Boehmeria cylindrica, with common names false nettle and bog hemp, is an herb in the family Urticaceae. It is widespread in eastern North America and the Great Plains from New Brunswick to Florida to Texas to Nebraska, with scattered reports of isolated populations in New Mexico, Arizona, and Utah, as well as in Bermuda, Mexico, Central America, the West Indies, and South America.

The plant is an herb or subshrub up to 160 cm (63 in) tall, usually monoecious, but rarely dioecious. Leaves are usually opposite, though occasionally alternate, and the inflorescence is a spike with a tuft of small bracts at the apex.

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