Europe. Seeds used to adulterate those of alfalfa.

[Illustration: Fig. 111.]

=Alsike Clover.= _Trifolium hybridum_ L. Seeds dull yellowish green to
very dark green, some of them mottled, lighter about the seed scar,
flattened, one of the rounded edges thicker than the other, and between
the two a slight groove on each side; seed rounded at one end, the other
truncate with the seed scar in the middle of the truncate end. Some
seeds are half anatropous, resembling in shape those of red clover;
1.3-1.2 mm. in diameter. When compared with white clover, these seeds
are larger and thicker. Introduced from Europe.

[Illustration: Fig. 112.]

=Crimson Clover. Scarlet Clover.= _Trifolium incarnatum_ L. Seed smooth,
shining when not old, color light yellow to reddish yellow or brown,
oval, scar about one-third the distance from the narrow end,
three-fourths anatropous, 2-2.5 mm. long, very slightly compressed.

[Illustration: Fig. 113.]

=Red Clover.= _Trifolium pratense_ L. Seeds usually dull, pure light
yellow to purple, flattened, ovoid, having the seed scar near the middle
of one edge or below the middle, half anatropous, a slight depression on
each side from the scar toward the broad end, the short edge thinner
than the long edge, 1.5-1.8 mm. long by 1.x1.4 mm. wide. Very common.
Introduced from Europe.

=Mammoth Clover= is a variety or race or red clover, the seeds of which
are indistinguishable from the seeds of red clover. As a rule they are
darker in color and rather smaller. Red clover and mammoth clover are
usually much mixed.

[Illustration: Fig. 114.]

=Low Hop-clover.= _Trifolium procumbens_ L. A low, yellow-flowered
annual, often becoming a tumble-weed at maturity. Seeds plump, shining,
straw-colored to light brown, broad oval, very slightly flattened, 1 mm.
long, three-fourths anatropous, i. e., the scar is a very little
distance from one end of the seed. A little way back of the scar on each
side is a light-colored depression. Rather rapidly spreading. From
Europe.

[Illustration: Fig. 115.]

=White Clover.= _Trifolium repens_ L. Seeds scarcely shining, yellow to
light brown, flattened, one of the rounded edges thinner than the other,
and between the two a slight groove on each side, one end rounded, the
other truncate with a slight depression in the center containing the
seed scar 1.-1.2 mm. long to 1 mm. wide. The seeds that are truncate at
one end are anatropous, some of them resembling those