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valvate - adj. (NL. valvatus, fr. L., having
folding doors) meeting at the edges without
overlapping; opening as if by doors or
valves.
vascular bundle - a group of specialized cells consisting of xylem and phloem, sometimes separated by a strip of cambium and arranged in different patterns. vascular cambium - lateral meristem that forms the secondary tissue and is located between the xylem and phloem. variety - n. (L. varietas, variety) a taxonomic group below the species used in different senses by different specialists, including a race, stock, strain, breed, subspecies, geographical race, or mutant. velamen - n. (L. velamen, covering) a membrane; water-storing tissue in the outer layer of some roots. vernal - a. (L. vernalis, of the spring) belonging to the spring; appearing or occurring in spring; of the spring season. verrucose - a (L. verrucosus, full of warts, warty) warty; having little warts or wartlike growth on the surface. verticil - n. (L. verticillus, whorl) an arrangement of leaves, flowers, inflorescences, or other structures which surround the stem in a circle upon the same plane about the same point on the axis. verticillate - a. (L. verticillus, whorl) growing in a whorl or arranged on the same plane around an axis, as flowers, leaves, branches, etc.; arranged in verticils, whorled. versatile - a. (L. versatillis, turning around) turning freely on its support, as an anther attached near the middle and capable of swinging freely on the filament. vesicle - a. (L. vesicula, bladder) any small bladderlike structure, cavity, sac, or cyst; a small bladderlike sac filled with air. vestiture - n. (L. vestitus, grament) that which covers a surface, as hairs, scales, etc. villous - n. (L. villosus, hairy) pubescent; shaggy; covered with fine long hairs, but the hairs not matted. viscid - a. (L. viscum, bird lime) thick, sirupy, and sticky, viscous; covered with a viscid substance as of leaves. viviparous - a. (L. vivus, alive; parere, to produce) producing young alive rather than in eggs, as in most mammals; multiplying by vegetative means such as buds or bulbils in the position of flowers.
wet weight - same as fresh weight; weight of plants after the outer surface covering of water has been removed. Wet weight is not a reliable measurement since methods to prepare plants prior to weighing vary considerably. wet woodland - a wooded area having surface water some of the time, for intermittent short periods. whorl - n. (AS. hweorfan, to turn) circle of flowers, parts of a flower, or leaves arising from one point; verticil. whorled - a., when three or more leaves are arranged at the same level on a stem, typical of such plants as hydrilla. woody - a. (ME. woddy, wody, fr. wode, wood + -y) of or containing wood or wood fibers; consisting mainly of hard lignified tissues.
xeric - a. (Gr. xeros, dry) characterized by a scanty supply of moisture, tolerating, or adapted to, arid conditions. xylem - n. (Gr. xylon, wood) woody tissue that is part of the water-transporting system in plants, consisting of lignified tracheids or vessels, and which also acts as a supporting tissue.
yield - n. (AS. glidan, to pay, restore, give up) standing crop expressed as a rate, i.e., g dry weight per meter square per day.
zygomorphic - a. (Gr. zygon, yoke; morphe, shape) said of the corolla or calyx when divisible into equal halves in one plane only bilaterally symmetrical, with only one plane of symmetry. |