GRAMINEAE. 75 



duncles from the same upper sheath; spikelets about 1.5 mm. long, in 2 narrow 

 rows, broadly obovate, very obtuse; empty scales 3 -nerved, glabrous or pubescent; 

 third scale obovate, shining. In dry fields, N. H. and Mass. to 111., south to Fla. 

 and Tex. Aug. -Sept. 



16. Paspa urn Muhlenbergii Nash. Muhlenberg's Paspalum. (I. F. 

 f. 232.) Culms tufted, at first erect, at length reclining, 4-8 dm. long. Sheaths 

 usually hirsute all over; leaves 5-20 cm. long, usually 7-11 mm. wide, sometimes 

 narrower, ciliate on the margins with generally long hairs, more or less pubescent on 

 both surfaces with similar hairs; racemes solitary or in 2's, 5-10 cm. long; spikelets 

 in pairs, glabrous, about 2 mm. long and 1.8 mm. wide, oval or broadly obovate, the 

 empty scales 3-nerved, or the second rarely 2-nerved by the suppression of the mid- 

 nerve. In fields or in sandy or stony ground, Mass. to Mo. and Ind. Terr., south 

 to S. Car., Ga. and Miss. Aug. -Oct. {Paspalum ciliatifolium Michx. in part.) 



17. Paspalum dasyphy'llum Ell. Hairy-leaved Paspalum. Plant yellow- 

 ish green. Culms tufted, 2-6 dm. tall; sheaths, as well as both surfaces of the 

 leaves, densely pubescent with long, yellowish, spreading hairs ; leaves erect or 

 ascending, thick, 2 dm. or less long, usually 1-2 cm. broad; racemes on the main 

 culm in 2's or 3's, 4.-10 cm. long; spikelets in pairs, 2-2.2 mm. long and about 

 1.8 mm. wide, broadly obovate, the first scale generally pubescent, 3-nerved, the 

 second scale glabrous, usually 2-nerved or sometimes 3-nerved. In dry, usually 

 sandy, places, S. Car. to Fla. ; also in Mo. June-Sept. {Paspalum ciliatifolium 

 Michx. in part.) 



10. ANASTROPHUS Schlecht. 



Perennial grasses, with the culms usually rooting at the lower nodes, with flat 

 leaves and 1 -flowered spikelets, borne singly in 2 rows in one-sided spikes which 

 (in our species) are disposed in a single pair at the summit of the culm, or some- 

 times with an additional one a short distance below. Spikelets oblong to lan- 

 ceolate, convex on the outer surface, flat on the inner. Scales 3, the outer 2 

 membranous, the inner one firm and with its opening turned toward the rachis, 

 subtending a perfect flower. Stamens 3. Styles separate. Stigmas plumose. 

 Grain free. [Greek, signifying turned around, referring to the spikelets.] 



Spikelets less than 2 mm. long, oblong. 1. A. compressus. 



Spikelets about 4 mm. long, broadly lanceolate. 2. A. paspaloides. 



1. Anastrophus compressus (Sw.) Schlecht. (I. F. f. 236.) Stolons nu- 

 merous, leafy, sometimes 6 dm. long. Culms 1.5-6 dm. tall, slender, compressed, 

 glabrous; sheaths loose; leaves glabrous, sometimes sparsely ciliate, obtuse, those 

 of the culm 5-10 cm. long, 4-6 mm. wide, those of the stolons about 2.5 cm. long, 

 2-4 mm. wide; spikes 2-5, 2.5-5 cm - l° n g> approximate at the summit of the long 

 and slender stalk ; spikelets not crowded nor secund, about 2 mm. long, acute. 

 Va. to Fla. and west to La. Widely distributed in tropical America. Probably 

 not native in the U. S. Aug. -Sept. {Paspalum compression Nees.) 



2. Anastrophus paspaloides (Michx.) Nash. (I. F. f. 237.) Culms 3-7.5 

 dm. tall, from an extensively creeping base. Sheaths and leaves glabrous or 

 pubescent, the latter 5-22 cm. long, 6-12 mm. wide, obtuse; spikes 3.75-8.75 cm. 

 long, in pairs, or sometimes with an additional one; rachis flat, about I mm. wide; 

 spikelets about 4 mm. long, broadly lanceolate, acute, not crowded ; outer scales 

 5 -nerved, glabrous. Moist ground, Md. to Fla., west to Tex. July-Aug. {Pas- 

 palum paspaloides Scribn. P. Elliottii S. Watson.) 



11. AMPHICARPON Raf. 



Erect perennial grasses, with flat leaves and spikelets of two kinds ; one kind 

 borne in terminal panicles, deciduous without perfecting fruit ; the other solitary, 

 terminating subterranean peduncles, and maturing seed. Scales 3, membranous, 

 the innermost subtending a palet and a perfect flower ; the scales of the subter- 

 ranean spikelets become indurated and enclose the grain. Stamens 3. Stigmas 

 plumose. [Greek, in allusion to the two kinds of spikelets.] Species 2, inhabiting 

 the southeastern U. S., one of them restricted to Fla. 



