12 POACEAE. 



Stems tufted. 



Spikelets 3 mm. long or less. 



Spikelets obovate, 1.5 mm. long, pubescent with 



spreading glandular-tipped hairs. 3. P. Siinpsonii. 



Spikelets elliptic, 2 mm. long, sparsely pubescent 



with long appressed hairs. 4. P. cacspitosiim. 



Spikelets more than 3 mm. long. 5. P. yiijunieum. 



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



1. P. ciliatifolium Micbx. 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. — F. K. (Ber.) 



2. P. rigidifolium Nash. Stems tufted, 3-8 dm. tall: leaf-blades erect or 

 ascending, glabrous: racemes single, or rarely in 2 's, 6-13 cm. long: spikelets 

 in pairs, 2.3-2.5 mm. long, 1.7-2 mm. wide, the second scale glabrous. — Ever- 

 glades and hammocks. — (Ciiba.) 



3. P. Siinpsonii Nash. Stems 4-S 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. — Everglades and pinelands. — F. 

 K. (Bah., Cuba, Ant.) 



4. 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. — Everglades and pinelands. — F. K. {Ber., Bah., Cuba. Ant.) 



5. P. giganteum Baldw. Stems 1-1.5 m. tall: leaf-blades erect, the lower 

 ones 2-3 dm. long, 1.5-2 cm. wide: racemes 3-5, 1-1.5 dm. long: spikelets in 

 pairs, about 3.25 mm. long and 2.5 mm. wide. — Everglades. 



6. P. monostachyum Vasey. Stems rigid, erect, 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. [P. solitarium Nash.] — Everglades. — 

 F. K. 



11. ERIOCHLOA H.B.K. Erect ]dants with an inflorescence of spike-like 

 one-sided racemes which are racemosely arranged. Spikelets imbricated, 

 arranged in 2 rows on a flat rachis, acute or acuminate. Scales 3, the 2 outer 

 membranous, appressed-pubeseent, empty, the third scale glabrous and shining, 

 shorter, at length indurated, awn-pointed or short-awned at the apex. 



1. E. Michauxli (E. & S.) A. Hitchc. Stems single, 7-15 dm. tall: leaf- 

 sheaths glabrous or softly pubescent; blades 1-4.5 dm. long, 4-15 mm. wide: 

 inflorescence 1.5^ dm. long: racemes 8-20, 3-15 cm. long: spikelets 12-40, 

 5-5.5 mm. long, ovate, the third scale about 3.5 mm. long, rather finely trans- 

 verse-rugose. [Panicu7n molle Michx.] — Pinelands. — F. K. 



11a. VALOTA Adans. Perennial grasses with narrow densely hairy 

 panicles. Spikelets lanceolate, acute or acuminate. Scales 4, the outer 3 mem- 

 branous, empty, the second and usually also the much shorter first one densely 

 silky-pilose or long-ciliate, sometimes with a short bristle at the apex, the 

 fourth scale shorter, chartaceous, glabrous and shining, finally indurated. 

 [Trichacline Nees.] 



1. V. insularis (L.) Chase. Stems 1-1.5 m. tall: leaf-blades 1-3 dm. long: 

 panicle usually 2-3 dm. long, 1-2 cm. wide: spikelets 4-5 mm. long, long- 

 acuminate. — Everglades and waste grounds. — F. K. {Ber., Bah., Cuba, Ant.) 



