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perianth tube |
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STRUCTURE |
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A relatively narrow, fully connate portion of a syntepalous (gamotepalous) perianth proximal to a broader portion (limb) that comprises the distinct or connate distal portions of the tepals. |
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sinus pl. sinus, sinuses |
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FEATURE |
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The space, indentation, or invagination (or, for some descriptive purposes, the outline thereof) between and delimiting any two consecutive or adjacent lobes or teeth of a structure. |
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anisosepalous |
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architecture |
flower, perianth, calyx |
Having sepals unequal in size and/or shape. |
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surface |
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FEATURE |
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The exterior or bounding area or layer of any structure, regarded as being infinitely thin; usually described as to relief, reflectance, and/or vesture. |
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corymbose |
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architecture |
inflorescence |
Comprising one or more corymbs. |
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piliferous |
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apex |
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Having a distinct, fine, weak, hair-like portion or protrusion. |
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apolar |
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architecture |
pollen grain, spore |
Lacking morphologically evident polarity. |
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neck (archegonial) |
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STRUCTURE |
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The distal narrowed portion of an archegonium above its bulbous base. |
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neck (floral tube) |
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STRUCTURE |
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The solid, usually constricted portion of a floral tube sometimes present between casing and collar when those are both present. |
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cauline |
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insertion |
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Upon, arising from, or otherwise directly associated with the stem. |
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lateral |
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insertion |
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To, toward, at, or upon a side, not apical or basal. |
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planoconcave |
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solid shape |
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Relatively thin with opposite broad faces, one plane and one concave. |
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extravaginal |
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insertion |
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Distal to or outside the leaf sheath. |
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arrangement |
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CHARACTER |
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Disposition of equivalent structures with respect to one another (positions/insertions and/or orientations, regarded collectively) within some explicit or implicit standard context. Overlaps conceptually with habit, insertion, orientation, position, and shape. |
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haplomorphic |
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architecture |
flower |
Having the members of each set of basic floral structures numerous and spirally arranged, the flower hemispheric to conoidal overall. |
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thallus 2 pl. thalli |
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STRUCTURE |
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The main body of a gametophyte, bearing rhizoids, gametangia (antheridia and/or archegonia), and/or gemmae cups; usually thin and more or less planate, inconspicuous, and growing appressed to or beneath the substrate surface; in Psilotophyta, Lycopodiophyta, Equisetophyta, Polypodiophyta. See also prothallus. |
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leptosporangiate |
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reproduction |
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Having relatively small sporangia each of which develops from a single initial cell that, by periclinal division, gives rise to an outer and an inner cell, the former then giving rise to the entire sporangium, including contents and sporangiophore, the latter contributing nothing to it; in some Polypodiophyta. |
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herbaceous 2 |
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texture |
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Composed entirely of relatively soft, non-woody (unlignified) tissues derived from primary growth. |
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sawtooth |
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STRUCTURE |
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One of a series of regularly spaced, angular, marginal convexities oriented at an acute angle to the generalized perimeter of a laminar structure. See also sawtoothlet, scallop (crena), scalloplet (crenule), tooth, toothlet. |
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basicaulous |
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position |
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At or very near the stem base. |
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orientation |
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CHARACTER |
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Attitude or direction with respect to some explicit or implicit structure(s) or context. The lexicon relating to orientation includes some conceptually complex terms whose meanings also embrace aspects of structural composition or shape. Overlaps conceptually with arrangement, habit, insertion, position, and shape. |
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dimidiate |
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plane shape |
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Halved, figuratively; bilaterally asymmetric, nearly or wholly lacking one side as implicitly compared with some corresponding bilaterally symmetric structure, real or imagined. |
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stipule scar |
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FEATURE |
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A scar on a stem or petiole due to abscission of a stipule; having an outline like that of a transverse section through the base of the stipule inserted there; variously disposed, usually in pairs, adjacent to a point of leaf insertion, sometimes confluent with the leaf scar, sometimes confluent with stipule scars associated with an opposite leaf, the two sets of scars then more or less encircling the axis. |
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clustered 1 |
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arrangement |
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Disposed in one or more aggregates, the members of each inserted close together, thence widely divergent from one another. |
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palmatipinnate |
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architecture |
foliaceous structure |
Compound with two orders of leaflets, the first order palmate, the second pinnate. |
