Australian Biological Resources Study
Compiled by A.McCusker
umbel: a racemose inflorescence in which all the individual flower stalks arise in a cluster at the top of the peduncle and are of about equal length. > image <
umbellule: secondary umbel in a compound umbellate inflorescence.
uncinate: terminating in a hooked point.
undulate: wavy, i.e. not flat. cf. sinuate. > image <
unifacial: of leaves, where the adaxial (upper) edge is homologous with the adaxial surface of a dorsiventral leaf and the remainder is derived from the abaxial surface. cf. bifacial.
unifoliate: having one leaf.
unifoliolate: of a leaf, basically compound, but reduced to only one leaflet. > image <
unilateral: of stamens, with anthers grouped on one side of the style.
unilocular: of an ovary, anther or fruit, having only one internal cavity.
unisexual: bearing only male or only female reproductive organs. > image <
united: fused together.
urceolate: urn-shaped. > image <
utricle: a small bladder; a membranous bladder-like sac enclosing an ovary or fruit.