MANUAL OF THE GRASSES OF THE UNITED STATES 



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Perennial; culms in 



3 times as long as the spikelet; glumes acute, 1 to 1.2 and 1.2 to 1.4 

 mm long; lemmas turgid, obscurely nerved, 1.8 to 2 mm long, usually 

 bronze-tipped, not hyaline margined; grain oblong, about 0.7 mm 

 long. % — Dry or sandy prairies, Georgia ; Louisiana and Missouri 

 to southern California and south to Central America (fig. 323). 

 A few specimens from New Mexico have long spikelets (as much as 

 13-flowered) and glabrous axils. 



36. Eragrostis swalleni Hitchc. (Fig. 324.) 

 dense tufts, erect, 20 to 50 cm tall, an obscure 

 glandular band below the nodes; sheaths spar- 

 ingly pilose at the throat; blades involute, 

 glabrous, arching-recurved, 10 to 30 cm long; 

 panicle erect, open, 10 to 20 cm long, the 

 branches ascending or spreading, glabrous, 

 stiffly flexuous; spikelets oblong to linear, 

 stramineous or grayish-green, 7 to 10 mm long, 

 about 2 mm wide, mostly 8- to 12-flowered, the 

 slender pedicels bearing above the middle a glandular band or spot; 

 glumes acutish, rather broad, about 1.2 and 1.8 mm long; lemmas 

 rather closely imbricate, acutish, about 2 mm long; palea minutely 

 scabrous on the keels ; grain nearly smooth, slightly narrowed toward 

 the summit, 1 mm long. % — Sandy prairies, southern Texas. 

 Known only from Sarita and nearby Riviera. 



37. Eragrostis tracyi Hitchc. (Fig. 325.) Apparently perennial; 

 culms erect, tufted, 30 to 80 cm tall; sheaths rather sparsely pilose 



Figure 323.— Distribution of 

 Eragrostis intermedia. 



Figure 324.— Eragrostis swalleni. Plant and panicle, X 1; floret, X 10. (Type.) 



at the throat; blades flat or, especially of the innovations, involute, 

 5 to 25 cm long, 1 to 3 mm wide; panicle erect, open, 10 to 15 cm long, 

 5 to 8 cm wide, the axils glabrous or nearly so, the branches ascending 

 to spreading, flexuous; spikelets linear, mostly 9- to 15-flowered, 5 to 10 

 mm long, about 1.5 mm wide, pinkish or purplish, the flexuous pedicels 

 spreading, 2 to 5 mm long; glumes acutish, about 1 mm and 1.5 mm 

 long; lemmas 1.5 to 2 mm long, rather soft, loosely imbricate, the 

 lateral nerves distinct; palea somewhat persistent; grain about 0.7 

 mm long. % — Sandy soil, known only from Sanibel Island, Fla. 



