=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 of red clover are half anatropous. Common and well known, possibly native to the northern country. GERANIUM FAMILY. GERANIACEAE. [Illustration: Fig. 116.] =Alfilaria. Storks-bill.= _Erodium cicutarium_ (L.) L'Her. Flowers pink; achenes reddish brown, hairy, lance-shaped, the smaller end curved, hard, sharp, the larger end when mature bearing an awn spirally coiled for half its length, the sickle like apex turned to one side. Achenes 5-6 mm. long, the coiled portion and cycle-like apex each 10-15 mm. long. True seed light brown, ovoid-lanceolate 2.5-2.7 mm. long. Introduced from Europe. This plant is not yet common in our state, but, judging from its behavior in the botanic garden, it is destined soon to become a bad weed. On the desert ranches of Arizona, Nevada and elsewhere, it furnishes much pasture. [Illustration: Fig. 117.] =Cut-leaved Crane's bill.= _Geranium dissectum_ L. Seed light brown, broadly oval or ovoid, surface deeply pitted requiring 25-30 pits to form one row transversely about the surface. Seed scar at the larger end from which extends a slight vertical ridge reaching nearly one-third the length of the seed. Introduced from Europe, becoming common. [Illustration: Fig. 118.]