48 FLORA OF PHILADELPHIA. 



46. ELETTSINE Gaertn. 

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

 Fields and waste places. Summer. 



47. DACTYLOCTENIUM Willd. 

 1. Dacttloctenium Egyftium (L.) Willd. Crab-grass, Yard-grass. M. p. 



123. Cultivated grounds and waste places. Late summer. 

 ; Philadelphia— Philadelphia Salt Works, I. Burk , (He.). Delaware— 

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



48. PHEAGMITES L. 

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

 Autumn. 

 Philadelphia— Point Breeze (P.). Delaware — Crum Creek, Dr. Geo. 

 Smith (B. Sin.). Chester— (P.). 

 New Jersey— Frequent. 

 New Castle— Frequent. 



49. TBICUSPIS Beauv. 



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

 Summer. 



50. TBIPLASIS Beauv. 



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

 Late summer. 

 Delaware— Tinicum (Fu.), Valley of Darby Creek (B. Sin.). 

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

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



51. DIPLACHNE Beauv. 



1. Diplachne fascicularis (Lam.) Beauv. M. p. 128. Brackish meadows. 

 Summer. 

 New Jersey — Common. 

 New Castle— Port Penn, Commons. 



52. EEAGEOSTIS 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. 

 Spikelets 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; spjkelets 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. 



