292 POACE^. 



5-7 cm. long, their branches very slender, bearing single-pedicelled 

 spikelets which are light lead-color. Empty glumes elliptical or 

 ovate-lanceolate, 1-nerved, first about 2 mm. long, second 2.5-3 

 mm. long; floret clothed with hairs on the nerves, 0.5 mm. long; 

 floral glume ovate, acute or obtuse, 3-nerved, 2.7 mm. long; palea 

 nearly as long, though narrower. 



Arizona, Lemmon 376, Jones; Mexico, Prioigle 822. 



13. S. Jacquemoxtii Kunth, Rev. Gram. 2:427 (1829). 



A tufted slender erect perennial, 60-90 cm. high. Sheaths a 

 little over half the length of the internodes; ligule very short; 

 leaves of sterile shoots few, those of the culm 4, erect, involute, 

 scabrid above, 10-15 cm. long, 2 mm. wide. Panicle exserted, 

 erect, spreading, at length contracted, about 20 cm. long, rays 

 slender, scattered or in twos and threes, the longest 3-4 cm. long, 

 bearing scattered appressed spikelets for the entire length. Spike- 

 lets light brown, empty glumes broad, first a little less, the second 

 a little more than 0.5 mm. long, the latter 1-nerved; floral glume 

 ovate, acute, obscurely 3-nerved, 1.5 mm. long; palea oblong, trun- 

 cate-erose, 1.5 mm. long. Grain oblong, 1 mm. long. 

 U. S. Dept. Agricul., collected in Jamaica. ^ ' 



A good pasture-grass in Jamaica. Haiti, etc., where it is found. 



14. S. tenacissimus Beauv. Agrost. 26 (1812). Vilfa tenacissi- 

 ma, H. B. K. Xov. Gen. et. Sp. 1: 138 (1815). Liendkilla. 



An erect stout grass, 90-140 cm. high; culms smooth. Sheaths 

 smootli; ligule less than 1 mm. long; blades smooth except the 

 upper side, those of sterile slioots 60 cm. or more long, those of the 

 culm 4 in number, 15-35 cm. long, 5-7 mm. wide at the base, taper- 

 ing into fine points. Panicle but little exserted, erect, 30-50 cm. 

 long, 1-2 cm. diam., some of the lower appressed, rays 7-12 cm. 

 long, those above gradually becoming shorter. Spikelets very 

 numerous and crowded; empty glumes almost hyaline, obtuse, 1- 

 nerved, first 0.7 mm. long, second 1-2 mm. long; floral glume oval 

 when spread, concave, 3-nerved, 2.3 mm. long; palea nearly as long 

 as its glume, 2-nerved. Grain broadly obovoid, pericarp persistent. 



Mexico, Palmer 205. 



Dr. Palmer reports that the Mexicans twist these grasses into 



