48 FLOBA OF PHILADELPHIA. 



46. ELEUSINE Gaertn. 

 1. Eleusine Indica (L.) Gaertn. Wire-grass, Crab-grass. M. p. 124. 

 Fields and waste places. Summer. 



47. DACTYLOCTENIUM WUld. 

 1. DACTYLOCTENIUM Egyptium (L.) Willd. Crob-grass, Yard-grass. M. p. 

 123. Cultivated grounds and waste places. Late summer. 

 PMZa(^eZp/iia— Philadelphia Salt Works, I. Burl- (He.). Delaware — 

 Avondale, Dr. Geo. Smith (Fu.). 



48. PHEAGMITES L. 

 1. Phragmites Phragmites (L.) Karst. Reed. M. p. 126. Wet places. 

 Autumn. 

 Philadelpliia—'Pomt Breeze (P.). Delatvare—Crnm Creek, Dr. Geo. 

 Smith (B. Sm.). Chester— (P.). 

 New Jersey — Frequent. 

 New CasiZe— Frequent. 



49. TKICUSPIS Beauv. 



1. Tricuspis seslerioides (Michx.) Torr. Tall Bed-top. M. p. 127. Fields. 

 Summer. 



50. TRIPLASIS Beauv. 



1. Triplasis purpurea (Walt.) Chapm. Sand-grass. M. p. 127. In sand. 

 Late summer. 

 Delaware— Tinidum (Fu.), Valley of Darby Creek (B, Sm.). 

 New Jersey — Sea beaches and sands of the yellow drift (C). 

 Neiv CasiZe— Collins, New Castle, Port Penn, Commons. ,, 



51. DIPLACHNE Beauv. 



1. DiPLACHNE FASCicuLARis (Lam.) Beauv. M. p. 128. Brackish meadows. 

 Summer. 

 New Jersey — Common. 

 Neiu Castle— 'Port Penn, Commons. 



52. ERAGROSTIS Beauv. 



Culms often decumbent at the base and generally branched, 4-5 dm. tall or 

 less ; usually annuals. 

 Spikelets 2-5-flowered, 2-3 mm. long. 



Culms branched only at the very base ; pedicels and branches of the 



panicle long and capillary. 1. E. capillaris. 



Culms branched above the base; pedicels and branches of the pan- 

 icle short. 2. E. Frankii. 

 Sj)ikelets 5-many-flowered, 3-16 mm. long. 

 Spikelets 1.5 mm. wide or less. 



Flowering scales thin, usually bright purplish, the lateral nerves 

 faint or wanting; spikelets about 1 mm. wide. 



3. E. pilosa. 

 Flowering scales firm, usually dull purple or green, the lateral 



nerves very prominent ; spikelets about 1.5 mm. wide. 



4. E. Purshii. 



