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 l-several raceme-bearing naked branches from the uppermost sheath. 

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



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. 

 Spikelets elliptic, 2 mm. long, sparsely pubescent 

 with long appressed hairs. 

 Stems single, on a scaly rootstock. 

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

 below. 

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



tlie second scale present. 

 Spikelets ovate-lanceolate, 3-1 mm. long, glabrous : 

 midvein of the rugose second scale suppressed. 



1. P. ciliatifolium Michx. 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 Nash. 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 Nash. 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 Na.sh. Stems 4-8 dm. tall: leaf -blades lanceolate, glabrous on 

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

 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- 



