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).
Inflorescence: The basic definition for this term is: group of two or more flowers on the same stalk or peduncle. An inflorescence can vary greatly in format, from the long spike, like the Gladioli, to the larger and rounder, like hydrangea. (Also see raceme, panicle, spike and umbel.)
