Type of inflorescence in which all pedicles (floral stalks) eradiate from a common point. E.g., geranium, gardenia. One can also say the umbel is a raceme whose axis did not elongate: the younger flowers are in the center and the older gradually distal. (Also see Raceme, Inflorescence).
Undulated
Leaf or petal with wavy margin. The term is not applied to serrated or toothed margins.
Unisexual
Monoecious or Dioecious plants in which the flower are male or female; flower that is not hermaphroditic, but is either male or female. (compare with Hermaphrodite).
Species: Group of plants that resemble each other. In biology, a species is designated by a binomial of the genus name (in uppercase) followed by the species name (usually in lower case), and both terms are always in Latin or Latinized. E.g., Coleus (genus) blumei (species). A genus is a group of species.
