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stipule scar |
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FEATURE |
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A scar on a stem or petiole due to abscission of a stipule; having an outline like that of a transverse section through the base of the stipule inserted there; variously disposed, usually in pairs, adjacent to a point of leaf insertion, sometimes confluent with the leaf scar, sometimes confluent with stipule scars associated with an opposite leaf, the two sets of scars then more or less encircling the axis. |
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stolon |
= runner |
STRUCTURE |
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A slender stem that grows horizontally upon or just beneath the ground surface, rooting at the nodes and giving rise to erect shoot segments at some nodes and/or at its apex. |
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stoloniferous |
= runnering, sarmentose |
architecture |
plant |
Producing stolons (runners), by means of which it propagates vegetatively. |
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stoma 1 (broad sense) pl. stomata |
= stomatal apparatus, stomate |
STRUCTURE |
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A localized functional epidermal unit consisting of a microscopic pore and two encircling specialized cells, the guard cells, which, through changes of turgor pressure in response to environmental conditions, regulate the size of the pore and thus the rates of transpiration and gas exchange through it; the whole surrounded or not by associated, cytologically distinctive epidermal cells, the subsidiary or accessory cells, which, when present, are regularly oriented in relation to it. |
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stoma 2 (strict sense) pl. stomata |
= stomatal pore |
FEATURE |
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The aperture between and regulated by the two guard cells of a stomate (stomatal apparatus). |
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stomatal apparatus |
= stomate, stoma (broad sense) |
STRUCTURE |
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A localized functional epidermal unit consisting of a microscopic pore and two encircling specialized cells, the guard cells, which, through changes of turgor pressure in response to environmental conditions, regulate the size of the pore and thus the rates of transpiration and gas exchange through it; the whole surrounded or not by associated, cytologically distinctive epidermal cells, the subsidiary or accessory cells, which, when present, are regularly oriented in relation to it. |
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stomatal pore 1 |
= stoma (strict sense) |
FEATURE |
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The opening between and regulated by the two guard cells of a stomate (stomatal apparatus). |
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stomatal pore 2 |
= stomium |
FEATURE |
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The opening in the wall of a sporangium, between the lip cells, through which the spores exit; in Psilotophyta, Lycopodiophyta, Equisetophyta, Polypodiophyta. |
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stomate |
= stomatal apparatus, stoma (broad sense) |
STRUCTURE |
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A localized functional epidermal unit consisting of a microscopic pore and two encircling specialized cells, the guard cells, which, through changes of turgor pressure in response to environmental conditions, regulate the size of the pore and thus the rates of transpiration and gas exchange through it; the whole surrounded or not by associated, cytologically distinctive epidermal cells, the subsidiary or accessory cells, which, when present, are regularly oriented in relation to it. |
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stomate-bearing |
= stomatiferous |
architecture |
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Having stomates present in the epidermis. |
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stomatiferous |
= stomate-bearing |
architecture |
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Having stomates present in the epidermis. |
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stomium pl. stomia |
= stomatal pore |
FEATURE |
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The opening in the wall of a sporangium, between the lip cells, through which the spores exit; in Psilotophyta, Lycopodiophyta, Equisetophyta, Polypodiophyta. |
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stone |
= pyrene |
STRUCTURE |
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The hard inner portion of a drupe, consisting of osseous endocarp and included seed. |
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stone fruit |
= drupe |
nominative |
fruit |
Fleshy, indehiscent and derived from a single, superior, simple or compound ovary; having a soft outer wall (exocarp and mesocarp) and an osseous inner stone (endocarp) containing the seed(s) (usually only one). |
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straight |
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course |
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Lacking significant curves or bends. |
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strap-shaped |
= liguliform, lorate |
solid shape |
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Elongate and relatively thin with the opposite faces more or less plane and moderately narrow, their edges more or less straight and parallel over most of their length; resembling a strap. |
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streaked 1 |
= striate |
coloration |
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Having an overall pattern of fine, more or less parallel lines of contrasting hue and/or intensity. |
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streaked 2 |
= striate; < lineate |
relief |
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Covered with very narrow and shallow, relatively long, more or less straight and parallel depressions. |
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striate 1 |
= streaked |
coloration |
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Having an overall pattern of fine, more or less parallel, lines of contrasting hue and/or intensity. |
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striate 2 |
= streaked; < lineate |
relief |
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Covered with very narrow and shallow, relatively long, more or less straight and parallel depressions. |
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strict |
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course |
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Lacking any curve or bend. |
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strigillose |
= strigulose |
pubescence |
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Finely strigose. |
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strigose |
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pubescence |
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Bearing sharp, rigid, appressed, capillate trichomes. See also strigillose (strigulose). |
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strigulose |
= strigillose |
pubescence |
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Finely strigose. |
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striped |
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coloration |
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Having one or more elongate, relatively narrow and, when multiple, more or less parallel, areas of contrasting hue and/or intensity. |