140 ILLINOIS ACADEMY OF SCIENCE 
SaLtsoLa KALL (Salsola Tragus.) Russian thistle. Seed 
conical, embryo coiled, gray; 2 mm. in diameter. In clover 
and alfalfa. Plate IV. 
AMARANTHACEAE. Amaranth family 
AMARANTHUS GRAECIZANS. Tumbleweed. Seed shiny black. 
highly polished, circular with notch at one edge; .7 to .9 mm. 
in diameter. In red clover and grass seed. Plate V. 
AMARANTHUS RETROFLEZUS. Rough pigweed. Redroot. Seed 
similar to Amaranthus graecizans in color, ovate with notch 
at edge; 1 to 1.2 mm. long and .8 to .9 mm. in diameter at base 
end. In red clover and grass seed. Plate V. 
CAROPHYLLACEAE. — Pink family 
STELLARIA MEDIA. (Alsine media.) Common chickweed. 
Seed brownish, three to six curved rows of tubercles, flattened ; 
a groove extending about 1% distance to the center; 1 mm. in 
diameter. In red clover, alsik clover and alfalfa. Plate IV. 
SILENE ANTIRRHINA. Sleepy catchfly. Seed lead colored, four 
to six rows of curved tubercles on each side; .5 mm. in diam- 
eter. In grass and red clover seed. Plate IV. 
CRUCIFERAE. Mustard family 
Brassica ARVENSIA. Chalock. Wild mustard. Seed black, 
spherical with surface finely reticulated; 1.2 mm. to 1.5 mm. in 
diameter. Common impurity of red clover, timothy and 
alfalfa. Plate VI. 
Brassica NicgrA. Black mustard. Seed brownish, globose, 
the surface more coarsely reticulated than the surface of Bras- 
sica arvensis; 1.3 to 1.8 mm. in diameter. In red clover and 
timothy seed. Plate VI. 
LEPIDIUM VIRGINICUM. Wild peppergrass. Tongue grass. 
Common peppergrass. Large peppergrass. Seed reddish to 
yellow, flat, surface granular, two-thirds ovate; 1 to 1.5 mm. in 
diameter. Common impurity of clover, alfalfa, and grass seed. 
Plate I. 
CONVOLVULACEAE. Convolvulus family 
CuscuTA ARVENSIS. Field dodder. Seed yellowish brown, 
ovoid to spherical, ridge on one side, the other rounded; sur- 
face minutely pitted; .6 to 1 mm. in diameter. Common im- 
purity of alfalfa and red clover seed. Plate V. 
