32 FLOBA OF PHILADELPHIA. 



5. SOEGHASTEUM Nash. 



1. SOKGHASTRUM AVENACEUM (Michx.) Nash. Indian Grass. M, p. 71. 

 Dry fields. Late summer. 



6.,PASPALUM L. 



Eachis of the racemes very broad, twice the width of the spikelets, or nearly 

 so, which are partially concealed by its inroUed margins. 



1. P. memhranaceum. 

 Eachis of the racemes narrower than the spikelets, not inrolled on the 

 margins. 

 Eacemes 2, approximately in a pair at the summit of the culm; root- 

 stocks extensively creeping ; culms not tufted. 2. P. distichum. 

 Eacemes 1 to several, alternate, culms tufted. 



Culms simple, no branches from the upper sheaths; racemes stout. 

 Spikelets 3 mm. long or less. 3. P. laeve. 



Spikelets 4 mm. long or more. 4. P. glabratum. 



Culms branched, the upper sheath containing from 1-3 branches; 

 racemes slender. 

 Culm densely pilose below the racemes; lower sheaths usually 



glabrous or nearly so. 5. P. pubcsceiis. 



Culm glabrous ; lower sheaths generally hirsute. 



Spikelets 1-1.5 mm. long. 6. P. setaceum. 



Spikelets 2-2.25 mm. long. 7. P. Muhlenhergli. 



1. Paspalum membranaceum Walt. M. p. 73. Low or wet ground. Sum- 



mer. 

 Gloucester— MicklQton. (C). Salevi—Perm Grove (C), Eiddleton (Li.). 

 Caye May— CsiT^e May (C). Atlantic— JjandisviWe (C). 

 New Castle — Col. Andrews. 



2. Paspalum distichum L. M. p. 73. Wet fields. Summer. 



Camden— Kaighn's Point, I. Burk (Fu.). 



3. Paspalum laeve Michx. M. p. 73. Moist soil. Summer. 



4. Paspalum glabratum (Engelm.) Mohr. M. p. 73. Moist soil. Summer. 



Cape Ifai/— Cape May (Li.) (XJ. C. S.), Anglesea, Dr. J. B. Brinton 

 (He.). 



5. Paspalum pubescens Muhl. M. p. 74. In fields. Summer. 



Montgomery— WiWow Grove (P.). Delaware— TUnieum, Crum Creek 

 (St.). Chester— 1^. Bradford Twp. (St.). 



6. Paspalum setaceum Michx. M. p. 74. Dry fields. Summer. 



7. Paspalum Muhlenbergii Nash. M. p. 75. Sandy or stony ground. 



Summer. 

 Philadelphia— (P.). ^itcAs—Penn Valley (Fr.). Delaivare—Tinicum. 

 (P.). Chester— (P.). Lancaster— {P.). Northa7npton—(P.). 



7. AMPHICAEPON Eaf. 



1. Amphicarpon Amphicarpon (Pursh.) Nash. M. p. 76. Moist pine bar- 

 rens. Summer. 



8. SYNTHEEISMA Walt. 



Eachis of the racemes with the angles wingless; first scale of the spikelet 

 wanting, or sometimes present as an inconspicuous rudiment. 



1. S. filiformis. 



