Displaying 1 - 40 out of 66 Object(s)
Term | Definition | |
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Aerenchyma | Tissue with large,intercellular, air-filled spaces; e.g., in the petioles of many species of Araceae and in the roots, stems, and leaves of many aquatic plants. | |
Bud | A young shoot from which leaves or flowers may develop, the former is a leaf bud and the latter is a flower bud. | |
Bud naked | Referring to a bud that is not covered by bud scales. | |
Bud scale | A reduced leaf that encloses a bud. | |
Cephalium (plural = cephalia) | An enlargement with a dense covering of hairs at the apex of the stem in some Cactaceae. | |
Chambered pith | Referring to a pith that has chambers in the stem caused by septations at right angles to the long axis. | |
Cladode | A flattened, green, photosynthetic stem; e.g., in some Cactaceae. | |
Cortex | The tissue in a stem or root between the epidermis and the vascular tissue. | |
Cortical bundle | Referring to a a vascular bundle that penetrates the cortex of the stems of plants. | |
Cystolith | A crystal typically of calcium carbonate (CaCO3) located in the epidermal cells at the surface of leaves of certain plants (e.g., Acanthaceae) and appearing as a light-colored streak or protuberance. | |
Druse | A mace-shaped mass of calcium carbonate that forms in some plant cells. | |
Epicortical roots | In some Eremolepidaceae and Loranthaceae, roots that develop from the cortex of the stem to form secondary points of attachment to the host. | |
Fiber | An elongated, usually tapering, sclerenchyma cell found in wood. | |
Glochid | A very thin and usually deciduous, barbed spine characteristic of some Cactaceae (Opuntioideae). | |
Glochidiate | Barbed; bearing glochids. | |
Ground tissue | Plant tissue other than the vascular tissue, the epidermis, or the periderm. | |
Hapter (plural = haptera) | Disclike or irregularly formed lateral outgrowths of roots (rarely shoots) that affix plants of many Podostemaceae to the substrate. Same as holdfast. | |
Haustorium (plural = haustoria) | The tissue-penetratingand food-absorbing organ of a parasitic plant. | |
Holdfast | See hapter. | |
Hydathode | A structural modification, usually in leaves, that permits the release of water through an opening in the epidermis. | |
Hydropote | In the Myrsinaceae, a multicellular, epidermal structure, often of leaves, serving for the absorption of water and mineral salts. When young, hydropotes consist of a basal stalk and a group of cap cells, but at maturity the superficial structure breaks off and the remaining depression often regulates water as a hydathode. | |
Intercalary | Inserted between adjacent tissues or structures. | |
Internode | The part of the stem between nodes. | |
Interpetiolar glands | Excretory structures located between the petioles of some plants; e.g., species of Bignoniaceae. | |
Intravaginal squamules | Scalelike structures found in the axils of the leaves of Alismataceae, Araceae, and Cymodoceaceae. | |
Lateral bud | A bud arising in the axil of a leaf. Same as axillary bud. | |
Laticifer | A latex-producing cell or series of cells. | |
Meristem | Undifferentiated plant tissue from which new cells arise. | |
Mucilage | A sticky, viscous liquid; e.g., that present among the leaf bases of Rapateaceae or in canals penetrating the ovary and sepals of some Lecythidaceae. | |
Muellerian bodies (also spelled Müllerian bodies) | Glycogen-rich food bodies located on fuzzy pads (trichilia) at the base of the petiole of some species of Cecropia (Cecropiaceae). Compare with pearl bodies. | |
Node | The part of the stem where buds, leaves, and or adventitious roots are produced. | |
Ocrea | A structure formed of stipules fused into a sheath and surrounding the stem; i.e., a diagnostic character of the Polygonaceae; in palms, an extension of the leaf sheath beyond the petiole insertion, is a different kind of ligule. | |
Oral setae | Coarse, bristlelike appendages present at the summit of the leaf sheaths of some grasses. | |
Parenchyma | Ground tissue composed of mostly isodiametric, thin-walled cells that usually retain the ability to divide. | |
Perula (plural = perulae, adj. = perulate) | A scale of a leaf bud. The same as bud scale. | |
Phylloclade | A branch that has taken on the form and function of a leaf. | |
Phyllode | A petiole and or rachis that has taken on the form and function of a leaf; e.g., in certain species of Acacia. | |
Pith | The spongy ground tissue occupying the center of many stems. | |
Polystelic | Referring to a stem with more than one vascular bundle. | |
Prostoma (plural = prostomata) | An indented and/or membranous area through which plant-associated ants bore into the hollow chambers of the trunks and stems; e.g., in many species of Cecropia (Cecropiaceae). |