Displaying 1376 - 1400 out of 1575 Object(s)
| Term | Definition | |
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| Stigma lined | Lines found on the stigmas of at least some species of Gustavia and Grias. In this type of stigma shape the lines are clearly separated from other parts of the ovary. |
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| Stigma lobed | A stigma divided into separate parts. |
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| Stigma punctiform | A stigma that is neither lobed or displays stigmatic lines. |
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| Stigma surface lepidote | A stigma with minute scales over its surface. |
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| Stigma surface pubescent | A stigma with septate trichomes covering what appears to be the receptive part of the stigma. |
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| Stilt roots | Aerial, woody, adventitious roots that are circular in transverse section. Stilt roots are not densely aggregated so light can be seen between the individual stilt roots; e.g., in Socratea exorrhiza (Arecaceae). |
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| Stipe | Referring to the stalk of a fern frond, the equivalent of a petiole in the flowering plants. |
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| Stipe (stipitate) | The term stipe has several different meanings: 1) in Arecaceae (palms) it is used to indicate the presence of a trunk, 2) in some Orchidaceae, a stipe is a nonsticky, elastic tissue derived from the column and connecting the pollinia to the viscidium; 3) a stalk supporting the ovary but generally much shorter than the stalk of a species with a gynophore; and 4) the stalk of a fern frond, the equivalent of a petiole in the flowering plants. A species or structure that has a stipe is said to be stipitate. |
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| Stipel (stipellate) | A small stipule at the base of leaflets and not at the base of the leaf as is the case with a true stipule, e.g., species of Andira; stipels are only found in compound leaves and a leaf that bears them is referred to as a stipellate leaf. |
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| Stipulate | Possessing stipules. |
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| Stipule | A reduced leaflike or bractlike appendage, either solitary or paired, inserted at the base of the petiole and variable in morphology. |
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| Stipule | A reduced leaflike or bractlike appendage, either solitary or paired, inserted at the base of the petiole and variable in morphology. |
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| Stipule scar | Referring to the scars left on the stem after the stipules have fallen. Because many stipules are caducous, one has to look carefully for scars to determine if stipules were present at an earlier stage of development. |
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| Stolon (stoloniferous) | A horizontal stem that is located above the ground and usually produces adventitious roots and vertical stems at the nodes. Stoloniferous refers to a plant that bears stolons. |
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| Stomatal crypt | A pit, usually on the abaxial leaf surface, in which the stomates of some species occur. |
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| Stomatal crypt | A pit, usually on the abaxial leaf blade surface, in which the stomates of nearly all species of occur. |
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| Stomate (pl. = stomates) (= stoma sing. and stomata pl.) | A small opening, usually in the abaxial surface of leaves, through which gases utilized and produced in photosynthesis pass into and out of the leaves. |
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| Stomate (plural = stomates) (= stoma and stomata) | A small opening, usually in the abaxial surface of leaves, through which gases utilized and produced in photosynthesis pass into and out of the leaves. |
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| Stone | The nut or nutlet in a drupe; i.e., the hardened part of a drupe or a duplet (= endocarp) containing a single seed. In non-scientific language it is called the pit. |
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| Strangler | A plant that grows upon another plant in such a way that its roots surround the host and eventually cause it to die; e.g., in some species of Ficus (Moraceae). A strangler can become a free-standing tree after the host plant dies. |
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| Stratification | Referring to the formation of layers in a forest, i.e., the herbaceous, shrub, understory tree, canopy tree, and emergent tree strata or layers. |
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| Striation | A fine longitudinal line, ridge, or groove. |
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| Striation (striate) | A fine line, ridge, groove, or streaks of color, an organ with striations is said to be striations. |
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| Stylar canal | A hollow channel that runs from the stigma for most of the length of the style which is thought to faciltate the growth of pollen tubes to the ovary, the ovules, and eventually the egg. |
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| Stylar collar | An annular expansion on the style; e.g., in some species of Melastomataceae and Lecythis zabucajo (Lecythidaceae). |
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