Althaea cannabina Althaea cannabina Althaea cannabina, commonly called palm-leaf marshmallow or hemp-leaved hollyhock, is a perennial herb belonging to the genus "Althaea" of the Malvaceae family. The leaves resemble those of hemp ("Cannabis sativa"), hence the specific epithet "cannabina" ("hemp-like"). "Althaea cannabina" reaches on average of height. The stem is erect, cylindrical, pubescent and very branched. Lower leaves are petiolate, hairy and almost completely subdivided in three-five segments, linear or linear-lanceolate, toothed or lobed, up to wide and long. The upper leaves are simply lobed and toothed. The flowers are solitary or in clusters and grow in the axils of the leaves,
Melilotus officinalis capacity in poor soils. Sweet clover is a major source of nectar for domestic honey bees as hives near sweetclover can yield up to 200 pounds of honey in a year. Sweetclover has been used as a phytoremediation—phytodegradation plant for treatment of soils contaminated with dioxins. In the chemical industry, dicoumarol is extracted from the plant to produce rodenticides. When "M. officinalis" is invasive, it can be managed by mulching, hand-pulling, mowing, or herbicide applications such (e.g., 2,4-D) before flowering. Prescribed burns in late fall or early spring followed by another burn in late spring can reduce the number of