POACEAE. 9 



4 scales, the outer 2 indurated, often hairy, the third and fourth scales hyaline, 

 the latter long-awned, the awn spiral at the base. Lodicules glabrous. 



1. S. secundum (Ell.) Nash. Stems 8-14 dm. tall: panicle 2-4 dm. long, one- 

 sided, the ultimate divisions much curved, making the spikelets reflexed: 

 spikelets 6-8 mm. long, the awn twice bent, closely spiral to the second bend, 

 thence loosely twisted, the column very much exserted. Pinelands, L. keys. 



5. PASPALUM L. Erect or diffuse plants with an inflorescence composed 

 of one or more unilateral racemes, arranged singly, in pairs, or in panicles. 

 Spikelets 1-flowered, obtuse, or rarely short-acuminate, nearly sessile or short- 

 pedicelled, singly or in pairs, on one side of a narrow and usually winged 

 rachis. Scales 3 or rarely 4. 



Stem with 1-several raceme-bearing naked branches from the uppermost sheath. 

 Leaf-blades conspicuously ciliate. 1. P. ciliatifolium. 



Leaf-blades not ciliate. 



Spikelets glabrous. 2. P. epile. 



Spikelets with the first scale pubescent. 3. P. Helleri. 



Stem simple, without raceme-bearing branches from the upper 



sheath. 



Racemes 2-several, but not in pairs. 

 Stems tufted. 



Spikelets obovate. 1.5 mm. long, pubescent with 



spreading glandular-tipped hairs. 4. P. Simpsonii. 



Spikelets elliptic, 2 mm. long, sparsely pubescent 



with long appressed hairs. 5. P. caespitosum. 



Stems single, on a scaly rootstock. 6. P. monostachyum. 



Racemes in pairs, or rarely in 3's, or with another raceme 



below. 

 Spikelets ovate, 2.5-3 mm. long, pubescent : midvein of 



the second scale present. 7. P. distichum. 



Spikelets ovate-lanceolate, 3-4 mm. long, glabrous : 



midvein of the rugose second scale suppressed. 8. P. vaginatum. 



1. P. ciliatifolium ilichx. Stems tufted, 4-8 dm. tall: leaf -sheaths ciliate on 

 the overlapping margin; blades smooth and glabrous on both surfaces: racemes 

 single, or sometimes in 2 's, 5-11 cm. long: spikelets in pairs, 1.5-1.8 mm. 

 broad, oval to broadly obovate. Hammocks, U. keys. [E. K.] (Ber.) 



2. P. epile Xash. Stems 6-8 dm. tall, like the rest of the plant, glabrous: 

 leaf -blades thick, firm, linear-lanceolate: racemes single or in pairs, 6-10 cm. 

 long: spikelets in pairs, 2 mm. long and about 1.5 mm. wide, broadly obovate. 

 Hammocks, Key West. (Ant.) 



3. P. Helleri Xash. Stems 6-8 dm. tall : leaf -blades densely pubescent with long 

 hairs above at the very base: racemes in 3's, 10-13 cm. long: spikelets about 

 2.2 mm. long and 1.3 mm. wide. Hammocks, Key "West. (Bah., Cuba, Ant.) 



4. P. Simpsonii Xash. Stems 4-8 dm. tall: leaf -blades lanceolate, glabrous on 

 both surfaces, ciliate on the margins below the middle: racemes 3-5, spreading, 

 2-7 cm. long: spikelets about 0.8 mm. wide. Pinelands and edges of ham- 

 mocks, L. keys. [E. K.] (Bah., Cuba, Ant.) 



5. P. caespitosum Fluegge. Stems 3-6 dm. tall: leaf -blades narrowed at both 

 ends: racemes erect, 2-6, 1.5-6 cm. long, slender, the rachis flat, winged, about 

 0.5 mm. broad, about one-half as wide as the spikelets: spikelets about 1 mm. 

 broad. Pinelands and edges of hammocks, L. keys. [E. K.] (Ber., Bah., 

 Cuba, Ant.) 



6. P. monostachyum Vasey. Stems rigid, 6-10 dm. tall: leaf -blades elongate, 

 stiff, involute, at least when dry, long-acuminate, glabrous: racemes solitary, 

 or rarely 2 together, 1-2 dm. long, erect: spikelets in pairs, 3 mm. long and 

 about 1.5 mm. wide, elliptic. Lime-sinks, L. keys. [E. K.] 



7. P. distichum L. Stems 1-6 dm. tall: leaf-sheaths usually crowded and 

 overlapping, especially at the base and on the innovations ; blades generally gla- 



