=Three-Seeded Mercury.= _Acalypha Virginica_ L. Seeds 1.3-1.8 mm. long oval or obovoid, dull, light to dark reddish brown or gray, mottled with black spots, surface covered with numerous irregular vertical lines, a ridge (hilum) extending from the pointed end for about one-third the length, continuing to the broad extremity as a dark line (raphe). Native to this country. Moist land.
=Cypress Spurge.= _Euphorbia Cyparissias_ L. Seeds dull, light lead or ash-colored, oval or oblong, circular in transverse section, 1.5-2 mm. long, not including an irregular yellowish appendage (caruncle) at the base, a dark verticle line (raphe) extending along one side. Introduced from Europe. Thriving on thin sandy soil.
=Toothed Spurge.= _Euphorbia dentata_ Michx. Seeds ash colored, obovoid, or globose, inconspicuously four-angled, base obtuse, irregularly tuberculate, 1 mm. or more long. It thrives in the Botanic Garden and very likely may soon spread onto Michigan farms.
=Leafy Spurge.= _Euphorbia Esula_ L. Seeds dull, light drab colored, broad-oval, narrowed at one end, nearly circular in transverse section, 2.3 mm. long, not including a wrinkled bunch (caruncle) at the base, a dark vertical line (raphe) extending above one side opposite which is another ridge the color of the seed. Introduced from Europe.
_Euphorbia hirsuta_ (Torr). Weigand. Seeds lead colored, obovoid approximately square in transverse section with one side narrower than the others, 4-10 irregular transverse ridges on each side, the raphe standing along one corner, about 1.2 mm. long by 7 mm. wide. Sandy soil.
=Spotted Spurge.= _Euphorbia maculata_ L. Seeds obovoid-oblong, nearly square in cross-sections, minutely pitted and transversely wrinkled with 2-5 broken wavy ridges, a fine dark vertical line (raphe) along one corner, color reddish drab, .6-.8 mm. long. Probably introduced from west of the Rocky Mountains.
=Upright Spotted Spurge.= _Euphorbia Preslii_ Guss. _Euphorbia nutans Lag._ Seeds lead-colored obovoid-oblong, with 4 unequal sides as seen in cross-section, pitted and transversely wrinkled, with 2-5 broken wavy ridges, a fine dark, verticle line (raphe) along one corner, 1-1.3 mm. long. Native of eastern North America. Introduced in seeds of red clover.