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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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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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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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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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ring-porous |
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porosity |
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Heterogeneously porous, with macroscopically distinct concentric seasonal growth increments (rings), each with numerous large vessels toward the inside and fewer and smaller ones toward the outside. |
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gynobasic |
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insertion |
style |
Apparently arising from the ovary base. |
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cuboid |
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solid shape |
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Generally but not strictly cubic; more or less equilaterally six-sided, each side basically square. |
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solitary 2 |
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habit |
plants |
Growing singly; not aggregated. |
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thyrse |
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nominative |
inflorescence |
An elongate, indeterminate main axis bearing numerous lateral branches, each the principal axis of a cymose subdivision. |
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aseptate |
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architecture |
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Lacking internal walls or partitions (septae). |
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circumcaulous |
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insertion |
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Upon and surrounding the stem. |
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ligule 3 |
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STRUCTURE |
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A relatively small, attenuate, membranous, laminar enation from the adaxial surface of a leaf near its base; in Selaginella, Isoetes. |
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filamentous |
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texture |
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Composed of filiform (thread-like) strands with no intervening tissue. |
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heterosporous |
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reproduction |
taxon |
Producing two types of spore, microspore and megaspore, which are sexually distinct and usually different in size, each megaspore giving rise to a megagametophyte, each microspore to a microgametophyte. |
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sectile |
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architecture |
pollinium |
Having partially separated sectors, as though cut. |
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tuberous 2 |
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architecture |
structure |
Resembling a tuber in shape and texture, but not ontogenetically such; esp. roots. |
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beard |
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STRUCTURE |
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A growth of relatively long, erect, flexible, capillary trichomes from one or more limited sectors of a structure's surface. |
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husk |
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STRUCTURE |
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A more or less dry, hard or fibrous, simple or compound enclosure or outer layer of a seed, fruit or inflorescence. |
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ovule |
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STRUCTURE |
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A complex reproductive structure borne by a seed-plant sporophyte, consisting of outer, sporophytic tissues that enclose a haploid, gametogenic tissue usually regarded as a highly reduced megagametophyte. Following fertilization, the entire structure matures to become a seed that contains an embryo, the first stage of the next sporophytic generation. Ovules (and seeds) are borne naked on megasporophylls (in Pinophyta) or within an ovary (in Magnoliophyta). |
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discal |
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position |
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Upon or otherwise directly associated with the floral disc. |
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loose 2 |
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texture |
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Soft overall, discontinuously and only weakly cohesive. |
