wo laterally placed cavities near the base, each
filled with white spongey tissue, broadly oval, slightly flattened,
1.3-1.7 mm. long. Introduced from Europe. Scarcely a weed.

[Illustration: Fig. 159.]

=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.

NIGHT SHADE FAMILY. SOLANACEAE.

[Illustration: Fig. 160.]

=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.

[Illustration: Fig. 161.]

=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.

[Illustration: Fig. 162.]

=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.

[Illustration: Fig. 163.]

=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.

[Illustration: Fig. 164.]

=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