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A tall composite plant of the genus Eupatorium (E. purpureum), with purplish flowers, and whorled leaves.

A slender, nearly leafless, American herb (Polygonum articulatum), with jointed spikes of small flowers.

taury (Centaurea nigra); -- so called from the knoblike heads of flowers. Called also bullweed.

Same as Knapweed.

See Knot.

The water pepper (Polygonum Hydropiper), an aquatic plant of Europe and North America.

A name of several maritime grasses, as the sea sand-reed (Ammophila arundinacea) which is used in Holland to bind the sand of the seacoast dikes (see Beach grass, under Beach); also, the Lygeum Spartum, a Mediterranean grass of similar habit.

A composite plant (Anthemis Cotula), having a strong odor; dog's fennel. It is a native of Europe, now common by the roadsides in the United States.

rates, abounding in a milky juice, and having its seed attached to a long silky down; silkweed. The name is also applied to several other plants with a milky juice, as to several kinds of spurge.

A slender European weed (Galium Cruciata); -- called also crossweed.

An American annual weed (veronica peregrina), with small white flowers and a roundish pod.

A foul-smelling weed, the stinking goosefoot (Chenopodium Vulvaria).

Any large seaweed of the genus Laminaria; tangle; kelp. See Kelp.

The lichen from which archil is obtained. See Archil.

Same as Oarweed.

To weed out. [Obs.]

A name of several annual weeds. See Goosefoot, and Lamb's- quarters.

A low, bushy, nearly leafless herb (Hypericum Sarothra), common in sandy soil in the Eastern United States.

Any plant of the genus Lechea, low North American herbs with branching stems, and very small and abundant leaves and flowers.

See Poke, the plant.