granular, gray, closely fitting the seed; seed
jet-black, shining, flattened, nearly circular, edge bluntly rounded,
and notched in one place, a groove leading from one side of a margined
protuberance part way to the center of the face, 1.5-1.8 mm. in
diameter. Introduced from Europe. Seldom troublesome.

[Illustration: Fig. 46.]

=Pigweed. Lamb's Quarters.= _Chenopodium album_ L. Seeds are likely to
occur in either of three different guises dependent upon the degree of
their ripeness or the amount of threshing to which they have been
subjected. The figure shows these conditions admirably.

Seeds black, dull or somewhat glistening, gray if not pretty clean;
nearly circular; somewhat lens-shaped, one side usually more nearly
flattened than the other 1-1.4 mm. in diameter, the edge bluntly
rounded, the more convex side bearing a curved groove leading from one
side of the marginal protuberance to near the center of the face,
surface finely uneven, often with a faintly evident radiating striation.
Introduced from Europe. Very common in annual crops.

[Illustration: Fig. 47.]

=Mexican Tea.= _Chenopodium ambrosioides_ L. Note remarks under last
preceding description concerning different stages of cleaning. Seeds
smooth, shining, reddish brown, to black, thickly double convex with
scarcely a trace of a hem-like margin, circular, short kidney-shaped or
ovate with a notch on the edge, .6-.8 mm. long. Introduced from tropical
America. Not prominent.

[Illustration: Fig. 48.]

=Jerusalem Oak.= _Chenopodium Botrys_ L. Concerning different states of
cleaning, note remarks above under C. album.

Seeds perfectly cleaned with great difficulty, brown to black or gray,
when imperfectly cleaned, slightly flatted on two sides, circular or
round, kidney-shaped, sometimes with a hem-like margin, on one side a
faint groove from the margin to near the center of the face, .6-.8 mm.
in diameter. Introduced from Europe. Not prominent.

[Illustration: Fig. 49.]

=Oak-leaved Goosefoot.= _Chenopodium glaucum_ L. Concerning the
different stages of cleaning note remarks above under C. album.

Seeds brown to black, more or less slightly granular, shining, flattened
on two sides, circular edge bluntly rounded, with a single notch from
which on one side extends a slight depression toward the center of the
face, .5-.8 mm. in diameter. Introduced from Europe. Occasional on moist
soil.

[Illustration: Fig. 50.]

=Maple-leaved Goosefoot.= _