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Term	Definition
Trisect	Divided into three parts.
Tristichous	Three-ranked or in three rows. Compare with distichous and polystichous.
Tristyly (tristylous)	The condition in which three different style lengths and corresponding stamen lengths are found in the same species, the flower morphs are short styled, intermediate styled, and long styled.
Tronco	Tallo principal de un árbol
Tropics	Referring to that part of the earth ibetween the Tropic of Cancer at 23 degrees 27 minutes N and the Tropic of Capricorn at 23 degress 27 minutes S. These are the northern and southern latitudes at which the sun can be directly overhead at some time during the year.
Trullate	Trowel-shaped.
Truncate	Referring to an apex or base of a two dimensional structure, such as a leaf, bract, or petal, that terminates abruptly in a nearly straight horizontal edge.
Truncate fruit base	An ovary or a fruit which abruptly turns inward from the calycine rim to the pedicel/hypanthium. Same as infracalycine zone truncate.
Trunk	The main stem of a tree, including buttresses, prop roots, etc. Compare with bole.
Trunk	In trees, the unbranched portion of the plane, i.e., the first order of branching. Same as bole.
Trunk buttressed	An outgrowth at the base of a tree trunk that does not completely surround the tree.
Trunk cylindrical	A trunk that is in the form of a cylinder all of the way to the ground.
Trunk swollen	A trunk that is expanded all around the base without forming distinct buttresses.
Tube	A chamber formed by the fusion of separate parts; e.g., the corolla tube or the tube of the spathe in Araceae.
Tuber	An underground, swollen part of a stem or a root that functions in food storage.
Tubercle	The modified and persistent style base of some Cyperaceae.
Tuberculate	Covered with pointed warty outgrowths; e.g., the fruit of Canna indica (Cannaceae).
Tuberculate hypanthium	Refers to a hypanthiuim covered with warty, pointed outgrowths.
Tubo corolino	Es la parte inferior de una corola gamopétala, donde los pétalos están fusionados
Tubo de la corola	Es la parte baja fusionada de una flor gamopétala.
Tubo del cáliz	Parte baja fusionada de un cáliz gamosépalo. En las Ericaceae con ovarios inferiores, es la porción proximal del cáliz que está fusionado con la pared del ovario que es lo mismo que el hipantio en otras plantas con flores.
Tunic (tunicate)	The outer, dry and papery covering of a bulb or corm (possessing a tunic).
Turbinate	Obconical or top-shaped.
Turion	A bud or shoot characteristic of aquatic plants that enables them to overwinter.
Tussock	A dense clump or tuft of herbaceous stems formed by some species of grasses (Poaceae) and sedges (Cyperaceae).
Twig	A small branch of a tree to which the leaves are attached, i.e., the ultimate, leaf-bearing branch.
Twig	A branch of a tree of Lecythidaceae to which the leaves are attached, i.e., the ultimate, leaf-bearing branch.
Two-ranked	Referring to structures that are arranged in two rows; usually referring to the way in which leaves or bracts are inserted on an axis. Same as distichous.
Type	"A nomenclatural type (typus) is that element to which the name of a taxon is permanently attached, whether as the correct name or as a synonym. The nomenclatural type is not necessarily the most typical or representative element of a taxon." This quotation is from the International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code) 2018. The ICN (or Code) is updated every six years based on proposals approved at the International Botanical Congress which meets at different places in the world. The latest Code is available online here: https://www.iapt-taxon.org/nomen/main.php
Type specimen	A specimen chosen to represent a species and is cited as such in the publication in which the species is described. There are different types of types, e.g. see holotype, isotype, syntype. The International Code of Nomenclature for algae, fungi, and plants now requires that one specimen be designated as the holotype.
Umbel	A convex- or flat-topped inflorescence with all pedicels arising from the same point.
Umbela	Una inflorescencia distalmente convexa, cuyos pedicelos salen de un mismo punto de inserción. Las umbelas compuestas son típicas de las Apiaceae y algunas especies de Araliaceae y Smilacaceae
Umbell	A convex- or flat-topped inflorescence with all pedicels arising from the same point.
Umbellate	Like an umbel.
Umbo	A relatively small protrusion usually in the middle of a structure; e.g., the operculum of a fruit.
Umbonate	Referring to a structure, such as a fruit apex, that possesses an umbo.
Uña	Es la parte baja, delgada y alargada de un pétalo libre. Por ejemplo, en las Malpighiaceae, algunas leguminosas y Lagerstroemia speciosa de Lythraceae. Ver unguiculado.
Unbranched inflorescence	An inflorescence with a single rachis.
Uncinate	Hooked at the apex.
Uncinate	Hooked at the apex, usually refers to stiff trichomes that stick in the fur or clothing of animals to facilitate seed dispersal.
Understory Score	0-25 scale of the % understory complement present compared to an "ideal" state, and % of that understory modified or disturbed in some way
Understory tree	A tree growing in a hypothetical stratum in the forest consisting of the crowns of trees found below the canopy and usually less than 20–25 meters tall at maturity.
Understory tree	A species of tree in which adult individuals do not reach the more-or-less continuous canopy tree layer of a forest.
Undulate	Wavy, usually referring to the margin of a structure such as a leaf.
Undulation (adj. = undulate)	Wavy, usually referring to the margin of a structure such as a leaf.
Unguiculada, unguiculado	Se refiere va aquellos pétalos libres que están abruptamente adelgazados y algo alargados hacia la base, es decir, provistos de una uña. Lo mismo que uñado.
Unguiculate	Referring to a structure, such as a petal, the is abuptly constricted toward the base (having a claw). Same as clawed.
Uni-	A prefix meaning one.
Unicate collection	Referring to a collection number that is represented by a single herbarium specimen. Unicate collections are made when additional collections are not available, when a plant is rare and permission has been obtained to make a collection that does not adversely impact the population from which it is collected, or when a species is so well known that the only reason for collecting it is to document its presence in a specific locality. For more information about plant collecting see Tropical Plant Collecting: From the Field to the Internet. This book can be purchased at: http://tecceditora.com/ or Amazon.com.
Unifacial	Referring to a leaf with the same type of tissue on each side as observed in a transverse section.

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