What is "galeopsis tetrahit"

Hemp \Hemp\ (h[e^]mp), n. [OE. hemp, AS. henep, h[ae]nep; akin to D. hennep, OHG. hanaf, G. hanf, Icel. hampr, Dan. hamp, Sw. hampa, L. cannabis, cannabum, Gr. ka`nnabis, ka`nnabos; cf. Russ. konoplia, Skr. [,c]a[.n]a; all prob. borrowed from some other language at an early time. Cf. Cannabine, Canvas.]

1. (Bot.) A plant of the genus Cannabis ( Cannabis sativa), the fibrous skin or bark of which is used for making cloth and cordage. The name is also applied to various other plants yielding fiber.

2. The fiber of the skin or rind of the plant, prepared for spinning. The name has also been extended to various fibers resembling the true hemp.

   African hemp, Bowstring hemp. See under African, and Bowstring.

   Bastard hemp, the Asiatic herb Datisca cannabina.

   Canada hemp, a species of dogbane ( Apocynum cannabinum), the fiber of which was used by the Indians.

   Hemp agrimony, a coarse, composite herb of Europe ( Eupatorium cannabinum), much like the American boneset.

   Hemp nettle, a plant of the genus Galeopsis ( Galeopsis Tetrahit), belonging to the Mint family.

   Indian hemp. See under Indian, a.

   Manila hemp, the fiber of Musa textilis.

   Sisal hemp, the fiber of Agave sisalana, of Mexico and Yucatan.

   Sunn hemp, a fiber obtained from a leguminous plant ( Crotalaria juncea).

   Water hemp, an annual American weed ( Acnida cannabina), related to the amaranth.

Galeopsis tetrahit (common hemp-nettle or brittlestem hempnettle) is a flowering plant in the family Lamiaceae, native to Europe and northwestern Asia.

It is a herbaceous annual plant growing to 1 m tall; it is a pioneer species and thrives on disturbed sites or roadsides. The plant looks like mint but is taller. The stems have reflexed hairs and swollen nodes. In cross section, the stem is square. The leaves are rhombic to elliptic, with coarsely to bluntly serrate edges. The flowers are multicoloured, with purple, pink, or white areas; diminutive, bilateral and snapdragon-like, and are mostly visited by bumblebees.

The species is considered by some authorities to have arisen as a natural hybrid between Galeopsis pubescens and Galeopsis speciosa.