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Term	Definition
Voucher	A herbarium specimen used to document the identification of a species of plant in floristic, monographic, anatomical, ecological, economic, medicinal, taxonomic, etc. studies. If a voucher does not document plant studies there is no way to confirm or reject the identifications of the species in the studies.
Water dispersal	Referring to diaspores that are carried away from the mother plant by water. Most water dispersed seed have corky seed coats. However, other species have seeds with arched cotyledons that surround air spaces that give the seeds bouyancy and others have entire fruits that fall into the water.
Weed	A plant that grows anywhere that a human does not want it to grow. Most of the time invasive plants are considered to be weeds.
Weediness Score	0-15 scale of weed-cover taking into account the % of high-threat weeds present
Whorled	Arising from an axis in groups of more than two at the same node; e.g., leaves from a stem or flowers from the rachis of an inflorescence. Same as verticillate. Compare with alternate and opposite.
Whorled leaves	Arising from an axis in groups of more than two leaves at the same node; e.g., leaves along a stem or flowers along a rachis. Same as verticillate. Compare with alternate and opposite.
Widely elliptic	A widely elliptic shape is widest at the middle and possesses a length to width ratio greater than 1.5:1 to less than 2:1. Based on Hickey (1973).
Widely oblong	Referring to a two dimensional shape in which the greatest width extends throughout a middle zone at least one-third the length of the blade (in this zone the margins are more-or-less parallel) and the length to width ratio is 1.5:1 to less than 2:1.
Widely obovate	Widely obovate refers to a leaf, sepal, petal, or other flat structure that is wider above the midpoint and has a length-to-width ratio of 1.2:1 to less than 2:1.
Widely ovate	Widely ovate refers to a leaf, sepal, petal, or other flat structure that is wider at the base than at the midpoint, tapers toward the apex, and has a length-to-width ratio of 1.2:1 to less than 1.5:1.
Wind dispersal	Referring to a type of seed dispersal in which the diaspores are carried away from the mother plant by the wind. The most common types of wind-dispersed plants are those with winged fruits and seeds and comose seeds. Same as anemochory.
Wind pollination	Pollination by the wind, i.e., the movement of pollen by the from the stamens of a flower to the stigma of another flower. This includes movement for the anther to the stigma of the same flower, from the anther to the stigma of another flower on the same plant, or from the anther of a flower on one plant to the stigma of a flower on another plant. Same as anemophily.
Wing	Either of the two lateral petals of a flower of Fabaceae; a thin, flattened outgrowth from stems, petioles, fruits, or seeds,in the latter definition a winged organ is the same as an alate organ.
Winged	With a thin, conspicuous ridge running down the length of a structure such as a stem, leaf rachis, ovary, or fruit. Same as alate.
Winged fruit	Referring to fruits that either have have wings along their length that do not aid in wind dispersal or to fruits that have well-developed wings that aid in wind dispersal. Note that both winged fruits and winged seeds aid in wind dispersal.
Winged seed	Referring to seeds with a wing-like extensions that surround the seed, are are two sides of the side, or extend from one end of the seed, all of which facilitate wind dispersal.
Witch’s broom	A type of fungal infection that causes the host to produce anomalous growth that bears a remote resemblance to a broom.
Within	When used to indicate position equals adaxial. Compare with within and adaxial.
Without	When used to indicate position equals abaxial. Compare with within and adaxial.
Wood cross section	An anatomical section that runs at right angles to the main axis of the stem or the trunk.
Wood radial section	A wood anatomical section that runs parallel to the rays.
Wood tangential section	A wood anatomical section that cuts across the rays of a block of wood or a stem.
Xenogamy (Xenogamous)	Referring to the fertilization of the ovules of a flower by pollen from a flower on a different plant. Compare with geitonogamous.
Xeric	Referring to dry habitats.
Xylem	The water-and mineral conducting tissue of plants, which (with age) loses this function and serves to support the plant,
Xylopodium (plural = xylopodia)	An underground, woody, storage organ derived from stems or roots and common in cerrado vegetation.
Zarcillo	Filamento espiral, propio de las plantas trepadoras, que ayuda a trepar; por ejemplo, en Bignoniaceae, Passifloraceae y Vitaceae
Zarcillo uña de gato	Zarcillo dividido en tres partes iguales que están conspicuamente recurvadas, dispuestas en la porción distal. Por ejemplo, en Macfadyena unguis-cati y Parabignonia steyermarkii (Bignoniaceae).
Zigomorfa	Cuando una estructura solamente puede ser dividida en dos partes iguales. Este término usualmente es aplicado a las flores. Zigomorfa es lo mismo que irregular y radialmente asimétrica (simetría radial). Es opuesto a actinomorfa.
Zygomorphic	A plant structure capable of being divided only into two equal parts. This term is most often used to refer to flowers.
Zygomorphic	Capable of being divided into only two equal parts; a structure in which a line drawn through the middle will produce a mirror image of one side of the line to the other side of the line.
Zygomorphic flower	A flower capable of being divided into only two equal parts (mirror images) by a line passing through the middle of a flower, i.e., other lines passing the middle of the flower will not give mirror images of one another; same as monosymmetric, bilaterally symmetrical, and irregular flowers and opposite of actinomorphic, monosymmetric, radially symmetrical, and regular flowers. This term can refer to other plant parts as well.
	Anthers that open (dehisce) and release pollen via a terminal or subterminal pore.

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