Displaying 1 - 60 out of 80 Object(s)
| Term | Definition | |
|---|---|---|
| Asymmetric leaf base | Referring to a leaf base in which the two sides do not attach to the petiole at the same place, i.e., one is attached to the petiole higher than the other is attached. |  |
| Compound leaf | Referring to a leaf which is divided into smaller units; i.e., leaflets. Opposite of simple. |  |
| Cotyledons foliaceous (= cotyledons leaf-like) | Cotyledons that look like leaves but differ in their opposite instead of alternate attachment. Same as cotyledons leaf-like which is the preferred term. |  |
| Cotyledons foliaceous (=cotyledons leaf-like) | Referring to cotyledons that are not carnose but instead are thin and leaf-like. In the Sapotaceae, species with foliaceous cotyledons generall have endosperm. |  |
| Cotyledons leaf-like | Cotyledons that look like leaves. |  |
| Cotyledons leaf-like (= cotyledons foliaceous) | Cotyledons that look like leaves but differ in their opposite instead of alternate attachment. | |
| Even-pinnate leaf | Pinnately compound leaf with an even number of leaflets; i.e., without a terminal leaflet. Same as parapinnate. |  |
| Flowering associated with leaf flush | A phenological strategy in which a tree drops its leaves, flowers when the canopy is leafless or partially leafless, and flushes new leaves after flowering or flowers at about the same time that new leaves are flushed; i.e., there is some association between flowering and leaf fall and flush. |  |
| Flowering not associated with leaf flush | A phenological strategy in which there is no apparent relationship between leaf drop, leaf flush, and flowering. |  |
| Higher order leaf venation | Referring to venation levels in the leaves above the tertiary veins. | |
| Imparipinnate leaf | Pinnate with an uneven number of leaflets, i.e., with a terminal leaflet. Same as odd pinnate. | |
| 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. | |
| Leaf base obtuse | Blunt, referring to the the base of a leaf blade in which the two sides are straight and, when they meet, form an angle greater than 90°. | |
| Leaf base 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 base sagittate | The base of a leaf blade shaped like an arrowhead. |  |
| Leaf base truncate | Referring to the base of a leaf blade that terminates abruptly in a nearly straight horizontal edge. | |
| Leaf blade | The expanded portion of a leaf, it and the petiole combined equal the leaf. Same as lamina. |  |
| Leaf flush | The expansion of new leaves. |  |
| Leaf flush | The expansion of new leaves. |  |
| Leaf gap | A region of parenchyma in the vascular tissue of a stem that is located above the level where a leaf trace diverges from the stem toward the leaf. |  |
| Leaf lamina | The expanded portion of a leaf, it and the petiole combined equal the leaf. Same as leaf blade. | |
| Leaf margin crenate | Referring to a leaf blade margin with teeth rounded at the apex. Compare with serrate. |  |
| Leaf margin dentate | Referring to a leaf margin with sharp teeth oriented at right angles to the central axis of the leaf blade. | |
| Leaf margin doubly serrate | Leaf blades with margins with sharp teeth oriented toward the apex with each touth in turn with a smaller tooth. | |
| Leaf margin entire | Referring to leaf blade margins that are smooth, i.e., they have no serrations or crenations. |  |
| Leaf margin erose | Referring to leaf blade margin that is jagged, i.e., uneven but not with well-defined teeth. | |
| Leaf margin lobed | Referring to rounded projections arising from the margins of a leaf blade that are cut less than one-half the distance to the midrib of the leaf blade, e.g., the leaves of the white oak group. | |
| Leaf margin serrate | Leaf blades with margins with sharp teeth oriented toward the apex. | |
| Leaf opposed | Referring to an inflorescence, infructescence, or tendril arising from the stem opposite a leaf. |  |
| Leaf scar | The scar left on a stem when a leaf falls. |  |
| Leaf sheath | Tubular, inrolled base of a leaf blade or petiole that surrounds the node and a portion of the internode; e.g., in the Cyperaceae, Poaceae, and many other monocotyledons as well as in some dicotyledons. |  |
| Leaf symmetrical | Referring to the form of a leaf with the blade equal on each side of the midrib. | |
| Leaf symmetry | Referring to the form of a leaf in relation to the midrib, if the blade on each side of the midrib is equal the leaf is symmetrical and if the blades on each side of the midrib are not equal the leaf is asymmetrical. | |
| Leaf venation acrodromous | Referring to a type of leaf venation in which two or more primary or strongly developed secondary veins arch upward from either the base or above it; perfect acrodromous is used when these veins converge near the apex; e.g., Strychnos (Loganiaceae); imperfect acrodromous is used when these veins do not converge at the apex. Based on Hickey, 1973. For more information about leaf venation see Ellis et al, 2009. |  |
| Leaf venation actinodromous | Referring to a type of leaf venation in which three or more primary veins diverge radially from a single point either at (basal actinodromous) or above (suprabasal actinodrmous) the point of attachment of the petiole. The primary veins can either converge at the apex (perfect actinodromous) or not converge at the apex (imperfect actinodromous). Based on Hickey, 1973. For more information on leaf venation see Ellis et al., 2009. | |
| Leaf venation basal acrodromous | Referring to a type of leaf venation in which two or more primary or strongly developed secondary veins arch upward from the base and converge at or close to the apex.. Based on Hickey, 1973. For more information about leaf venation see Ellis et al, 2009. |  |
| Leaf venation basal actinodromous | Referring to a type of leaf venation in which three or more primary veins diverge radially from a single point at point of attachment of the petiole. | |
| Leaf venation brochidodromous | Referring to a type of leaf venation in which the secondary veins do not terminate at the margin but join to form a series of prominent arches that form a submarginal nerve; for example, in many Myrtaceae. Based on Hickey, 1973. For more information about leaf venation see Ellis et al, 2009. |  |
| Leaf venation brochidodromous | Secondaries joined together in a series of prominent arches. Based on Hickey, 1973. For more information abouit leaf venation see Ellis et al, 2009. | |
| Leaf venation brochidodromous festooned | Referring to a type of leaf venation in which the secondary veins do not terminate at the margin but join to form a series of prominent arches that form a submarginal nerve and, in addtion, the secondary veins possess closed loops toward their apices. Based on Hickey, 1973. For more information about leaf venation see Ellis et al, 2009. |  |
| Leaf venation camptodromous | Referring to a type of leaf venation in which the secondary veins do not terminate at the margin; in one type each secondary vein connects with the seconday vein above it (brochidodromous) and in the other type the secondary veins do not connect with the secondary vein above it (eucamtodromous). Based on Hickey, 1973. For more information about leaf venation see Ellis et al, 2009. | |
| Leaf venation camptodromous | A type of leaf venation in which the secondary veins do not terminate at the margens |  |
| Leaf venation campylodromous | Referring to a type of leaf venation in which a series of more or less equal primary veins originate from a common point at the base, arch upward, and reunite toward the apex; e.g., species of Aristolochia (Aristolochiaceae). |  |