Displaying 1226 - 1250 out of 1575 Object(s)
| Term | Definition | |
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| Riverine | See riparian. |
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| Rosette | An arrangement of leaves radiating from the base of the stem and usually placed close to the ground. |
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| Rostellum (plural = rostella) | The portion of the stigma of some Orchidaceae that separates the anther from the fertile part of the stigma and aids in gluing the pollinia to the pollinators; a small beak. |
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| Rosulate | Referring to a cluster of leaves arranged in a rosette. |
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| Rounded | Referring to a leaf blade that is curved at the apex with an angle greater than 90 degrees at the point where the two sides meet. |
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| Rugose (diminutive = rugulose) | Having a wrinkled surface. |
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| Rugose hypanthium | Refers to a hypanthium with a wrinkled surface. |
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| Ruminate endosperm | Testa or seed coat folded into the endosperm; e.g., that of many species of Annonaceae, Myristicaceae, and Arecaceae. |
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| Runner | A slender stolon that periodically roots to produce an offshoot of the original plant. |
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| Running buttress | A thick, rounded buttress that extends along the ground several meters or more from the trunk. Compare with flying buttress and plank buttress. |
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| Rupicolous | Dwelling among rocks. |
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| Sagittate | Shaped like an arrowhead. |
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| Salient | Raised from the surface, usually referring to veins of leaves. |
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| Salient | Markedly raised above the surface of an organ; e.g., the midrib on the abaxial side of the leaf blade in most species of neotropical Lecythidaceae. |
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| Salverform | Referring to the shape of a sympetalous corolla in which the tube is slender and the lobes are abruptly spreading and flat. Same as hypocrateriform and more frequenly used by authors than that term. |
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| Samara | An indehiscent, winged fruit; e.g., those of Machaerium spp. and Vataireopsis spp. (Fabaceae). |
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| Sap | A free-flowing exudate that can be translucent, colorless, yellow, orange, or red. It is not as thick and viscous as latex. |
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| Saprophyte | A heterotrophic plant that is without chlorophyll, lives on decayed plant material, and usually depends on a symbiotic relationship with a fungus to obtain food. |
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| Sapwood | The outer functional part of the xylem, i.e., the living part of the xylem that transports water and nutrients to the leaves. Same as soft bast. |
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| Sarcotesta | Estructura carnosa que se origina en el tegumento y recubre a la semilla. Comparar con eleosoma y arilo. |
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| Sarcotesta | A layer arising from the integument of a seed. Compare with aril and elaiosome. |
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| Sarcotesta | A fleshy layer of the seed coat that attracts animals and aids in seed dispersal. |
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| Savanna (also spelled savannah) | A type of vegetation with scatttered shrubs and relatively small, often contorted trees with thick bark and grasses and sedges dominating the understory. |
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| Saxicolous | Referring to a plant that prefers growing in rocky habitats. |
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| Scalariform | Arranged as in the rungs of a ladder; ladderlike. |
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