ion: Fig. 134.]

=Small-flowered Gaura.= _Gaura parviflora_ Dougl. Achenes greenish
brown, at first glance, having the appearance of barley, linear, swollen
in the middle, more or less grooved or channeled, 6-8 mm. long.
Introduced from the South.

[Illustration: Fig. 135.]

=Common Evening-Primrose.= _Oenothera biennis_ L. _Onagra biennis_ (L.)
Scop. Flowers yellow; seeds reddish brown or darker, surface dull,
minutely ridged, very irregular in shape owing to crowding in the pod,
more or less pyramidal and four or five sided, the angles acute or with
a wing-like border, 1.-1.5 mm. long. Native to this country.

PARSLEY FAMILY. UMBELLIFERAE.

[Illustration: Fig. 136.]

=Water Hemlock.= =Mosquash Root.= =Beaver Poison.= _Cicuta maculata_ L.
Achenes, when young grow in couples joined by their flat sides, broadly
oval, somewhat flattened, a single one-half oval, 2.7-3.2 mm long, with
five corky yellowish white vertical stripes alternating with four brown
oil tubes, the flat side with two wide light corky stripes including two
brown oil tubes. The roots are very poisonous. Native to Michigan and
elsewhere. Moist or wet lands.

[Illustration: Fig. 137.]

=Poison Hemlock.= _Conium maculatum_ L. Flowers white, achenes growing
in pairs, light brown, oval, flat on one side, five ribs extending from
one end to the other, between them the surface abounds in minute
vertical projections, achene about 3.5 mm. long. Difficult to identify.
Introduced from Europe.

[Illustration: Fig. 138.]

=Wild Carrot.= _Daucus Carota_ L. Flowers white; achenes light brown,
striped with white, oval, flattened, bearing numerous frail spines
along the edges and in two rows lengthwise of one face, tips of spines
diverging, often hooked, about 3.5 mm. long not including the spines.
Introduced from Europe. This is the cultivated carrot escaped from
fields and gardens. A great pest in old meadows.

[Illustration: Fig. 139.]

=Wild Parsnip.= _Pastinaca sativa_ L. Flowers yellow; achenes growing in
pairs, 5-6 mm. long, with flat sides together, light brown, broad oval,
much flattened, surrounded by a narrow thin ridge, 9-curved shallow ribs
on one side. Introduced from Europe.

MILKWEED FAMILY. ASCLEPIADACEAE.

[Illustration: Fig. 140.]

=Common Milkweed.= _Asclepias Syriaca_ L. Pods 8-12 cm. long, covered
with soft spiny processes; seeds dull light brown, much flattened,
narrowly obovate, 6.5-8 mm. long, the small end truncate, surro