I_' Proceedings of the Biological Society of Washington. 



PoACEAE. 



Erianthus saccharoides Michx. Mature fruit, November 2. 



Schizachyrium maritimum (Chapm.) Nash. Immature fruit, Octo- 

 ber 30. The fleshy root stock is usually about 4 inches beneath 

 the surface. 



Andropogon glomeratus (Walt). B. S. P. Mature fruit, October 30. 

 This is a conspicuous plant just back of the beach and in open 

 places generally. 



Andropogon capillipes Nash. Immature fruit, October 30. 



t Sorghastrum linneanum (Hack.) Nash. (Train fallen, October 30. 



Paspalum distich inn L. 



Paspalum vaginatum Sw. Immature fruit. October 30. 



Syntherisma sanguinale (L. ) Dulac. Ripe fruit, some fallen. Octo- 

 ber 30. 



Echinochloa crus-galli (L.) Beauv. Ripe fruir, October 30. 



Echinochloa walteri f Pursh. ) Nash. Ripe fruit, October 30. 



Panicum virgatum L. Ripe fruit, mostly fallen, October 31. 



Panicum amarulum Ilitchc. and Chase. Abundant on the crest of 

 the beach. Seeds said to be a good dove food. Immature fruit. 

 October 30. 



Panicum arenicoloides Ashe. Grain hard but the glumes still green, 

 ( )ctober 31. 



Panicum erectifolium Nash. Ripe fruit, mostly fallen, October 31. 



Panicum commutatum Schult. Nearly mature fruit, October 30. 



Sacciolepis striata ( I>. ) Nash. In flower, October 30. 



Chaetochloa imberbis (Poir.) Scribn. Nearly mature fruit. October 

 31, November 0; quite ripe, October 30. 



Chaetochloa viridis ( L. ) Scribn. Ripe fruit, October 30. 



Chaetochloa magna (Griseb.) Scribn. Ripe fruit, October 30, 1910. 

 Also October 8, 1911, when blackbirds and teal were observed feed- 

 ing upon it. 



Cenchrus carolinianum Walt. Both immature and mature fruits, No- 

 vember 2. One fact relating to this plant, while not of botanical 

 interest, is none the less marvelous. It is almost inconceivable thai 

 any animal can eat a plant filled with the well defended fruits that 

 characterize Cenchrus. The spines strike into human flesh at the 

 least chance and are hard to pull out; one would think no mucous 

 membrane could possibly endure them. Yet cattle and especially 

 mules munch them down in perfect unconcern. 



Zizania aquatica L. Introduced from northern Minnesota, Oshkosh, 

 Wis., and the Apalachicola River, Fla. Little success was had 

 except with the last lot. Seed ripening, October 8, 19J 1. 



Oryza sativa L. One small colony which probably originated from 

 some waste stock food, appears to be well established. 



tAristida mohrii Nash. Covers hundreds of acres. Both immature 

 and mature fruit, November 2. 



Aristida gyrans Chapm. Ripe fruits, mostly fallen, October 31 '. 



Aristida spiciformis Ell. Both immature and mature fruit-, Novem- 

 ber 4. 



