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microsporangium pl. microsporangia |
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STRUCTURE |
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A sporangium that produces microspores. |
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calyptra pl. calyptrae |
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STRUCTURE |
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A distal hood- or lid-like portion that detaches as a unit from the remainder of the structure; esp. in some Papaveraceae the unopened calyx that separates from the rest of the flower at anthesis. |
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isosepalous |
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architecture |
flower, perianth, calyx |
Having the sepals essentially alike in size and shape. |
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perisperm |
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STRUCTURE / SUBSTANCE |
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A genetically diploid (2n chromosomes) nutritive tissue in a seed; containing stored carbohydrate and/or oil utilized by the embryo prior to and especially upon germination; derived from the nucellus. See also endosperm (albumen). |
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epibracteal |
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position |
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Upon the bracts, or partially adnate thereto and apparently arising therefrom. |
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resin |
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SUBSTANCE |
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A substance of high molecular weight consisting of organic acids, esters, and/or terpenes, produced within plant tissue and exuded from wounds as a liquid that hardens to an amorphous glassy state upon exposure. |
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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. |
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craspedodromous, mixed- |
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venation |
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Having a midvein that branches to either side along the length of the lamina, the secondary veins running thence toward the margin, some becoming indistinct before reaching it, others terminating there. |
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spikeleted |
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architecture |
inflorescence |
Having the penultimate subdivisional order consisting of spikelets. |
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weeping |
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architecture |
plant |
Having elongate, flexible, pendent branches. |
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gynecandrous |
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reproduction |
taxon |
Monoecious, each inflorescence having a distal sector with only pistillate flowers and a proximal sector with only staminate ones. |
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cryptocotyloid |
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germination |
seed |
Having the cotyledon(s) remaining inside the seed coat. |
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centripetal |
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development |
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Proceeding toward the center, thus more advanced peripherally than centrally within a given frame of reference. |
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leaf scar |
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FEATURE |
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A scar on a twig or stem due to abscission of a megaphyll; having an outline like that of a transverse section through the base of the petiole, sheath, or blade that was inserted there. |
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plicate 1 |
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aestivation |
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Valvate with each member strongly infolded longitudinally. |
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accrescent |
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duration |
structure |
Increasing further in size after the bearing structure has become functionally mature; esp. a calyx after anthesis. |
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false |
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derivation |
indusium |
Constituting a marginal fold of the lamina as a whole and not a distinct enation from the epidermis. |
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asepalous |
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architecture |
flower, perianth |
Lacking sepals. |
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oblanceolate |
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plane shape |
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Inversely lanceolate (lancehead-shaped). |
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runcinate |
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plane shape |
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Basically obovate with a series of retrorse, acute lobes on either side, these diminishing in size toward the base. |
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thyrsate |
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architecture |
inflorescence |
Comprising one or more thyrses. |
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circular |
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arrangement |
bundle scars |
Forming a circle. |
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ligule 2 |
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STRUCTURE |
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An adaxial, distal enation from a leaf sheath, especially in most grasses (Poaceae) and sedges (Cyperaceae); usually unitary and membranous, sometimes instead consisting of a row of ciliate processes. See also hastula. |
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filament |
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STRUCTURE |
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The stalk, when present, of a stamen, clearly differentiated from and bearing at its summit an anther. |
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heteropolar |
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architecture |
pollen grain, spore |
Having morphologically evident polarity, the proximal and distal halves dissimilar. |
