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us Potamogeton, of which many species are found in ponds or slow-moving rivers. Choke pondweed, an American water weed (Anarcharis, or Elodea, Canadensis.) See Anacharis. -- Horned pondweed, the Zannichellia palustris, a slender, branching aquatic plant, having pointed nutlets.

A common American composite weed (Ambrosia artemisiæfolia) with finely divided leaves; hogweed. Great ragweed, a coarse American herb (Ambrosia trifida), with rough three-lobed opposite leaves.

Any plant of the genus Astragalus. See Milk vetch.

The red poppy (Papaver Rhoeas). Dr. Prior.

pumila) of the Nettle family, having a smooth, juicy, pellucid stem; -- called also clearweed.

Any coarse seaweed growing on sea-washed rocks, especially Fucus.

The compass plant. See under Compass.

Cleavers.

A fleshy plant (Arenaria peploides) growing in large tufts in the sands of the northern Atlantic seacoast; -- called also sea sandwort, and sea purslane.

Popularly, any plant or plants growing in the sea.

t of the genera Asclepias and Acerates whose seed vessels contain a long, silky down; milkweed.

A perennial rosaceous herb (Potentilla Anserina) having the leaves silvery white beneath.

Skunk cabbage.

An acrid plant of the genus Polygonum (P. Hydropiper), which produces smarting if applied where the skin is tender.

A kind of knotweed (Polygonum Bistorta).

See Impatiens.

A yellow-flowered composite plant (Helenium autumnale) the odor of which is said to cause sneezing.

The golden ragwort. See under Ragwort.

Stramonium. See Jamestown weed, and Datura.

Any plant of the genus Lithospermum, herbs having a fruit composed of four stony nutlets.