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placenta pl. placentae, placentas |
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STRUCTURE |
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An ovule-bearing zone of the tissue surface bordering an ovary locule; of merely topographic, not histological, significance; may be a part of the ovary wall proper or an extension from it, or a part of the central axis of the ovary or an extension from it. |
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floating 2 |
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location |
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At or upon the surface of water. |
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pseudolamina pl. pseudolaminae |
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STRUCTURE |
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The expanded part of a phyllode (phyllodium), resembling a blade but evolutionarily derived from the petiole. |
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bundle scar |
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FEATURE |
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A smaller scar within the bounds of a leaf scar at the point where a vascular bundle traversed the abscission layer between stem and leaf. |
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ramal |
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insertion |
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Upon or otherwise directly associated with the stem branches. |
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pyramidal |
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solid shape |
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Transversely triangular or polygonal, broadest at the base and regularly attenuate to an angular apex, all faces essentially plane. |
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antipetalous |
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position |
equivalent floral structures |
Each inserted directly above or below a petal. In place of this term, the phrase "opposite the petals" is often used, but that contradicts the sense of opposite as otherwise employed (arrangement of lateral structures along an axis) and should be avoided. |
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repand |
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margin |
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Gently or shallowly sinuate. |
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integument |
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STRUCTURE |
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A distinct layer of tissue that encloses and serves to protect the other tissues of an organ, especially a seed. |
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sapwood |
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STRUCTURE |
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That portion of the wood (xylem) of a stem or root whose cells are still living and functional; concentric about the heartwood once the latter has begun to form. |
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cauline |
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insertion |
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Upon, arising from, or otherwise directly associated with the stem. |
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arcuate 2 |
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plane shape |
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Elongate and more or less regularly curved from one end to the other, one side convex, the opposite concave. |
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indeterminate |
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development |
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Having the lateral (peripheral, basal, or proximal) portions differentiating first and the terminal (central, apical, or distal) portion later, development thus proceeding sequentially upward or inward. |
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isostemonous |
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architecture |
flower, androecium |
Having the stamens essentially alike in size and shape. |
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smooth 2 |
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relief |
bark |
Unfissured; not cracked or split to any significant degree. |
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levering |
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habit |
trichome |
Forming part of a pappus and reflexing at maturity, thus helping to loosen the individual fruit (cypsela) from the capitulum (head); in Asteraceae (Compositae). |
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aciculate |
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coloration |
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Having fine, irregularly oriented, straight streaks of contrasting hue and/or intensity. |
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siliceous |
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texture |
epidermis, trichome |
Containing deposits of silica, thus hardened and abrasive. |
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spinescent |
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architecture |
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Becoming spinose. |
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corolla pl. corollae, corollas |
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STRUCTURE |
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Collectively, the petals of a flower, whether distinct or connate; the inner or distal envelope of a differentiated perianth, whether the other envelope (calyx) is actually present or is deemed to be absent due to evolutionary reduction. |
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staminodial |
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position |
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Upon or otherwise directly associated with the staminodes. |
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cymulose |
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architecture |
inflorescence |
Comprising one or more cymules. |
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subtending |
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position |
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Arising from the axis just below and very near to the base of some other specified lateral structure. This term is meaningless if the structure that is subtended is not indicated. |
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diplecolobal |
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arrangement |
cotyledons |
Incumbent but with the cotyledons folded together twice or more, the folds transverse. |
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muriculate |
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relief |
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Finely muricate. |
