Allied to Panicum scahrinsculuvi Ell. but readily distinguished by its larger 

 spikelets, less densely flowered panicles, and distinctly cartilaginous, ser- 

 rulate leaf margins. The plant throughout is more slender. 



PANICUM POLYCAULON Nash. Torr. Bui. 24; 200, April, 1897. Low 

 places, borders of swamps, Minatitlan, State of "Vera Cruz, June 30. 

 Jared G. Smith, No. 555. 1893. 



MUHLENBERGIA SETARIOIDES Fourn., Mex. PI. Enum. Gram. 84. 



Under the spray of the Cascade in 

 Barranca of Texola near Ja- 

 lapa. State of Vera Cruz, alti- 

 tude 1,100 m. (3,500 feet), 

 April 30. C. G. Pringle, No. 



8096. 1899. 



MUHLENBERGIA ALAMOS- 

 ANA Vasey. Coult., Bot. 

 Gaz. 16: 146, 1891. Mossy 

 cliffs, Sierra de Tepixtlan near 

 Cuernavaca, altitude 2,800 m. 

 (7,500 feet), February 8 and 

 March 14. C. G. Pringle, No. 

 6994. 1899. 



SPOROBOLUS PILIFERUS 



(Trin.) Kimth. Enum. Plant. 

 1 : 211, 1833. Fields near Ja- 

 lapa. State of Vera Cruz, alti- 

 tude 1,250 m. (4,000 feet). C. 

 G. Pringle, No. 7881. 1899. 



AVENA MICRANTHA sp. nov. 

 (Fig. 1.) 



A very slender, densely cespitose, 

 upright perennial, 2.5-3.5 dm. 

 high, with soft leaves 6 — 15 

 cm. long, 1-2 mm. wide, lig- 

 ules 5-6 mm. long, and loosely 

 flowered simple panicles 5-7 

 cm. long. Sheaths glabrous; 

 leaves pubescent above,' 

 smooth beneath, becoming 

 involute when dry ; branches of 



the panicle capillary, spread- Fig, l .-Avena micrantha. 



ing or ascending, 1-3-flowered, the longer lower branches 

 empty glumes unequal, lanceolate, the first about 8 mm. long, 1-nerved, the 

 second about as long as the flowering glume, 3-nerved near the base, thin 

 membranous and abruptedly pointed ; flowering glume glabrous, 5-nerved, 

 rounded on the back, 2-toothed at the apex, the teeth awn-like ; callus rather 

 densely bearded, hairs stiff, the longer ones 3-4 mm. long ; awn arising below 

 the apex of the flowei-ing glume, slender, geniculate, twisted below the gen- 

 iculation, about 17 mm. long; palea as long as the flowering glume, rather 

 rigid, margins rounded, inflexed, apex subhyaline, the two nerves extending 

 into subulate awn-like teeth. 



Scribn. 

 1-3 cm. long; 



I 



\ 



