Displaying 1 - 40 out of 69 Object(s)
| Term | Definition | |
|---|---|---|
| Compound leaf | Referring to a leaf which is divided into smaller units; i.e., leaflets. Opposite of simple. |  |
| 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. |  |
| Even-pinnate leaf | Pinnately compound leaf with an even number of leaflets; i.e., without a terminal leaflet. Same as parapinnate. |  |
| Imparipinnate leaf | Pinnate with an uneven number of leaflets, i.e., with a terminal leaflet. Same as odd pinnate. | |
| 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 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. |  |