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laesura pl. laesurae |
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FEATURE |
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An elongate aperture in the proximal face of a spore at or near its pole, coterminous with a tetrad scar; in Psilotophyta, Lycopodiophyta, Equisetophyta, Polypodiophyta. Depending upon tetrad configuration and resultant scar pattern, a laesura may be either unbranched or branched, the branches when present (usually 3) radiating from the pole and of approximately equal lengths. |
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veined |
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architecture |
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Having one or more orders of evident vasculature. |
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oblique 2 |
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orientation |
planate lateral structure |
Lying in a plane not coincident with the one defined by its longitudinal axis and that of the bearing structure. |
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coating |
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CHARACTER |
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Exudate that covers the surface proper. See also indumentum (vesture), pubescence. |
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costal |
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insertion |
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Upon or otherwise directly associated with the costa(e) of a laminar structure. |
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apiculate |
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apex |
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Terminating abruptly in a short, slender, angular tip that is not notably harder or stiffer than the main body of the structure. See also mucronate, mucronulate. |
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diplotegium pl. diplotegia |
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nominative |
fruit |
A pyxis with accessory tissue adnate to the pericarp; derived from an inferior ovary. |
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acrodromous |
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venation |
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Having two or more primary and/or strongly developed secondary veins that diverge at or above the laminar base and are thence convergently arcuate toward the apex, reaching it or not. |
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nucellus pl. nucelli |
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STRUCTURE |
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The distinct, genetically diploid tissue layer immediately surrounding the embryo sac of an ovule; often considered equivalent to a megasporangium wall. |
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flagellum pl. flagella |
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STRUCTURE |
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A very slender whip-like structure that extends from the main body of an antherozoid and, by active undulation, propels the cell through a liquid medium. |
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villosulous |
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pubescence |
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Finely villose (shaggy, villous). |
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ridged |
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solid shape |
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Having one or more ridges; esp. fruits of Apiaceae (Umbelliferae). |
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leptosporangiate |
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reproduction |
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Having relatively small sporangia each of which develops from a single initial cell that, by periclinal division, gives rise to an outer and an inner cell, the former then giving rise to the entire sporangium, including contents and sporangiophore, the latter contributing nothing to it; in some Polypodiophyta. |
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septal |
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insertion |
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Upon or otherwise directly associated with the septum or septa. |
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…merous |
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architecture |
compound or compound-complex structure |
Having the number of equivalent component parts indicated by the prefix (e.g., petals in a corolla), or having different component sets of equivalent parts of that number in each set (e.g., calyx and corolla in a perianth); as in monomerous, oligomerous, polymerous, tetramerous, trimerous. |
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intricate |
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arrangement |
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Entangled; irregularly intertwined and not readily disentangled. |
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basicauliramous |
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architecture |
plant |
Having the stem(s) branching at or near the base. See also basiramous. |
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parallelodromous |
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venation |
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Having two or more primary veins that run more or less parallel to one another over most of the laminar length and converge near the apex. |
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funicular |
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derivation |
aril |
Produced from or a modification of the funiculus (funicle). |
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decurrent |
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base |
laminar structure |
Having the lamina prolonged and adherent to the supporting axis beneath the point of vascular insertion, the prolonged portion termed a sterigma. |
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andromonoecious |
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reproduction |
taxon |
Having all plants with both bisexual flowers and staminate ones. |
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motile |
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habit |
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Able to translocate by intrinsic means, as by flagellar propulsion. |
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syncarpous |
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architecture |
flower, gynoecium |
Having one or more compound pistils. |
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radiant 1 |
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architecture |
capitulum (head) |
Bearing one or more peripheral series of florets that are bisexual, pistillate, or neuter and that have relatively large actinomorphic corollas, and one or more central series of usually bisexual florets that have relatively small actinomorphic corollas; in Asteraceae (Compositae). |
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knee root |
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STRUCTURE |
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A specialized secondary root of a wetland tree, a portion of which projects above mean water level and appears to bend as a leg does at the knee, its distalmost portion being anchored in the substrate beneath the water. The knee of the root is commonly regarded as a conduit for gas exchange between root interior and atmosphere, a function whose need is posited on the basis of the highly anaerobic and saturated conditions prevailing in wetland substrates. |
