Madder \Mad"der\ (m[a^]d"d[~e]r), n. [OE. mader, AS. maedere; akin to Icel. ma[eth]ra.]

(Bot.) A plant of the genus Rubia (Rubia tinctorum). The root is much used in dyeing red, and formerly was used in medicine. It is cultivated in France and Holland. See Rubiaceous. [1913 Webster]

Note: Madder is sometimes used in forming pigments, as lakes, etc., which receive their names from their colors, such as madder yellow. [1913 Webster]

Field madder, an annual European weed (Sherardia arvensis) resembling madder.

Indian madder, the East Indian Rubia cordifolia, used in the East for dyeing; -- called also munjeet.

Wild madder, Rubia peregrina of Europe; also the Galium Mollugo, a kind of bedstraw. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

Bedstraw \Bed"straw`\, n.

1. Straw put into a bed. --Bacon. [1913 Webster]

2. (Bot.) A genus of slender herbs, usually with square stems, whorled leaves, and small white flowers. [1913 Webster]

Our Lady's bedstraw, which has yellow flowers, is Galium verum.

White bedstraw is Galium mollugo. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

Galium mollugo

Source: WordNet (r) 2.0
 

Madder \Mad"der\, n. [OE. mader, AS. m[ae]dere; akin to Icel. ma?ra.]

(Bot.) A plant of the Rubia (R. tinctorum). The root is much used in dyeing red, and formerly was used in medicine. It is cultivated in France and Holland. See Rubiaceous.

Note: Madder is sometimes used in forming pigments, as lakes, etc., which receive their names from their colors; as. madder yellow.

Field madder, an annual European weed (Sherardia arvensis) resembling madder.

Indian madder, the East Indian Rubia cordifolia, used in the East for dyeing; -- called also munjeet.

Wild madder, Rubia peregrina of Europe; also the Galium Mollugo, a kind of bedstraw.

Source: Webster's Revised Unabridged Dictionary (1913)