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heartwood |
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STRUCTURE |
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The senescent inner or central portion of the wood (xylem) of an older stem or root, its cells no longer living, in which conduction has ceased and primary reserve materials are no longer stored; often containing terminal metabolic products; usually darker in color than the living, conducting sapwood that encircles it. |
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hydathode |
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STRUCTURE |
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A multicellular, anatomically distinctive structure located within a leaf at its periphery, its cells surrounding a central canal that opens to the exterior, through which water is actively discharged under humid conditions that impede the rate of transpiration; this liquid discharge is termed guttation. |
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involute 2 |
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vernation |
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Each rolled adaxially from the lateral margins. |
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lenticel |
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STRUCTURE |
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A specialized, anatomically distinct structure within the periderm of a stem, consisting of comparatively spongy, sometimes suberized tissue distinct from others of the periderm; extending radially through the periderm and visible as a circular to elongate discontinuity in the color, texture, and/or relief of the outer surface of the stem; serving as a conduit for gas exchange between the stem interior and the atmosphere. |
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revolute 1 |
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margin |
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Rolled inward abaxially. |
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lanulose |
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pubescence |
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Finely lanate. |
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anisostemonous |
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architecture |
flower, androecium |
Having stamens unequal in size and/or shape. |
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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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acroscopic |
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orientation |
subordinate structure |
Directed, facing, or pointing ("looking") toward the apex of the bearing structure. |
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septate 2 |
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architecture |
trichome |
Unicellular to multicellular with transverse partitions (septa) that are common cell walls (intercellular) and/or intrusions from longitudinal cell walls (intracellular). |
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drupelet |
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nominative |
fruit |
Diminutively drupe-like but derived from one of the simple, superior ovaries of an apocarpous flower, having a fleshy fruit wall and a hard seed (pyrene) within, a distinct constituent in an aggregate fruit; esp. in Rosaceae. |
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sterigma pl. sterigmata |
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STRUCTURE |
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A portion of a lamina that is prolonged and adherent to the supporting axis beneath the point of vascular insertion. |
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obcordate |
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plane shape |
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Inversely cordate (heart-shaped). |
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dull |
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reflectance |
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Reflecting only a low proportion of incident light, with no apparent sheen. |
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sterile |
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reproduction |
plant, reproductive structure |
Not producing functional spores, gametes, pollen, ovules, seeds, or other propagules. |
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obcordiform |
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solid shape |
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Inversely cordiform (heart-shaped). |
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eucamptodromous |
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venation |
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Having a single median primary vein that branches to either side along the length of the lamina, the secondary veins upwardly arcuate, gradually becoming indistinct interior to the margin, and serially interconnected by cross-branches without formation of marginal loops. |
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perennate |
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duration |
structure |
Persisting in a functional state through the entire growing season. |
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farina pl. farinae, farinas |
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SUBSTANCE |
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A dry, meal- or flour-like covering. |
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pliestesial |
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duration |
plant |
Perennial and monocarpic, living several to many years before reproducing sexually, dying promptly thereafter. |
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symmetric(al) 1 |
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architecture |
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Divisible into essentially equal halves along one or more lines or planes. |
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caudex pl. caudices |
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STRUCTURE |
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The short, persistent, thickened, more or less erect, main stem of a perennial plant that otherwise has annual stems. |
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apiculum 2 pl. apicula |
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STRUCTURE |
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The apex of a connective, when prolonged above the union of the anthers. |
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capsular |
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architecture |
fruit |
Having the structure and texture of a capsule. |
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connivent |
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arrangement |
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Converging and distally contiguous; esp. arcuate stamens with anthers contiguous. |
