described. When in
flower, two of the upper internodes are glutinous. Only found on thin
soil.

[Illustration: Fig. 67.]

=Forked Catch-fly.= _Silene dichotoma_ Ehrh. Seeds reddish-brown,
flattened, the three sides and the corners rounded, thickest at one
corner narrowing to the side opposite; seed scar in the middle of the
narrow side, four curved rows of tubercles on either side of the seed
extending to the scar, diameter 1.3 mm., the thick edge concave,
containing 6-7 rows of tubercles.

[Illustration: Fig. 68.]

=Bladder Campion.= _Silene latifolia_ (Mill.) Britton & Randle. _Silene_
(Moench) Garcke. Flowers white; pod covered by an inflated calyx, seeds
dull grayish brown, flattened, wedge-shaped, oval or 3-sided, 1-1.7 mm.
across, 5-7 curved rows or tubercles on each side. Naturalized from
Europe.

[Illustration: Fig. 69.]

=Night-flowering Catch-Fly.= _Silene noctiflora_ L. Flowers white; seeds
dull grayish brown, very slightly flattened, oval or short
kidney-shaped, nearly 1.5 mm. across, with 8-10 curved rows of tubercles
on each side. Naturalized from Europe.

[Illustration: Fig. 70.]

=Spurry.= _Spergula arvensis_ L. Flowers white; seeds jet-black, except
a narrowly winged, light-colored margin, slightly flattened, circular in
outline 1-1.5 mm. across, with a slight notch on one side, surface often
sprinkled with delicate, fragile, light-colored prickles. Introduced
from Europe. Thriving on poor, sandy land.

[Illustration: Fig. 71.]

=Common Chickweed.= _Stellaria media_ (L.) Cyrill. _Alsine media_ L.
Flowers white; seeds reddish yellow to dark brown, somewhat flattened,
nearly circular, each side covered with 5-6 curved rows of tubercles,
giving the appearance of having the two extremities bent together, about
1 mm. in diameter. Introduced from Europe, thriving in cool weather in
shade.

PURSLANE FAMILY. PORTULACACEAE.

[Illustration: Fig. 72.]

=Purslane. Pussley.= _Portulaca oleracea_ L. Flowers yellow, seeds
jet-black, shining, flattened, wedge-shaped, having three rounded nearly
equal sides, broadly oval or almost circular, often having a curved
tooth or point on one side, with 3-4 curved rows of minute tubercles.
Seed .5-.8 mm. in diameter. Naturalized from the southwest. Every
gardener knows how difficult it is to exterminate this weed.

CROWFOOT FAMILY. RANUNCULACEAE.

[Illustration: Fig. 73.]

=Small-flowered Crowfoot.= _Ranunculus abortivus_ L. Achene light brown
to stra