Parr 1, 1909] POACEAE 85 
somewhat similar or reduced in size. Stamens 3. Styles short, not exserted. 
Type species, Coelorachis muricata Brongn. 
Leaf-sheaths round or nearly so, not keeled. 
Blades flat, 2-5 mm. wide, sometimes folded when dry, never semicylindric 
nor convolute. 1. C. cylindrica. 
Blades never flat, 2 mm. or less in diameter. 
First scale of the sessile spikelet smooth ; midnerve of the leaf-blade very 
2 
thick. ; . . tmpressa. 
First scale of the sessile spikelet conspicuously marked with transverse 
undulate ridges. 3. C. loricata, 
Leaf-sheaths compressed, keeled. 
Pedicels without an appendage. 
First scale of the sessile spikelet transversely wrinkled, rarely smooth. 
Wrinkles short, few, but little elevated, tubercle-like, sometimes 
entirely wanting. 4. C. tuberculosa. 
Wrinkles long, often extending completely across the scale, “much 
elevated. 5. C. rugosa. 
First scale of the sessile spikelet pitted or tessellated. 6. C. tlessellata. 
Pedicels with a prominent appendage on one side at the apex. 7. C. vramosa, 
1. Coelorachis cylindrica (Michx.) Nash. 
Tripsacum cylindricum Michx. Fl. Bor. Am. 1: 60. 1803. 
Rottboellia campestris Nutt. Trans. Am. Phil. Soc. II.5: 151. 1834. 
Rottboeila cylindrica Torr. Pac. R. R. Rep. 4: 159. 1857. Not &. cylindrica Willd. 1797, 
Manisuris cylindrica Kuntze, Rev. Gen. 779. 1891. 
Stems from creeping rootstocks, round, 3-10 dm. tall, slender; leaf-sheaths round, 
narrow ; blades 3 dm. long or less, 1-3 mm. wide; racemes finally exserted, 1-2 dm. long, 
' straight or curved, the rachis barely if at all contracted at the nodes; sessile spikelet 4.5-5 
mm. long, about equaling the internode, the first scale more or less pitted in longitudinal 
lines, or rarely unpitted, each pit often containing a subulate hair; pedicellate spikelet re- 
duced to 1 or 2 short scales, the pedicel linear, shorter than the sessile spikelet and curved 
‘around its margin. 
TYPE LOCALITY: Florida. : 
DISTRIBUTION: In sandy soil, at low elevations, Georgia and Florida to Texas, and along the 
rivers to Missouri and Oklahoma. 
ILLUSTRATION: Bull. U. S. Dep. Agr. Agrost. 17: f. 307. 
2. Coelorachis impressa (Griseb.) Nash. 
Rottboellia impressa Griseb. Cat. Pl. Cuba 235. 1866. 
Manisuris impressa Kuntze, Rev. Gen. 780. 1891. 
Stems tufted, branched, up to 1 m. tall, smooth and glabrous; leaf-sheaths round, 
smooth and glabrous, excepting on the ciliate margin near the apex; blades very narrow, 
confluent with the sheaths, up to 4 dm. long, 1-2 mm. wide, the upper portion occupied by 
the very thick whitish midnerve, the margins incurved, making the upper surface of the 
leaf concave, hispid-ciliate; racemes up to 12 cm. long, cylindric, less than 2 mm. in 
diameter ; sessile spikelet, with the basal callus, 4 mm. long, the firgt scale linear-oblong, 
cartilaginous, very obtuse, with a few longitudinal furrows ; pedicellate spikelet reduced to 
2 or 3 scales, usually less than 1 mm. long, the pedicel linear, somewhat curved, shorter 
than the sessile spikelet. 
TYPE LOCALITY : Western Cuba. . 
DISTRIBUTION : Known only from the type locality. 
3. Coelorachis loricata (Trin.) Nash. 
Rottboellia loricata Trin. Mém. Acad. St. Petersb. VI. 2: 250. 1832.. 
Rottboellia filifolia Wright, in Sauv. Anal, Acad. Ci. Habana 8: 209. 1871. 
Stems up to 1 m. tall, simple, smooth and glabrous ; leaf-sheaths smooth and glabrous ; 
blades smooth and glabrous, triangular, the angles rounded, sometimes rounded on the 
‘back, the upper surface grooved, strongly nerved, up to 2 dm. long, 1 mm. in diameter or 
less; racemeé up to 2.5 dm. long, much exserted, about 1.5 mm. in diameter ; sessile spike- 
let 4.5-5.5 mm. long, including the basal callus, oblong-elliptic, obtusely acute, the first 
scale transversely rugose on the back with irregular strongly elevated ridges, cartilaginous ; 
