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short-shoot |
= spur |
STRUCTURE |
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A first- or higher-order woody stem branch having relatively unelongated internodes, thus proximate nodes, and limited duration of growth, usually branching little if at all; often a main locus of flower production; usually more or less perpendicular to the axis that bears it and resembling a spur projecting from it; sometimes becoming more or less spinose after elongation ceases; esp. in Rosaceae. |
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phyllodium pl. phyllodia |
= phyllode |
STRUCTURE |
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A leaf deemed to consist entirely or almost entirely of tissues evolutionarily derived from the petiole, all or a distal portion of which has become laminar, the original blade reduced to the point of absence or vestigiality. |
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bulbel |
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STRUCTURE |
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A comparatively small bulb branching laterally from a larger, currently primary one. |
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archegonium pl. archegonia |
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STRUCTURE |
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A female gametangium; a multicellular fertile organ of a mature gametophyte within which female gametes (eggs, ova) are produced and fertilized; having a broad, bulbous base and a narrower distal neck. Technically present but highly reduced and of no descriptive significance in Magnoliophyta. |
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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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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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stone |
= pyrene |
STRUCTURE |
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The hard inner portion of a drupe, consisting of osseous endocarp and included seed. |
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spicule |
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STRUCTURE |
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A small, fine, stiff, acute protrusion that resembles a little spike. |
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gynaecium |
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STRUCTURE |
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See gynoecium. |
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theca pl. thecae |
= pollen sac |
STRUCTURE |
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Any of the one, two or four ontogenetically distinct, pollen-producing sectors (microsporangia) of an anther. In some taxa the walls between pairs of adjacent thecae break down as an anther approaches maturity, the mature anther thus ultimately containing half as many locules as thecae. |
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rostrum 2 pl. rostra |
= beak |
STRUCTURE |
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The inner, horn-like segment of a coronal lobe; esp. in Asclepiadaceae. |
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calyx pl. calyces |
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STRUCTURE |
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Collectively, the sepals of a flower, whether distinct or connate; the outer or proximal envelope of a differentiated perianth, whether the other envelope (corolla) is also actually present or is deemed to be secondarily absent due to evolutionary reduction. |
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ligule 3 |
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STRUCTURE |
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A relatively small, attenuate, membranous, laminar enation from the adaxial surface of a leaf near its base; in Selaginella, Isoetes. |
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pseudobulb |
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STRUCTURE |
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An enlarged internode of an aboveground stem, storing water and photosynthate, resembling a bulb; esp. in Orchidaceae. |
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rhizome |
= rootstock |
STRUCTURE |
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An underground, usually horizontal stem, often superficially resembling a root but easily distinguished by the presence of nodes, from which it branches exogenously to produce the aboveground portion(s) of the shoot. |
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enation |
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STRUCTURE |
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A relatively small outgrowth from an otherwise regular boundary or surface of a larger structure. |
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corolla tube 2 |
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STRUCTURE |
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The portion of the corolla of a bisexual or staminate disc floret proximal to the level of filament insertion; in Asteraceae (Compositae). |
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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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phyllopodium pl. phyllopodia |
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STRUCTURE |
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A stem-like axis composed of fused leaf bases; esp. in Arecaceae (Palmae), Musaceae. |
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bulbil |
= bulblet |
STRUCTURE |
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A small bulb-like structure produced from a sterile or fertile plant structure other than a bulb, usually within a leaf axil, leaf sinus, or inflorescence, serving as a vegetative propagule. |
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floral cup 1 (broad sense) |
= floral tube, hypanthium (broad sense) |
STRUCTURE |
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A complex structure comprising fused portions of the perianth and/or androecium of a flower, sometimes also including receptacular tissue; surrounding and wholly, partly, or not at all adnate to the gynoecium; subdivided morphologically into casing, collar and/or neck; sometimes bearing free distal portions of the constituent structures. |
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lodicule |
= squamella |
STRUCTURE |
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One of two or three small, scale-like structures inserted at the base of the androecium, distal to the palea, in most grass (Poaceae) flowers; often regarded as a vestigial branch or perianth member. |
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perianth |
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STRUCTURE |
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Collectively, all the sterile, primary, lateral organs (tepals, or sepals and/or petals) of a flower; inserted upon the floral axis immediately beneath (proximal to) the reproductive organs (androecium and/or gynoecium) and surrounding them, often protectively; lacking in some taxa; the individual members typically laminar and more or less foliaceous; widely regarded as consisting of the evolutionarily modified leaves of a fertile shoot; the constituent members undifferentiated with respect to one another, or else differentiated into more or less distinct floral envelopes (calyx and corolla), one or the other of which is deemed lacking in some taxa due to evolutionary reduction following differentiation. |
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gynandrium pl. gynandria |
= column, gynostemium |
STRUCTURE |
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A central floral structure consisting of the partly to wholly fused (connate and adnate) androecium and gynoecium; esp. in Orchidaceae. |
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cupule |
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STRUCTURE |
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A cup-like structure inserted at the base of a fruit, partially enclosing it or not; composed of a persistent, usually dried, sometimes hardened involucre, perianth, or portion thereof, the constituent parts often coalescent, yielding a unitary structure. |
