Definition

Noun: 1. A taxonomic genus of flowering plants: "Genus Rubia" is the type genus of the family Rubiaceae. It comprises Old World herbs and subshrubs historically cultivated for their medicinal properties and for the dye substances extracted from their roots.

Examples of Usage

• Noun:
  • The madder dye, a historically important red colorant, is derived from plants in the genus Rubia.
  • Botanists are studying the phylogenetic relationships within the genus Rubia.
  • Several species of genus Rubia have been used in traditional medicine for centuries.

Advanced Usage

• In botanical nomenclature: The name is always capitalized ("Genus " or simply "") and is often italicized in scientific writing to denote it as a genus name.
  • The research paper focused on the alkaloid content of Rubia tinctorum.

Variants and Related Words

• Rubia (n): The standard, abbreviated form used to refer to the genus.
  • The plant specimen was keyed out as belonging to Rubia.
• Rubiaceae (n): The plant family (the madder or coffee family) to which the genus belongs.
  • Rubia is the type genus for the large and economically important family Rubiaceae.

Synonyms

• Madder genus: A common name reference, though this can sometimes colloquially refer to the specific species (common madder) rather than the entire genus.

Related Terms and Phrases

• Madder: The common name for plants in this genus, especially , and for the red dye (alizarin) obtained from their roots.
  • Artists' pigments made from madder were highly prized before synthetic dyes.
• Alizarin: The principal red dye compound historically extracted from the roots of species.
  • The chemical structure of alizarin was first determined in the 19th century.

Noun

1. type genus of the Rubiaceae; Old World herbs and subshrubs grown for their medicinal properties and for dye substances extracted from their roots