PANICE^. 89 



axis thin, wavy involute, 0.5-0.7 mm. wide. Spikelets 1.4 mm, 

 long on pedicels 1 mm. long, in two rows (one of each pair abor- 

 tive), oboviite, subacute, puberulous on the margins of the convex 

 side, first and second glumes thin, 3-nerved. 

 Mexico, Pringle 2359. 



11. P. inops Vasey, ined. 



Culms low, spreading, 10-20 cm. high. Sheaths hairy, the 

 upper one reaching nearly to the lowest spike, blades flat, jiubescent 

 on both sides, acute, 1-4 cm. long, 4-6 mm. wdde. Spikes 2-3, 

 1-2 cm. long. Spikelets mostly in pairs, smooth, nearly hemi- 

 spherical, 2.5 mm. long, first and second glumes 5-nerved, third 

 and the palea brown. 



Mexico (Jalisco), Palmer 617. 



Var. major Vasey, ined. Leaf-blades sparingly pubescent, 

 often 15 cm. long, 1 cm. wide; spikes 3-4 cm. long. 



Mexico, Pringle 1875. 



12. P. conjugatum Berg. Act. Helv. 7, /. 8: 129 (1772). 

 Culms branching, 4-7 cm. high from a creeping rhizome. 



Leaf- blades flat, acuminate, nearly smooth, 4-10 cm. long, 5-8 mm. 

 wide. Spikes 2, slender, exserted, culms digitate, sometimes with 

 1-2 lateral ones, 4-15 cm. long, 1.7 mm. wide. Spikelets secund, 

 in two rows, slightly imbricated, ovate, broadly acute, 1.7 mm. 

 long, first and second glumes thin, 2-nerved, the first ciliate on the 

 margins. 



Mexico, Palmer Ml, Pringle 3129; Alabama, 3fohr. 



Florida to Texas and Mexico. 



13. P. tenellum Willd. Enum. Hort. Berol. 1:89 (1809). 

 P. elegans Fliigge, Monog. 183 (1810). 



Culms rather slender, 60-90 cm. high. Sheaths compressed, 

 the lower ciliate at the throat; ligule 1-2 mm. long, blades of 

 sterile shoots conduplicate, 4-10 cm. long, 5-8 mm. wide, acute, 

 puberulent above, those of the culm 1-2 cm. long. Panicle 15-30 

 cm. long. Spikes 6-13. the lower 5-15 cm. long, those above 

 gradually growing shorter, rachis slightly flexuose, 0.7 mm. wide, 

 pubescent at the base and very sparingly along the sides. Spikelets 

 loosely arranged in about four rows, some of them on pedicels 



