A cluster of leaves or other plant parts arranged in a circle, often at the base.

Bedstraw or Madder Family. Comprised of 611 genera and more than 13,150 species of herbs, shrubs, and trees. Several species are of economic important as sources of useful chemicals and many are cultivated as ornamentals. Members of this family usually have many small flowers in dense clustered heads, leaves opposite or in whorls, stipules and an inferior ovary.

A long, creeping stem, that roots at its tips and nodes.