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pollinium pl. pollinia |
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STRUCTURE |
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A mass of coherent pollen grains disseminated as a unit by adhering to a pollinating insect, representing the entire content of a single theca or of fused thecae; often distally attenuate to a sterile caudicle (translator arm), which may attach to a viscidium, either directly or through an intervening stipe; esp. in Asclepiadaceae, Orchidaceae. |
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infructescence 1 |
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STRUCTURE |
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A mature (fruiting) inflorescence (static sense). |
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seed |
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STRUCTURE |
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A mature or ripened ovule containing an embryonic sporophyte and a nutritive tissue (endosperm or perisperm) with stored food that sustains the initial growth of the embryo upon germination, except when such food reserve is stored instead in the cotyledon(s) of the embryo itself, these enclosed by one or two integuments (the testa), the whole serving as a propagule. A fertile seed (one containing a viable embryo) normally results from sexual fertilization of an egg by a sperm; however, fertile seeds are sometimes produced asexually by apomictic processes (e.g., parthenogenesis). |
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velum pl. vela |
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STRUCTURE |
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A membranous adaxial flap or fold of vegetative tissue wholly or partly covering the sporangial cavity of a sporophyll; in Isoëtaceae. |
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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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latex pl. latices, latexes |
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SUBSTANCE |
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A moderately viscous and sticky exudate, often milky, sometimes otherwise colored or clear. Overlaps conceptually with gum. |
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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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husk |
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STRUCTURE |
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A more or less dry, hard or fibrous, simple or compound enclosure or outer layer of a seed, fruit or inflorescence. |
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cilium 2 pl. cilia |
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STRUCTURE |
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A motile hair- or whip-like structure extending from the surface of a cell. |
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antherozoid |
= spermatozoid; < sperm |
STRUCTURE |
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A motile male gamete, produced within an antheridium. |
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spermatozoid |
= antherozoid; < sperm |
STRUCTURE |
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A motile male gamete, produced within an antheridium. |
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spore body |
= sporocarp |
STRUCTURE |
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A multicellular structure that bears and more or less encloses several to (usually) many sporangia, the latter often aggregated into sori within it See also megasporocarp (macrosporocarp, not recommended), microsporocarp. |
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sporocarp |
= spore body |
STRUCTURE |
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A multicellular structure that bears and more or less encloses several to (usually) many sporangia, the latter often aggregated into sori within it See also megasporocarp (macrosporocarp, not recommended), microsporocarp. |
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nectary |
< gland |
STRUCTURE |
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A multicellular, anatomically distinct structure that produces and exudes nectar. |
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hydathode |
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STRUCTURE |
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A multicellular, anatomically distinctive structure located within a leaf at its periphery, its cells surrounding a central canal that opens to the exterior, through which water is actively discharged under humid conditions that impede the rate of transpiration; this liquid discharge is termed guttation. |
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style |
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STRUCTURE |
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A narrow, usually elongate, ontogenetically distal portion of a simple or compound pistil, overtopping the ovary and bearing one or more stigmas; arising from the summit of the ovary, but sometimes apparently from its base at maturity to ontogenetic displacement from its primordial distal position. In a compound pistil the various simple (carpellary) components of the style(s) may not be connate over their entire lengths; the pistil is then regarded as having a branched style or styles. |
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isthmus |
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STRUCTURE |
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A narrower portion connecting two wider or broader portions of an inclusive structure. |
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mamilla pl. mamillae |
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STRUCTURE |
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A nipple- or teat-shaped protrusion. |
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acorn |
= glans |
nominative |
fruit |
A nut subtended by a persistent, hard, cap-like involucre of numerous, coherent, imbricate bracts; esp. in Fagaceae. |
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glans pl. glandes |
= acorn |
nominative |
fruit |
A nut subtended by a persistent, hard, cap-like involucre of numerous, coherent, imbricate bracts; esp. in Fagaceae. |
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dyad |
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STRUCTURE |
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A pair of coherent pollen grains shed as a unit. |
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pappus scale |
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STRUCTURE |
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A pappus element that is more or less planate and relatively thin and broad; may terminate in one or more awn- or bristle-like appendages. |
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perigynium 2 pl. perigynia |
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STRUCTURE |
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A phyllary (involucral bract) or palea (pale, palet) that fully encloses a cypsela; in Asteraceae (Compositae). |
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pitcher |
= ascidium, pitcher blade |
STRUCTURE |
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A pitcher-shaped (ascidiform) leaf blade, sometimes lidded (operculate), usually carnivorous; esp. in Nepenthaceae, Sarraceniaceae. |
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pitcher-blade |
= ascidium, pitcher |
STRUCTURE |
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A pitcher-shaped (ascidiform) leaf blade, sometimes lidded (operculate), usually carnivorous; esp. in Nepenthaceae, Sarraceniaceae. |
