n of other
animals. Being a legume, it is helpful in enriching the land, and being
a free grower, it improves the soil mechanically through its root
growth, and also through the stems and leaves, when these are plowed
under.

=Distribution.=--Burr clover is said to be native to Europe and North
Africa, but not to North America, although it has shown high adaptation
in adapting itself to conditions as found in the latter.

Although this plant is hardy in the South, and, as previously stated,
makes most of its growth in the winter, it is not sufficiently hardy to
endure the winters far northward. Its highest adaptation is found in
States around the Gulf of Mexico. It also grows with more or less vigor
as far north as North Carolina, Tennessee and Arkansas. For these States
its adaptation is, on the whole, higher than crimson clover, although
where the latter will grow readily it is considered the valuable plant
of the two.

For Canada, burr clover has no mission, owing to the sternness of the
winter climate in that country.

=Soils.=--While burr clover will grow with more or less success on
almost any kind of soil possessed of a reasonable amount of fertility
and moisture, it is much better adapted to soils alluvial in character
and moist, as, for instance, the deposit soils in the bottom of rivers.
Its power to fight the battle of existence on poor lands is much less
than that of Japan clover, but on soils that grow crops, such as corn or
cotton, it may be made to render a service which the other cannot,
since it grows chiefly in winter and early spring, whereas Japan clover
grows in the summer and early autumn, when cultivated crops occupy the
land.

=Place in the Rotation.=--Burr clover is grown more in the sense of a
catch crop and for pasture than in that of a crop to be marketed
directly. Since it is grown in the winter and spring, it may be made to
come in between various crops. On good producing lands of the South it
has given satisfaction as a pasture plant for winter for many successive
years without re-sowing by hand, when sown in conjunction with crab
grass (_Panicum sanguinale_) for hay. Dr. Phares grew it thus in
Mississippi for about 20 years. In June crab grass sprang up on the
ground, and being cut when in blossom, produced a good crop of hay in
August. A lighter cutting was again taken in October. The clover then
took possession of the land and was grazed until spring, but not so
closely as to pre