30 Bulletin VII. 1. 



lo. Leaves i to 4 inches long, spikelets three fourths of a line 

 long, flowering glume without any distinct depression on 

 the back 11. P. longipedunxulatum. 



1. Paspalum mucronatum Muhl. (1817.) (Paspalum fluitans Kunth. 



1829.) 



Plate IV. Figure 15. 



An aquatic grass with branched ascending culms from a creeping 

 or floating base, six inches to three feet long^, and numerous slender 

 racemes. Nodes usually bearded. Sheaths lax, smooth, or more 

 or less densely papillate-pilose with spreading hairs; ligule mem- 

 branaceous, sill rt, broadly truncate, auriculate; leaf-blade lanceo- 

 late, acute, one to six inches long, three to seven lines w4de, scab- 

 rous. Racemes ten to fifty, slender, one to three inches long, alter- 

 nate or whorled below, ascendinor; rachis flat, thin, marsfins scab- 

 rous, covering the spikelets and extending beyond them into an 

 acute tip. Spikelets lanceolate-elliptical, subacute, three-fourths 

 line long, biseriate, rather thinly pubescent with minute glandu- 

 lar hairs; outer glumes very thin, two-nerved, nerves nearly mar- 

 ginal, first glume a little longer than the others, the second with a 

 browm spot near the base. 



A form of this species, wnth rather densely pilose sheaths, was 

 collected by Dr. Gattinger at Richland Station in Sumner county, 

 August 27, 1883. It doubtless grows on the Mississippi bottoms 

 along the western borders of the State. Its recorded range is 

 *'river swamps, Virginia to Southern Illinois, Missouri, and South- 

 w^ard." Of no agricultural value. 



2. Paspalum membranaceum Walt. (1788) not of Lam. (1791.) 



[PaspalujH \Valteridnu»i Schult. Paspalum vaginctum Ell.) 

 Plate IV. Figure 16. 



A low, creeping, semi-aquatic grass, with much branched, smooth 

 stems, six to eighteen inches long, with short, flat leaves, and small 

 racemes, the lower ones usually enclosed in the uppermost sheath. 

 Sheaths somewhat inflated, smooth; ligule about one line long, 

 acute; leaf-blade lanceolate or linear, one-half to two inches long, 

 one to two lines wide, acute, rounded at the base, smooth, minutely 

 scabrous on the margins. Racemes two to six on each branch, one 

 terminal, the others alternate below it, one-half to one inch long; 

 rachis flat, thin, one to one and one-half lines wide, many-nerved, 

 smooth, the ciliate-scabrous inflexed margms partially concealing 

 the spikelets, abruptly pointed with a single spikelet at the apex. 

 Spikelets ovate-obtuse, smooth, about one line long, crowded in 

 two rows; outer glumes five-nerved; flowering glume lenticular, 

 rounded-obtuse, a little shorter than the outer ones. 



Low, swampy grounds along the Cumberland river near Nash- 

 ville, (Dr. A. Gattinger), September, 1882. Probably grows in sim- 

 ilar situations at other points within the State, but this is the only 

 recorded station. It ranges from New Jersey to Florida; originally 

 discovered in South Carolina. Of no agricultural importance. 



