Displaying 41 - 66 out of 66 Object(s)
| Term | Definition | |
|---|---|---|
| Pseudobulb | In Orchidaceae, a specially modified stem that is variously swollen and stores food and water. Pseudobulbs are common in epiphytic but are lacking in terrestrial species. |  |
| Pseudospikelet | A group of indeterminate, spikeletlike structures that develop from buds, are subtended by glumelike, sterile bracts, and are found in some Bambuseae and a few other Poaceae. | |
| Pseudostem | The apparent stem of Musa (Musaceae), Phenakospermum (Strelitziaceae), and some other monocots which is actually a cylinder formed by overlapping leaf bases. |  |
| Radicant | Rooting, usually referring to a prostrate or aerial stem giving rise to roots at the nodes. | |
| Ramicaul | Secondary stem of some Orchidaceae. | |
| Ranalean odor | See ethereal oils. | |
| Raphide | A needle-shaped crystal of calcium oxalate found in the cells of some plants. | |
| Sclereid | A thick-walled,lignified cell that is variable in form. | |
| Sclerenchyma | Tissue composed of dead, thick-walled cells, such as stone cells and fibers. | |
| Secondary growth | Plant tissue derived from lateral meristems. | |
| Stele | The vascular cylinder of a stem or root. | |
| Stem | The main ascending axis of a plant. |  |
| Stem angular | Referring to a stem that is not round in cross section, e.g. it can be flattened or angled as in sedges. | |
| Stem hollow | Referring to a stem that does not have tissue in the center, e.g., the hollow stems of grasses. | |
| Stem solid | Referring to a stem that has tissue in the middle, i.e., the cortex is solid. | |
| Stone cell | A short, roughly isodiametric sclereid. | |
| Tendril at right angle | Referring to a tendrial that arises at a right angle to the leaf, e.g., species of Cucurbitaceae. |  |
| Tendril axillary | A tendril that arise in the axil of a leaf blade, e.g., species of Passiflora. |  |
| Tendril leaf opposed | A tendril that arises opposite the insertion of a leaf; for example, Parthenocissus quinquefolia and many othe species of Vitaceae. |  |
| Terminal bud | A bud that terminates the end of a stem or a twig. |  |
| Trichilium (plural = trichilia) | A pad of densely clustered trichomes located at the abaxial base of the petiole of some species of Cecropia (Cecropiaceae) and containing Muellerian bodies that are a source of food for ants. |  |
| Trichosclereid | A branched schlerenchymatous cell with thin, hairlike extensions into the intercellular spaces. | |
| Vacuole | A space or cavity within the cell. | |
| Vascular | Referring to the xylem and phloem. | |
| Vascular trace | That part of a vascular bundle extending from the vascular cylinder of the stem into the base of the leaf. |  |
| Velamen | A spongy covering of one or two layers of cells derived from the epidermis and surrounding the roots of Orchidaceae and Araceae. The velamen is usually white and functions to absorb mineral-rich water when it rains. |