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sheath (leaf) |
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STRUCTURE |
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The lower (basal or proximal), fundamentally laminar but strongly involute portion of one of the non-petiolate leaves characteristic of most monocotyledons (Liliidae); distinct from the leaf blade, which, when present, is borne distally upon it; analogous, though not necessarily homologous, with a petiole; usually more or less completely enclosing a portion of the stem above the node from which the leaf is borne. |
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involucre 2 |
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STRUCTURE |
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One or more closely proximate whorls, or a compact spiral, of bracts (phyllaries) surrounding (proximal to) the compound receptacle (torus) and florets of a capitulum (head); in Asteraceae (Compositae). |
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periclinal |
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orientation |
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Parallel to some given plane of reference; applied especially to the plane of cell division when it is oriented parallel to the generalized plane of the structural surface. |
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size |
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CHARACTER |
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Nature as to absolute or comparative extent in any one dimension or in area or volume. |
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ventrifixed |
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fixation |
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Attached on the adaxial side well above the base. |
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annual 1 |
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duration |
plant, stem |
Normally living one year or less; growing, reproducing, and dying within one cycle of seasons. |
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monopodial |
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architecture |
axes |
Branching laterally, each axis of each order of branches produced by a single, persistently dominant, apical meristem. See also sympodial. |
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costal |
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insertion |
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Upon or otherwise directly associated with the costa(e) of a laminar structure. |
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pilosulous |
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pubescence |
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Finely pilose. |
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watery |
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texture |
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Liquid and weakly cohesive, flowing freely; like water. This term often implies also transparency. |
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epulvinate |
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architecture |
inflorescence axis, petiole |
Lacking a pulvinus. |
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nectar |
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SUBSTANCE |
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An aqueous exudate of high sugar content. |
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rhytidomal |
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insertion |
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Within, upon, or otherwise directly associated with the bark. |
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cauline |
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position |
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Upon, arising from, or otherwise directly associated with the stem. |
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lateral |
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position |
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To, toward, at, or upon a side, not apical or basal. |
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planoconvex |
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solid shape |
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Relatively thin with opposite broad faces, one plane and one convex. |
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extravaginal |
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position |
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Distal to or outside the leaf sheath. |
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nutlet |
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nominative |
fruit |
A small, relatively hard-coated mericarp; esp. in Lamiaceae (Labiatae), Verbenaceae. |
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cylindric(al) |
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solid shape |
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Solid and transversely round with a more or less uniform diameter, the ends blunt. |
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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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stamen |
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STRUCTURE |
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A seed-plant organ that produces and releases pollen; usually comprising a stalk (filament) that bears a locular structure (anther) containing sporogenous tissue; however, the filament may be lacking and the anther sessile, or the stamen may be undifferentiated, the whole then consisting of microsporangia embedded in or borne upon the surface of a more or less planate body of sterile tissue; one of the constituent organs of a bisexual or a staminate flower; may be distinct or else connate with one or more others and/or may be free or else adnate with one or more other floral structures. |
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obvolute 2 |
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vernation |
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Conduplicate with the lateral edges of each leaf alternately overlapping those of the oppositely oriented, distally next adjacent one. |
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basipetal |
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development |
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Proceeding toward the base, thus more advanced apically or distally than basally or proximally within a given frame of reference. |
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prothallus pl. prothalli |
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STRUCTURE |
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A very diminutive thallus that is reproductively mature and undergoes no further growth; in Polypodiophyta, Pinophyta. |
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coalescent |
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fusion |
equivalent and/or dissimilar structures |
Partially and irregularly coherent and/or adherent. |
