AGBICULTUEAL SPECIES OF BENT GKASSES. 



23 



absence from domestic seed of seeds cliaracterictic of imported seed 

 and the absence from imported seed of seeds characteristic of domes- 

 tic seed afford additional evidence of the origin of the seed in ques- 

 tion. It was by the presence of certain kinds of seeds and by the 

 absence of others that the 27 samples of imported redtop seed were 

 determined to be of American origin. 



Potcntilla. Dpnap«llenBl8 Llnom Tlrglnlanom tudnlgla alternlfolla I^opUB vlrglnloua 



13 ^ .<«». 14 15 16 



Koellla flozaosa Plaatago ragelll Legooila perfollata BadbeoUa Uxta 



Fig. 10. — Seeds characteristic of American-grown redtop seed and Rhode Island bent seed (enlarged and 

 natural size): 1, Panic grass (Panicum sp.); 2, timothy {PMeum pratense); 3, Fimbristylis laxa; 4, Fim- 

 bristylis autumnalis; 5, club rush (Scirpus sp.); 6, sedges ( Carex spp.); 7, peppergrass (Lepidium virgini- 

 curri); 8, peppergrass {Lepidium apctalum); 9, cinquefoil {Potentilla moTispeliensis); 10, wild yellow flax 

 {Linum virginianum); 11, rattlebox {Ludwigia aUernlfolia); 12, bugleweed {Lycopus virginicus); 13, moun- 

 tain mint (Zbeffia ^eiwoso); 14, black-seeded plantain {Plantago rugelii); 15, Venus's-lookLng-glass (Xe- 

 gouzia perfoliata); 16, black-eyed Susan (Rudbeckia hirta). 



Some of the lots of seed imported as South German mixed bent 

 consisted largely of redtop, and in some instances this redtop seed is 

 strongly suspected of being American seed that had been added to 

 the bent seed. This is consistent with the fact that 18 of the 27 

 samples of imported American-grown redtop seed were brought to 

 this country as South German mixed-bent seed under some trade 

 name in common use, only 4 of the total number being entered as 

 redtop seed. 



