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torus 1 pl. tori |
= receptacle |
STRUCTURE |
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The relatively short, simple, axial structure surmounting a pedicel and basal to the flower, usually broader than the pedicel. |
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bud scale |
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STRUCTURE |
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A scale that, alone or aggregated with others, envelops and protects a bud. |
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radix pl. radices |
= root |
STRUCTURE |
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A vascularized axis that is not internally differentiated into nodes and internodes and that branches endogenously, serving for anchorage, absorption and/or storage; collectively, all those portions of a plant body not belonging (anatomically) to the shoot. See also adventitious root, climbing root, diffuse root, knee root, primary root, prop root, secondary root, stilt root. |
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sawtoothlet |
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STRUCTURE |
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A diminutive sawtooth. See also scallop (crena), scalloplet (crenule), tooth (dens), toothlet. |
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antheridium pl. antheridia |
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STRUCTURE |
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A male gametangium; a multicellular fertile organ of a mature gametophyte within which male gametes (antherozoids, spermatozoids) are produced and from which they are discharged, in some taxa forcibly, through a pore. Technically present but highly reduced and of no descriptive significance in Magnoliophyta and part of Pinophyta. |
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beard |
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STRUCTURE |
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A growth of relatively long, erect, flexible, capillary trichomes from one or more limited sectors of a structure's surface. |
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carpel |
< macrosporophyll (not recommended), megasporophyll, pistil |
STRUCTURE |
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A more or less abstract unit of floral structure conceptually equivalent to a simple pistil or its putative evolutionary precursor (megasporophyll) or derivative (constituent of compound pistil); often regarded as the basic evolutionary unit of the gynoecium. |
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pinnule |
< leaflet |
STRUCTURE |
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A second- or higher-order division or leaflet of a pinnate frond; a division of a pinna; in Polypodiophyta. |
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labellum pl. labella |
< labium, lip |
STRUCTURE |
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The third petal of a tripetalous flower when distinctively different from the other two, usually enlarged relative to them and/or differently shaped or colored, usually apparently the abaxial (lower) petal of the three due to resupination during ontogenesis; esp. in Orchidaceae. |
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sporophyll |
= spore leaf; > fertile frond |
STRUCTURE |
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A leaf or homologous structure that bears sporangia. See also megasporophyll (macrosporophyll, not recommended), microsporophyll. |
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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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torus 2 pl. tori |
= receptacle |
STRUCTURE |
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The short, expanded, compound axial structure surmounting a peduncle and basal to two or more flowers, or to the florets of a capitulum (head) in Asteraceae (Compositae), where it may bear paleae (receptacular bracts), scales, bristles, trichomes, or subulate enations, and may be smooth or variously pitted (alveolate, foveolate). |
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pedicel |
< stalk |
STRUCTURE |
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The stalk, when present, of a single flower, except when the flower is solitary and deemed to represent an evolutionarily reduced compound inflorescence borne directly upon a peduncle. |
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cotyledon |
= seed leaf |
STRUCTURE |
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Any of the one or more primary foliar structures of an embryonic seed plant, proximal to all succeeding leaf primordia; sometimes serving as a storage organ for food reserves in the seed, as in peas and beans. |
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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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stylopodium pl. stylopodia |
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STRUCTURE |
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A discoid enlargement at the base of the styles; esp. in Apiaceae (Umbelliferae). |
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thallus 1 pl. thalli |
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STRUCTURE |
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The vegetative portion of a shoot when not differentiated into stem and leaves; esp. in Lemnaceae. |
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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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stipule |
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STRUCTURE |
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Any distinct, relatively diminutive, more or less foliaceous structure inserted on a stem alongside a petiole, or on a petiole near its base, and ontogenetically closely associated with the leaf; usually occurring as one of a pair disposed one to either side of the petiole. |
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pistil |
> carpel |
STRUCTURE |
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Any simple or compound, discrete or histologically distinct, female (ovule-producing) floral structure, or any putatively homologous sterile structure; comprising an ovary and one or more stigmas borne either directly upon the ovary or upon one or more intervening styles. See also gynoecium. |
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androecial tube |
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STRUCTURE |
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The tubular portion of an androecium in which the component structures have fused with one another laterally over part or all their lengths. |
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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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trabecula pl. trabeculae |
< septum |
STRUCTURE |
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A transverse wall or partition that fully or partially separates two chambers within a sporangium. |
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bulb |
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STRUCTURE |
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A thickened underground perennating structure consisting of a stem with numerous closely proximate nodes bearing many tightly imbricate, thickened, often fleshy, foliaceous organs containing large amounts of stored food, usually in the form of starch; the whole usually enveloped and protected by imbricated scarious or fibrous foliaceous organs. |
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disc 1 var. disk |
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STRUCTURE |
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Any distinct, annular to discoid structure produced from or borne upon a floral receptacle between or basal to any of the sets of floral organs; usually fleshy, often nectariferous. |
