mamilla pl. mamillae |
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STRUCTURE |
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A nipple- or teat-shaped protrusion. |
gemma pl. gemmae |
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STRUCTURE |
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A vegetative propagule by which a gametophyte reproduces asexually; produced by a process analogous to budding, from a more or less cupulate specialized area (gemmae cup) on the surface of the plant body (thallus); in Psilotophyta, Lycopodiophyta, Equisetophyta, Polypodiophyta. |
barb 2 |
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STRUCTURE |
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A trichome terminated by one or two small, relatively short, stiff, sharp, acutely reflexed appendages. |
bract 1 (broad sense) |
> bracteole, bractlet, phyllary, prophyll(um); >< scale |
STRUCTURE |
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Any lateral structure ontogenetically and anatomically analogous with, and therefore presumably homologous with, but relatively smaller than, a leaf, especially when subtending an inflorescence, other reproductive structure, or portion thereof; putatively, an evolutionarily reduced leaf. |
sterigma pl. sterigmata |
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STRUCTURE |
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A portion of a lamina that is prolonged and adherent to the supporting axis beneath the point of vascular insertion. |
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. |
embryo sac |
< megagametophyte |
STRUCTURE |
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The multinucleate generative cell of an ovule, within which fertilization and zygote formation occur; resulting from meiotic division of a megaspore mother cell within the nucellus, and thus genetically haploid; its contents generally considered to represent an evolutionarily reduced gametophyte. |
embryotega pl. embryotegae, embryotegas |
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STRUCTURE |
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A small, hardened, lid-like portion of the testa (seed coat) at the micropyle of some seeds, detaching at germination. |
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. |
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). |
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. |
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. |
spathe |
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STRUCTURE |
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A usually relatively large, sometimes showy, foliose bract subtending and sometimes partially enclosing an inflorescence, esp. a spadicate one; in Liliidae (monocotyledons). |
vexillum pl. vexilla |
= banner, standard |
STRUCTURE |
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The relatively large, erect adaxial (upper) petal in a papilionaceous corolla. |
flagellum pl. flagella |
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STRUCTURE |
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A very slender whip-like structure that extends from the main body of an antherozoid and, by active undulation, propels the cell through a liquid medium. |
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). |
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. |
cap cell |
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STRUCTURE |
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The single cell, or one of the several cells, forming the uppermost (distal) portion of an antheridial wall. |
valve |
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STRUCTURE |
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Any longitudinal segment of a fruit wall delimited by lines of dehiscence. |
fertile frond |
< spore leaf, sporophyll |
STRUCTURE |
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A frond that bears sporangia; in Polypodiophyta. See also sterile frond (trophophyll). |
bract 2 (strict sense) |
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STRUCTURE |
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Any primary or first-order lateral structure ontogenetically and anatomically analogous with, and therefore presumably homologous with, but relatively smaller than, a leaf, especially when subtending an inflorescence, other reproductive structure, or portion thereof; putatively, an evolutionarily reduced leaf. |
runner |
= stolon |
STRUCTURE |
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A slender stem that grows horizontally upon or just beneath the ground surface, rooting at the nodes and giving rise to erect shoot segments at some nodes and/or at its apex. |
pseudolamina pl. pseudolaminae |
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STRUCTURE |
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The expanded part of a phyllode (phyllodium), resembling a blade but evolutionarily derived from the petiole. |
lid |
= operculum |
STRUCTURE |
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A distal, cover-like portion of a structure whose main body is otherwise closed, transversely discontinuous with the main body around most of the circumference, or becoming partially or wholly separate by transverse dehiscence; as of a pitcher (ascidium), pollen grain, pyxis, or spore case (sporangium). |
wing 1 |
= ala |
STRUCTURE |
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Any elongate, relatively thin protrusion or appendage. |