Fig 110. [White Sweet Clover. Melilotus alba Desv.]

White Sweet Clover. Melilotus alba Desv. Flowers white; pods straw-color to brown, coarsely and irregularly reticulate-ridged or wrinkled; seeds smooth, dull, yellowish or greenish, more strictly elliptical-oblong in outline than those of red clover and alfalfa, bearing the broad, shallow notch near one extremity; 2–2.2 mm. long. Introduced from Europe. Seeds used to adulterate those of alfalfa.

Fig 111. [Alsike Clover. Trifolium hybridum] L.

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.

Fig 112. [Crimson Clover. Scarlet Clover. Trifolium incarnatum] L.