barb 1 |
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STRUCTURE |
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Any relatively short, stiff, sharp, acutely inserted or bent, antrorse or retrorse, terminal or lateral appendage. |
waisted |
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solid shape |
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Constricted in width or breadth at or near the middle of its length. |
stipule |
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STRUCTURE |
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Any distinct, relatively diminutive, more or less foliaceous structure inserted on a stem alongside a petiole, or on a petiole near its base, and ontogenetically closely associated with the leaf; usually occurring as one of a pair disposed one to either side of the petiole. |
brochidodromous |
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venation |
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Having a single median primary vein that branches to either side along its length, the secondary veins incurving strongly near but short of the margin, interconnecting serially, and forming a succession of marginal loops. |
opposite 1 |
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arrangement |
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Disposed in pairs along the axis, the members of each pair inserted at the same level across from one another. |
apetalous |
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architecture |
flower, perianth |
Lacking petals. |
equal |
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size |
equivalent structures |
Essentially uniform in extent. See also subequal, unequal. |
costule |
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STRUCTURE |
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A longitudinal primary vein in a diminutive laminar structure, such as the blade of a leaflet, pinna or pinnule; a diminutive costa (rib). |
equatorial ridge |
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FEATURE |
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A circumferential ring about a megaspore in the plane of its equator, raised above the remainder of the wall surface; in some heterosporous taxa of Polypodiophyta. |
isosepalous |
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architecture |
flower, perianth, calyx |
Having the sepals essentially alike in size and shape. |
parietal |
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placentation |
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Upon the inner wall surface of a unilocular ovary, thus peripheral within the locule. |
subpetiolar |
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position |
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Just below the point of petiole insertion. |
…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. |
coating |
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CHARACTER |
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Exudate that covers the surface proper. See also indumentum (vesture), pubescence. |
lamella pl. lamellae |
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STRUCTURE |
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A thin layer of tissue that forms a plate within tissue of lesser density or between areas of empty space. |
phyllopodium pl. phyllopodia |
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STRUCTURE |
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A stem-like axis composed of fused leaf bases; esp. in Arecaceae (Palmae), Musaceae. |
symmetric(al) 1 |
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solid shape |
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Divisible into essentially equal halves along one or more lines or planes. |
septal |
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insertion |
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Upon or otherwise directly associated with the septum or septa. |
pericolporate |
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architecture |
pollen grain |
Pericolpate, each groove containing a pore. |
superior 1 |
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insertion |
indusium |
Inserted at or near the apex of the sorus, distal to the sporangia. |
motile |
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habit |
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Able to translocate by intrinsic means, as by flagellar propulsion. |
circumcaulous |
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insertion |
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Upon and surrounding the stem. |
annulus 2 pl. annuli |
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STRUCTURE |
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A row of protruding specialized sporangial wall cells that extends upward from the base of the sporangium and over its apex, thus forming an incomplete circumferential ring; esp. in Polypodiophyta. The inner and radial walls of the annular cells are markedly thickened and the structure functions as a spore-releasing and -disseminating mechanism as a result of differential stresses developed within the mature sporangial wall upon desiccation. |
extrafloral |
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insertion |
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Outside and proximal to the flower; esp. nectaries. |
decompound |
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architecture |
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Comprising two or more orders of equivalent substructural entities; multiply compound. |