Displaying 726 - 750 out of 1575 Object(s)

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). Keystone species
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. Lamina
Laminate (laminated) Arranged in layers, e.g., the outer bark of Lecythis pisonis.. Laminate (laminated)
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. Lanceolate
Lateral aril An aril that runs along the side of the seed such as in many, but not all, species of Eschweilera (Lecythidaceae). Lateral aril
Lateral bud A bud arising in the axil of a leaf. Same as axillary bud. Lateral 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 leaflet
Lateral style Referring to a gynobasic style that arises from the base and side of the ovary. Lateral style
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 Látex
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. Latex
Latrorse Directed toward the side, as the dehiscence of an anther; same as lateral. Compare with extrorse and introrse. Latrorse
Leaf An expanded stucture where photosynthesis takes place and usually consisiting of a petiole and a blade. Leaf
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
Leaf apex acuminate Gradually tapering to an acute apex with the sides being concave. Leaf apex acuminate
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 acute
Leaf apex attenuate Tapering very gradually to a narrow tip. Leaf apex attenuate
Leaf apex emarginate Markedly notched, such as the apex of a leaf or other structure. Leaf apex emarginate
Leaf apex mucronate A sharp point at the apex of a leaf or a similar structure, e.g., a bract. Leaf apex mucronate
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 obtuse
Leaf apex retuse Notched slightly at the apex. Leaf apex retuse
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 rounded
Leaf apex truncate Referring to an apex or base that terminates abruptly in a nearly straight horizontal edge. Leaf apex truncate
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 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 acute
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 asymmetric