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).
Germination: The first developmental stage of a seed within a plant. The visible sign of germination is the appearance of a plantule or seedling. Germination can be fast (4 to 6 days) or slow (several weeks or even months). It is a delicate stage, for the seed is no longer protected by the seed coat and strong roots and leaves have not yet developed.
