Michx. Seeds ash colored, obovoid,
or globose, inconspicuously four-angled, base obtuse, irregularly
tuberculate, 1 mm. or more long. It thrives in the Botanic Garden and
very likely may soon spread onto Michigan farms.

[Illustration: Fig. 122.]

=Leafy Spurge.= _Euphorbia Esula_ L. Seeds dull, light drab colored,
broad-oval, narrowed at one end, nearly circular in transverse section,
2.3 mm. long, not including a wrinkled bunch (caruncle) at the base, a
dark vertical line (raphe) extending above one side opposite which is
another ridge the color of the seed. Introduced from Europe.

[Illustration: Fig. 123.]

_Euphorbia hirsuta_ (Torr). Weigand. Seeds lead colored, obovoid
approximately square in transverse section with one side narrower than
the others, 4-10 irregular transverse ridges on each side, the raphe
standing along one corner, about 1.2 mm. long by 7 mm. wide. Sandy soil.

[Illustration: Fig. 124.]

=Spotted Spurge.= _Euphorbia maculata_ L. Seeds obovoid-oblong, nearly
square in cross-sections, minutely pitted and transversely wrinkled with
2-5 broken wavy ridges, a fine dark vertical line (raphe) along one
corner, color reddish drab, .6-.8 mm. long. Probably introduced from
west of the Rocky Mountains.

[Illustration: Fig. 125.]

=Upright Spotted Spurge.= _Euphorbia Preslii_ Guss. _Euphorbia nutans
Lag._ Seeds lead-colored obovoid-oblong, with 4 unequal sides as seen in
cross-section, pitted and transversely wrinkled, with 2-5 broken wavy
ridges, a fine dark, verticle line (raphe) along one corner, 1-1.3 mm.
long. Native of eastern North America. Introduced in seeds of red
clover.

[Illustration: Fig. 126.]

=Thyme-leaved Spurge.= _Euphorbia serpyllifolia_ Pers. Seed ash-colored,
obovoid, four-angled or nearly square in cross-section, the surface
covered with four or five more or less broken obtuse transverse ridges,
a slender, dark line (raphe) extending from end to end on one corner.
Dry soils, like railway tracks.

CASHEW FAMILY. ANACARDIACEAE.

[Illustration: Fig. 127.]

=Poison Ivy.= _Rhus Toxicodendron_ L. Berry nearly white, globular,
about 5 mm. in diameter, drupe kidney-shaped, concave on both edges, 3
by 4.5 mm. in diameter, 2 mm. thick. To some people very poisonous to
the touch; a woody shrub.

MALLOW FAMILY. MALVACEAE.

[Illustration: Fig. 128.]

=Indian Mallow. American Jute. Velvet Leaf.= _Abutilon Theophrasti_
Medic. _Abutilon Abutilon_ (L.) _Rusby_. Flowers yellow