Part 2, 1912) POACEAE 153 
hairs widely spreading; blades 7-30 cm. long, 5 mm. wide or less, flat, ascending, papillose- 
hirsute; panicle long-exserted, the axis 4-6 cm. long; racemes 6-8, 10-13 cm. long, erect or 
ascending, scattered, or sometimes approximate in pairs, the angles hispidulous and not winged; 
spikelets a little more than 3 mm. long, elliptic-lanceolate, acute, on hispidulous 3-angled 
pedicels, the scales glabrous, the first one wanting, or sometimes present as a minute rudi- 
ment, the second and third scales about equal, the former 5-, the latter 7-nerved, the fruit- 
ing scale a little shorter than the third, elliptic, acute, yellowish-white, finely striate. 
TYPE LOCALITY: Manatee, Florida. 
DISTRIBUTION: Florida and Cuba. 
10. Syntherisma velutinum (DC. ) Chase, Proc. Biol. Soc. 
Wash. 19: 191. 1906. 
Milium velutinum DC. Cat. Hort. Monsp.126. 1813. 
Paspalum velutinum Kunth, Rév. Gram. 27. 1829. 
Stems up to 12 dm. tall, glabrous, rooting at the lower nodes; leaf-sheaths softly pubescent, 
especially the lower ones; blades 6-10 cm. long, 4-7 mm. wide, softly pubescent; inflorescence 
long-exserted, the axis up to 6 cm. long; racemes 7-15, erect or ascending, 6-10 cm. long, the 
rachis with the lateral angles wingless; spikelets 2.5-3 mm. long, in pairs, one on a short, the 
other on a very long, pedicel, elliptic, acute or obtuse, the first scale wanting, the second scale 
a trifle shorter than the spikelet, 5-nerved, pubescent, the third scale about as long as the 
spikelet, 5-nerved, pubescent, the fruiting scale elliptic, greenish, acute. 
TYPE LOCALITY: Mexico. 
DISTRIBUTION : Texas and southern Mexico. 
11. Syntherisma serotinum Walt. Fl. Car. 76. 1788. 
Digitaria serotina Michx. Fl. Bor. Am. 1:46. 1803. 
Paspalum serotinum Fiigge, Gram. Monog. 145. 1810. 
Panicum serotinum Trin. Mém. Acad. St. Petersb. VI. 3?: 203. 1834. 
Stems 2-5 dm. long, tufted, at first simple and erect, at length much branched, prostrate, 
and rooting at the lower nodes; leaf-sheaths a little flattened, the lower ones densely papillose- 
hirsute with spreading hairs; blades up to 10 cm. long, 3-10 mm. wide, flat, lanceolate, more 
or less ascending, pubescent on both surfaces with spreading hairs, the pubescence of two 
kinds, one short and soft, the other longer, rigid, arising from papillae; panicle exserted, the 
axis 1-2 cm. long; racemes 2-6, 2.5-10 cm. long, ascending or nearly erect, alternate, or some- 
times approximate in pairs, the lateral angles of the rachis broadly winged; spikelets about 
1.5 mm. long, elliptic, acute, on pedicels which are terete or nearly so and glabrous, usually 
in pairs, sometimes in 3’s, the first scale wanting, the second about one third as long as the 
spikelet, 3-nerved, the third scale a little shorter than the fruiting scale, both pubescent with 
long appressed hairs, the fruiting scale white, ovate-lanceolate, acute. 
TYPE LOCALITY : South Carolina. . ; 
DISTRIBUTIONS: Pennsylvania and Delaware to Florida, west to Mississippi ; Cuba. 
ILLUSTRATIONS: Bull. U. S. Dep. Apr. Agrost. 7: . 38; Britt. & Brown, Ill. Fl. 3: 496, f. 241a ; 
Kunth, Rév. Gram. f/. 206. 
12. Syntherisma digitatum (Sw.) Hitchc. Contr. U. S. Nat. 
Herb. 12: 142. 1908. 
Milium digitatum Sw. Prodr. 24. 1788. 
Agrostis digitata Poir. in Lam. Encyc, Suppl. 1: 258. 1810. 
Axonopus digitatus Beauv.; R. & S. Syst. Veg. 2: 317. 1817. 
Digitaria setigera Roth; R. & S. Syst. Veg. 2: 474. 1817. 
Panicum horizontale G. Meyer, Fl. Esseq. 54. 1818. 
Digitaria jamaicensis Spreng. Syst. 1: 272, 1825. 
Digitaria setosa Desv.; Hamilt. Prodr. 6. 1825. 
Paspalum digitatum Kunth, Rév. Gram. 24. 1829. 
Panicum stipatum J. Presi, in Presl, Rel. Haenk.1: 297. 1830. 
Panicum Hamiltonti Kunth, Enum. 1: 84. 1833. 
Syntherisma setosum Nash, Bull. Torrey Club 25: 300. 1898. 
Stems 4-10 dm. tall, slender, branching, tufted, at length decumbent at the base and 
rooting at the lower nodes; leaf-sheaths loosely embracing the stems, densely papillose-hir- 
