GMAMINEAE. 31 



2. ERIANTHUS Michx. Plume-grass. 



A\Tn spiral. 1- E. alopecuroides. 



A-n-n straight. 2. E. cor.rpactus. 



1. Erianthus alopecuroides (L.) Ell. M. p. 67. Damp soil. Autumn. 



Burlington— Below Burlington (C). .Giowcesf er—Mickleton, Swedes- 

 boro (C). ^tion <ic—Hammonton (C). 



2. Erianthus compactus Xaah. M. p. 68. Moist soil. Summer. 



J5«cAs— Andalusia, Mart. (Fr.). 



3, ANDROPOGON L. Beard-grass. 



Racemes singly disposed; apex of the rachilla internodes \Yith a translucent, 

 cup-shaped, entire or irregularly-toothed appendage. 

 Spikelets 5-7 mm. long; sheaths of the innovations green. 



1. A. scoparius. 

 Spikelets 8-10 mm. long; sheaths of the innovations strongly com- 

 pressed, glaucous. 2. A. littoralis. 

 Racemes disposed in pairs or more; apex of the raehis internodes unappen- 

 daged. 

 Pedicellate spikelet sterile, of 1 or 2 scales, much smaller than the ses- 

 sile one. 

 Racemes usually protruding from the lateral fissure of the spathe, 

 sometimes more or less exserted from the apex, the peduncle 

 never long exserted. 

 Branches of the inflorescence crowded at the summit of the 

 culm in a dense eorymbiform panicle. 3. A. cori/mbosiis. 

 Branches of the inflorescence scattered along the culm in a 

 long, linear panicle. 4. A. Virginicus. 

 Racemes much exserted on long peduncles. 5. A. argyraeus. 

 Pedicellate spikelet as large as, or larger than the sessile, of 4 scales and 

 a staminate or rarely perfect flower. 6. A. furcatus. 



1. Andkopogon scoparius Michx. M. p. 69. Dry ground. Late simimer. 



2. Andropogon littoralis Nash. M. p. 69. In sand along the seashore. 



Summer. 

 Cape May Stone Harbor (St.). 



3. Andropogon corymbosus (Chapm.) Nash. M. p. 69. Wet soil. Autumn. 



EmcA-s — Bristol (Fr.). Montgomery —:(F.}. Deknvare — Yallej ot 

 Darby Creek (B. Sm.), Concord (W. Tr.). Chester— (F.). Lancaster— 

 (P.). 



New Jersey — Common. 



New Castle— Yrequent. 



4. Andropogon Virginicus L. M. p. 70. Dry or moist fields. Late sum- 



mer. 



5. Andropogon argyraeus Schultes. M. p. 70. Dry sandy soil. Autumn. 



New Casi^e— Railroad below Townsend. 



6. Andropogon furcatus Muhl. M. p. 70. Dry or moist soil. Late sum- 



mer. 



4. SORGHUM Pers. 



1. Sorghum Halepense (L.) Pers. Johnson-grass. M. p. 71. Fields and 

 waste places. Summer. 

 Philadelphia— (P.). jBwcAs— (P.). 



