3 mm. long; 

 first glume broad, thin, 1-nerved; second glume and floral glume of 

 the neuter floret equal, 7-nerved. the palea to the latter half as long 

 as the spikelet; fertile floret smooth, oval, obtuse, 3.3 mm. long. 



U. S. Dept. Agricul. no locality, Georgia, Cooley; Kentucky, 

 herb. Michigan Univ. from Houghton; Texas, Nealley. 



By some this is included with P. dichotomnm L. 



Michigan, Pennsylvania, to Louisiana. 



Var. consanguineum (Kunth). P. consanguine^im Kunth, Rev. 

 Gram. 1:36 (1839). P. villosum Ell. Bot. S. C. & Ga. 1:124 

 (1816). P. angustifoliwn Ell. Bot. S. C. & Ga. 1:129(1816). 

 Culms branching. Sheaths pubescent; blades villous on the 

 margins near the base, 5-8 mm. wide. Panicle sometimes partially 

 included. 



Virginia, U. S. Dept. Agricul. from Vasey ; Florida, Ciirtiss 

 3583. 



