; seeds brown,
flattened, 3.5-4 mm. long, ovoid excepting a piece cut from one side of
the smaller end with 3-4 curved rows of minute slender objects on each
side, the raphe extending from the pointed end to the notch on one side
(half anatropous). Naturalized from northern Asia.

[Illustration: Fig. 129.]

=Bladder Ketmia.= _Hibiscus Trionum_ L. Seed brown, the surface dotted
with numerous, ragged, light-colored pimples. Think of the shape as
obovoid, and then bent somewhat to the side. As now found the seed is
triangular in outline with rounded corners, considerably thinned toward
one corner near which is the seed scar in the midst of a depression.
Each side of the triangle is about 2 mm. long. Introduced from Europe.
Not yet a prominent weed in Michigan.

[Illustration: Fig. 130.]

=Cheeses. Running Mallow.= _Malva rotundifolia_ L. Flowers white;
cluster of 12-15 fruits flattened, circular with depression on each
side, ovary circular, wedge-shaped, very slightly roughened, with
radiating ridges; seeds light brown, nearly smooth, flattened, 1.4-1.7
mm. in diameter, wedge shaped, nearly circular with a small notch on the
thin edge. Naturalized from Europe.

[Illustration: Fig. 131.]

=Whorled Mallow.= _Malva verticillata._ L. Flowers white; cluster of
10-12 fruits flattened, circular with depression on each side, carpel
circular, wedge-shaped, about three rows of irregular shallow pits on
the wide edge, radiating ridges on each flat side; seeds light brown,
nearly smooth, flattened, wedge-shaped, ovate or nearly circular,
1.5-1.7 mm. long, with a small notch on the thin edge. Introduced from
the west.

[Illustration: Fig. 132.]

=Prickly Sida.= _Sida spinosa_ L. Seed smooth, dull brown or reddish
brown, having one side round and two sides flat or more or less concave,
all edges obtuse while lying on one flat side, broadly ovoid, with one
side nearly straight, scar at the larger end in the midst of a slight
depression, 1.5-1.8 mm. long. Not yet common in Michigan. Introduced
from the tropics.

ST. JOHN'S-WORT FAMILY. HYPERICACEAE.

[Illustration: Fig. 133.]

=Common St. John's-wort.= _Hypericum perforatum_ L. Seed dark brown,
mottled with about twenty-four vertical rows of small scars, short
oblong, 1 mm. long, a little more or less, circular in cross-section, a
slight point at one or both ends. Troublesome in old meadows and
pastures. From Europe.

EVENING-PRIMROSE FAMILY. ONAGRACEAE.

[Illustrat