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Term	Definition
Keystone species	A species that plays a role in the survival of other species, such as by providing a source of food; e.g., species of Ficus (Moraceae).
Labellum	Same as lip.
Labelo	Ver labio.
Labiate	Lipped; i.e., referring to plant parts that are shapped like lips; of or pertaining to the Lamiaceae (mint family).
Labio	En las Orchidaceae es el pétalo del medio. Este usualmente está altamente modificado y es diferente a los dos pétalos laterales restantes. El labio de las orquídeas usualmente juega un papel importante en la polinización; también es una de las dos partes de una corola bilabiada, por ejemplo, en las Lamiaceae.
Lacerate	Torn, irregularly cut or divided, usually referring to the margin of a structure.
Laciniate	Cut into narrow divisions.
Lageniform	Gourd-shaped.
Lamellate	Made up of small, thin plates.
Lámina	Porción generalmente expandida y aplanada de una hoja.
Lamina	The expanded portion of a leaf or other structure such as a petal; when it is a leaf the narrowed part is the petiole and when it is a petal the narrowed part is the claw. Same as blade.
Laminar	Expanded into a flattened or bladelike structure.
Laminar placentation	A type of parietal placentation in which the ovules arise along the surface (rather than the margins) of the carpels. Compare with marginal placentation; see placentation.
Laminariform	Bladelike.
Laminate (laminated)	Arranged in layers, e.g., the outer bark of Lecythis pisonis..
Lanate	Woolly, usually referring to a type of pubescence.
Lanceoid	Referring to a three-dimensional structure that is lance-shaped when viewed from the side (wider at the base than at the middle).
Lanceolada	Se refiere a la forma de una lámina de una hoja u otra estructura similar, cuando es más ancha en la base, sus márgenes son convergentes y cuya relación longitud/ancho es 3:1 o mayor
Lanceolate	Lanceolate 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 3:1 or more.
Lanuginose	Woolly or cottony, referring to a type of pubescence.
Large Trees Score	0-10 scale of the % of mature trees at the site, and % of those alive
Lateral aril	An aril that runs along the side of the seed such as in many, but not all, species of Eschweilera (Lecythidaceae).
Lateral bud	A bud arising in the axil of a leaf. Same as axillary bud.
Lateral leaflet	In a pinnately compound leaf, the leaflets at inserted along the rachis. Note that pinnately compound leaves with lateral leaflets can be either imparipinnate ( = odd pinnate) or paripinnate (= even pinnate) depending on if there is a terminal or there is not a terminal leaflet, respectively.
Lateral style	Referring to a gynobasic style that arises from the base and side of the ovary.
Lateral vein	Same as secondary vein.
Látex	Exudado blanco, cremoso o amarillo que usualmente emana a través de alguna herida en las plantas. Las especies de Clusiaceae usualmente emanan látex cuando son cortadas
Latex	Opaque, white, creamy, or yellow, free-flowing exudate, usually observed from a wound in a plant; species of Clusiaceae usually exude latex when wounded.
Laticifer	A latex-producing cell or series of cells.
Latrorse	Directed toward the side, as the dehiscence of an anther; same as lateral. Compare with extrorse and introrse.
Latticed	Cross-barred; e.g., the trunks of Swartzia polyphylla (Fabaceae), which are sulcate with connections between the ridges.
Lax	Loose, not congested, often used to describe the density of flowers in an inflorescence.
Leaf	An expanded stucture where photosynthesis takes place and usually consisiting of a petiole and a blade.
Leaf	A green, expanded stucture usually consisiting of a petiole and a blade but sometimes without a petiole in which photosynthesis takes place. When a petiole is absent the leaf is called sessile.
Leaf apex acuminate	Gradually tapering to an acute apex with the sides being concave.
Leaf apex acute	Sharp; usually referring to the apex of a flattened structure (such as a leaf) in which the two sides are straight and, when they meet, form an angle that is always less than 90°
Leaf apex attenuate	Tapering very gradually to a narrow tip.
Leaf apex emarginate	Markedly notched, such as the apex of a leaf or other structure.
Leaf apex mucronate	A sharp point at the apex of a leaf or a similar structure, e.g., a bract.
Leaf apex obtuse	Blunt, usually referring to the apex of a flattened structure (such as a leaf) in which the two sides are straight and, when they meet, form an angle greater than 90°.
Leaf apex retuse	Notched slightly at the apex.
Leaf apex rounded	Referring to a leaf blade base that is curved at the apex with an angle greater than 90 degrees at the point where the two sides meet.
Leaf apex truncate	Referring to an apex or base that terminates abruptly in a nearly straight horizontal edge.
Leaf asymmetrical	Referring to the form of a leaf in relation to the midrib, if the blade on each side of the midrib is unequal the leaf is asymmetrical.
Leaf base acute	Sharp; referring to the base of a leaf blade in which the two sides are straight and, when they meet, form an angle that is always less than 90°.
Leaf base asymmetric	Referring to a leaf base in which the two sides do not attach to the petiole at the same place, one is attached than the other.
Leaf base cordate	Heart-shaped at the base of a leaf blade. A cordate leaf blade always has a cordate base but a cordate leaf base may not always be associated with a cordate leaf blade.
Leaf base cuneate	Wedge-shaped; referring to the base of a leaf blade of which the angle formed by the meeting of the margins is less than 90°.
Leaf base decurrent	Referring to a leaf blade base that extends down the petiole.
Leaf base lobate (lobed)	A rounded projection arising from the base of a leaf blade.

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