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subsidiary cell |
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STRUCTURE |
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One of the cytologically distinctive epidermal cells that are sometimes present in a stomate and that surround and are regularly oriented in relation to the guard cells. |
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interrupted 2 |
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architecture |
inflorescence |
Having one or more gaps in an otherwise uniform distribution of flowers or branch units along the main axis. |
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percurrent 1 |
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architecture |
primary or secondary laminar veins |
Running through the entire length of the lamina (blade), or all the way to its margin. |
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simple 1 |
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architecture |
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Externally unitary and comprising only one basic morphological unit; not compound in either sense of that term. |
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aciculate |
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coloration |
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Having fine, irregularly oriented, straight streaks of contrasting hue and/or intensity. |
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coetaneous |
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maturation |
dissimilar structures |
Maturing concurrently. This adjective is frequently used to mean contemporary maturation of leaves and flowers, but without actually stipulating that those are the structures involved. Such usage is erroneous according to the construction and literal meaning of the term, which properly applies to structures, not to the taxon or plant. See also synanthous. |
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monadal |
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arrangement |
pollen |
Shed singly, or essentially so, only loosely and irregularly, if at all, coherent, each original tetrad having separated fully. |
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spadix pl. spadices |
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STRUCTURE |
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A thick, fleshy, primary inflorescence axis bearing sessile flowers more or less sunken into its surface, the whole subtended and sometimes partially enclosed by a specialized bract, the spathe; esp. in Araceae. |
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concentric |
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position |
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Having a center or axis of symmetry coincident with that of the context of reference. |
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bud |
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STRUCTURE |
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A rudimentary, unexpanded stem, stem branch, inflorescence, inflorescence branch, or flower, or a combination thereof, in a resting state; enveloped or not by subtending protective scales. |
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elaminate |
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architecture |
foliaceous structure |
Lacking an expanded, more or less planate, distal portion (lamina or blade). |
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revolute 2 |
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vernation |
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Each rolled abaxially inward from the lateral margins. |
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laminar 2 |
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solid shape |
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Relatively very thin with parallel opposite broad faces, the whole plane or variously curved. Structures to which this term, along with any other three-dimensional ones, is applicable are often also described as though only two-dimensional, using terms that are implicitly understood to refer only to the outline of the broad faces. |
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anatropous |
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orientation |
ovule |
Having the funiculus distally recurved and the (straight) ovule lying beside and parallel to the proximal portion of the funiculus, to which it may be adnate or adherent, the micropyle facing the ovary wall (placenta). |
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calyculus 2 pl. calyculi |
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STRUCTURE |
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Collectively the bractlets (bracteoles) sometimes subtending (beneath or outside) the involucre in a capitulum (head); in Asteraceae (Compositae). |
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epibracteal |
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insertion |
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Upon the bracts, or partially adnate thereto and apparently arising therefrom. |
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rosette |
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STRUCTURE |
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A set of leaves that are strongly congested and disposed in radial symmetry about the main stem at or very near its base, seeming to arise at the same level and often overlapping laterally; esp. the overwintering leaves of perennial herbs. |
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legume |
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nominative |
fruit |
Dry, septicidal, one-loculed and derived from a single, superior, simple ovary; dehiscing along two sutures, one abaxial, one adaxial; in Fabaceae (Leguminosae). See also loment. |
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pollinarium pl. pollinaria |
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STRUCTURE |
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A pollinium together with, when present, its stipe and viscidium; the entire unit of pollinium dispersal. |
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lemma pl. lemmata, lemmas |
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STRUCTURE |
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The proximal bract of the (usually) two that immediately subtend the flower in a grass (Poaceae) floret; the other is the palea. |
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pollinial |
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arrangement |
pollen |
Polyadal with the grains of individual thecae (pollen sacs), or of fused thecae, compacted and forming tightly coherent masses (pollinia) that constitute the basic dispersal units, these sometimes distally attenuate to a sterile caudicle (translator arm), sometimes united by caudicles in groups of two or more, the caudicle(s) sometimes attached to a viscidium, either directly or through an intervening stipe; esp. in Asclepiadaceae, Orchidaceae. |
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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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obscure |
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manifestation |
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Hardly evident. |
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salt-excreting |
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exudation |
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Accumulating salt and discharging it directly to the exterior in a concentrated aqueous solution, the salt then crystallizing on the exterior following evaporation of the fluid medium; when salt-excreting glands are indicated in the nominative, usually they are called simply salt glands. |
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primocane |
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STRUCTURE |
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A biennial or perennial stem before it has begun flowering, when the latter does not occur until at least its second season of growth; esp. in Rubus (Rosaceae). |
