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epidermal cell |
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STRUCTURE |
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Any of the unspecialized cells of an epidermis; i.e., any other than stomatal guard cells or cells directly associated with trichomes. While the latter specialized cells are also properly epidermal cells, they are treated separately for descriptive purposes and, for the sake of convenience, use of the general term is restricted to the unspecialized cells that constitute the bulk of an epidermis. |
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rhizoid |
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STRUCTURE |
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Any structure that is similar to a root in appearance and function but that is not a true root ontogenetically and anatomically, especially one produced from a gametophyte thallus. |
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staminode |
= staminodium |
STRUCTURE |
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Any sterile structure deemed to represent a modified stamen, homology being inferred on the basis of structural similarity, ontogeny, and/or position; sometimes petaloid, sometimes nectariferous, sometimes connate with others or adnate to other floral structures. |
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pistillode |
= pistillodium |
STRUCTURE |
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Any sterile structure deemed to represent a modified pistil, homology being inferred on the basis of structural similarity, ontogeny, and/or position; sometimes nectariferous, sometimes connate with others or adnate to other floral structures. |
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filament |
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STRUCTURE |
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The stalk, when present, of a stamen, clearly differentiated from and bearing at its summit an anther. |
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scape |
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STRUCTURE |
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A leafless, essentially naked, inflorescence-bearing stem (or peduncle) arising directly from a caudex or rhizome, its point of insertion slightly beneath, at, or slightly above the substrate surface. |
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pale 2 |
= palea, palet |
STRUCTURE |
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The upper or distal of the (usually) two distinctive bracts immediately subtending the flower in a grass (Poaceae) spikelet. |
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petal |
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STRUCTURE |
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One of the one or more constituent members of a corolla; colored and showy in many taxa, inconspicuous in size and/or color in others; may be distinct or else connate with one or more others, and/or may be free or else adnate to one or more other floral structures. |
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whorl |
= cycle, series, verticil |
STRUCTURE |
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A set of three or more lateral structures that are inserted around an axis at the same level. |
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tunic |
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STRUCTURE |
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A membranous covering outside the epidermis, especially around bulbs and corms, often becoming loose, sometimes scarious. |
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follicetum pl. folliceta |
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STRUCTURE |
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An aggregate of follicles produced from a single flower with multiple simple pistils. |
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jacket cell |
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STRUCTURE |
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Any of the cells forming the portion of an antheridial wall between the basal cells and the cap cell(s). |
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spine |
= thorn |
STRUCTURE |
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Any sharp, stiff, simple or branched, woody appendage having vascular tissues confluent with those of the bearing structure. "Spine" is often preferred when the appendage is homologous with a leaf or stipule, and "thorn" when it is homologous with a branch. See also prickle. |
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rostrum 1 pl. rostra |
= beak |
STRUCTURE |
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A relatively long, tapering, more or less rigid and pointed enation or termination. |
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flesh |
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STRUCTURE |
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Tissue that is fairly firm and dense, juicy or at least moist, and easily cut. |
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dissepiment |
< septum; > replum |
STRUCTURE |
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A wall or partition between adjacent locules of an ovary or fruit. |
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caudicle |
= translator arm |
STRUCTURE |
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An attenuate end portion by which a pollinium adheres to a pollinating insect, either directly or by means of a terminal viscidium, the latter, when present, sometimes attached by an intervening stipe; esp. in Asclepiadaceae, Orchidaceae. |
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membrane |
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STRUCTURE |
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A relatively thin layer of tissue that covers or separates other, different tissue(s) and/or empty space(s). |
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epidermis pl. epidermides, epidermises |
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STRUCTURE |
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The anatomically distinct, outermost, living tissue that encloses and protects the other tissues of a plant organ or part, usually overlaid by an exuded waxy cuticle; resulting from primary growth, disrupted and shed as a consequence of secondary growth if that occurs; consisting mainly of cells not further specialized, otherwise including various types of more specialized cells associated with trichomes and stomates. |
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pistillodium pl. pistillodia |
= pistillode |
STRUCTURE |
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Any sterile structure deemed to represent a modified pistil, homology being inferred on the basis of structural similarity, ontogeny, and/or position; sometimes nectariferous, sometimes connate with others or adnate to other floral structures. |
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toothlet |
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STRUCTURE |
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A diminutive tooth (dens). See also sawtooth, sawtoothlet, scallop (crena), scalloplet (crenule). |
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palea 1 pl. paleae, paleas |
= pale, palet, receptacular bract |
STRUCTURE |
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A small papery (chartaceous) to membranous bract borne on the compound receptacle (torus) of a capitulum (head) in Asteraceae (Compositae). |
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squama pl. squamae |
= lepis; < scale, trichome |
STRUCTURE |
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A relatively thick, planate trichome. See also squamella (squamule). |
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series |
= cycle, verticil, whorl |
STRUCTURE |
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A set of three or more lateral structures that are inserted around an axis at the same level. |
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joint |
= articulation |
STRUCTURE |
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A distinct, relatively narrow zone of demarcation between adjacent main portions of an elongate structure, often thicker than the rest of the structure and sometimes a site of eventual abscission. |
