Australian Biological Resources Study
Compiled by A.McCusker
wallum: coastal vegetation on sandy acidic soils, in south-eastern Queensland.
whorl: a ring of leaves, bracts or floral parts borne at the same level on an axis. cf. cyclic, spiral. > image <
wing: a membranous expansion of a fruit or seed, which aids dispersal; a thin flange of tissue extended beyond the normal outline of a stem or petiole; a lateral petal of a flower in Fabaceae. > image <
xeromorph: a plant having structural features usually associated with plants of arid habitats (such as hard or succulent leaves) but not necessarily drought-tolerant. cf. scleromorph, xerophyte.
xerophyte: a drought-tolerant plant. cf. xeromorph.
xylem: the tissue, in a vascular plant, that conducts water and mineral salts from the roots to the leaves.
zygomorphic (= irregular): of a flower or calyx or corolla, bilaterally symmetrical, symmetrical about one plane only, usually the plane that bisects the flower vertically along the longitudinal axis. cf. actinomorphic, peloric.