=Self-heal. Heal-all.= _Prunella vulgaris_ L. Achenes light to dark brown, slightly roughened, having a diffused luster, slightly flattened, oval or oblong, the base tapering to a small whitish, triangular appendage, outer side convex having dark verticle lines, the other face sloping to the edges from a central ridge, becoming mucilaginous when soaked in water. Native to this country.
=Jimson Weed. Thorn-apple.= _Datura Stramonium_ L. Pods ovoid, densely prickly, about 4 cm. long; seeds black to brown, flattened, with 6-10 slight irregular elevations, the whole surface covered with minute shallow pits, short kidney shaped, i. e., one edge nearly straight or slightly notched, the remainder of the margin making about two-thirds of a circle. 3-3.5 mm. long. Most likely introduced from Asia. A coarse, poisonous weed found in waste places.
=Purple Jimson Weed. Purple Thorn-apple.= _Datura Tatula._ The color of the stems are purple, the flowers and pods nearly the same as those last above; seeds of the two scarcely if at all unlike. Naturalized from tropical America. Waste places.
=Horse Nettle.= _Solanum Carolinense_ L. Berry orange-yellow, 1.6 to 2 cm. in diameter; seeds lemon yellow, slightly double convex, obovate 2.1-2.9 mm. long, surface finely granular all over. Native of the southwest U. S. It spreads rapidly by long roots.
=Black Nightshade.= _Solanum nigrum_ L. Berry black, smooth, globose, 8-10 mm. in diameter; seeds finely granular, dull, yellowish to light brown, flattened, unsymmetrically ovate, about 1.5 mm. long. Native to this country. I have the best of authority for saying that these berries when ripe make good pies, whether the uncooked fruit is poisonous there is less proof. Of little importance.
=Beaked Nightshade.= _Solanum rostratum_ Dunal. Fruit surrounded by a persistent prickly calyx about 2 cm. long; seeds flattened, irregularly undulate or wrinkled, dark brown or black, usually ovate or circular in outline, 2-2.5 mm. in diameter, surface covered with small pits. Introduced into Michigan from the southwest. A coarse prickly weed.
=Butter and Eggs. Toad-Flax.= _Linaria vulgaris_ Hill. _Linaria Linaria_ (L.) Karst. Flowers yellow and orange; seeds dark brown or black, flat, circular or oval, surrounded by a broad wing-margin, the wing notched and covered by numerous fine radiating ridges, the surface of the seed roughened by numerous projecting points, seed, including its wing, 1.5-2 mm. long. Introduced from Europe. A vigorous weed in meadows, spreading by seeds and by root stocks.