Redroot \Red"root`\ (r?d"r?t`), n. (Bot.) A name of several plants having red roots, as the New Jersey tea (see under Tea), the gromwell, the bloodroot, and the Lachnanthes tinctoria, an endogenous plant found in sandy swamps from Rhode Island to Florida.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Bloodroot \Blood"root`\, n. (Bot.) A plant (Sanguinaria Canadensis), with a red root and red sap, and bearing a pretty, white flower in early spring; -- called also puccoon, redroot, bloodwort, tetterwort, turmeric, and Indian paint. It has acrid emetic properties, and the rootstock is used as a stimulant expectorant. See Sanguinaria.

Note: In England the name is given to the tormentil, once used as a remedy for dysentery.

Source: Webster's Revised Unabridged Dictionary (1913)