WEED SEEDS FOUND WITH BLUEGRASS SEEDS. 



37 



Found in bluegrass seed of various species, especially common in seed of Kentucky 

 bluegrass. The relatively prominent chalaza and the radially uneven surface dis- 

 tinguish them from the seed of the closely allied Veronica 

 peregrina, which sometimes occurs in commercial seed. 



Juncus tenuis Willd. 



SLENDER RUSH. 



Seeds very minute, about | mm. long, broadly spindle- 

 shaped, the extremities usually slightly curved; surface 

 (as seen under a lens) nearly smooth; color reddish 

 yellow, darker at the extremities, which sometimes bear 

 a small white tissue. (Fig. .31.) 



Often quite abundant in poorly cleaned Kentucky bluegrass seed, sometimes cling 

 ing in bunches of several seeds each. 



Juncoides campestre (L.) Kuntze. 



Fiii. 31. — Seeds of slender rush 

 {Junciiste^mis): a, seeds en- 

 larged; 6, natural size of 

 seeds. 







9 



FIELD RUSH. 



i 



Fig. 32. — Seeds of field rush {Jun- 

 coides campestre): a, different 

 views; b, natural size of seeds. 



Seeds Ij-li mm. long, oval, not flattened, the ex- 

 tremities unequally pointed, the l;)asal extremity turned 

 slightly to one side and consisting of soft white or 

 yellowish tissue; a narrow and often indistinctly de- 

 fined whitish ridge extends from the base to the apex; 

 body of the seed wine-colored and semitranslucent or 

 grayish. (Fig. 32.) 



Found frequently in the seed of wood meadow 

 grass and of the Poa sudetica of European origin. 



Juncoides albida DC 



WOOD RUSH. 



Seeds 1-1 J nim. long, narrowly oval, not flattened; base without an appendage of 

 soft tissue; apex more acutely pointed than the l)ase; 

 a distinct brown or reddish brown ridge joins the base 

 and apex; body of the seed reddish brown or wine- 

 colored, often semitranslucent. ( Fig. 33. ) 



Found in various species of European-grown blue- 

 grass seed. The usually smaller size, absence of the 

 basal appendage, and more distinct and constant re<l- 

 dish-brown lateral ridge serve to distinguish these 

 from the seeds of Juncoides campestre. 



h 



Fig. 33. — Seeds of wood rush (Jun- 

 coides albida) : n, different views; 

 b, natural size of seeds. 



Carex cephalophora Muhl. 



OVAL-HEADED SEDGE. 



Seeds (akenes) I2-2 mm. long, lens-shaped and broadly ovate, contracted at the 

 base and tipped at the apex by a conical appendage (the liase of the style); surface 

 smooth and dull; color varying from light to dark brown; apical appendage often 

 broken away in seeds found in commercial samples; perigynium broadly ovate- 

 lanceolate, plano-convex, the tapering extremity usually rough-edged and notched at 



