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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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apiculate |
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apex |
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Terminating abruptly in a short, slender, angular tip that is not notably harder or stiffer than the main body of the structure. See also mucronate, mucronulate. |
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spirolobal |
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arrangement |
cotyledons |
Incumbent and folded together transversely. |
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exsert(ed) |
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position |
anther, style |
Protruding beyond the floral envelope. See also included. |
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tetrad |
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STRUCTURE |
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A group of four pollen grains originating from a single pollen mother cell. |
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polycarpic |
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reproduction |
plant |
Normally fruiting repeatedly prior to senescence. |
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saprophytic |
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nutrition |
plant |
Heterotrophic and obtaining essential nourishment directly from the decomposing remains of other organisms. |
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hemiepiphytic |
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habit |
plant |
Partially epiphytic; rooted in the ground but with stems growing upon and supported mainly by other plants. |
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deltate |
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plane shape |
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Equilaterally triangular, broadest at the base, and regularly attenuate to an angular apex. See also obdeltate. |
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prolate |
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solid shape |
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Symmetrically elongate parallel to the developmental or polar axis. |
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homogamous 1 |
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maturation |
bisexual flower |
Having the androecium and gynoecium become functionally mature concurrently. |
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diffuse-porous |
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porosity |
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Homogeneously porous, the vessels not differentially disposed by size or number. |
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prop root |
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STRUCTURE |
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A relatively stout adventitious root arising from the lower portion of a main stem and extending outward and downward toward the substrate, within which it ultimately becomes anchored, thus buttressing the aboveground portion of the plant. |
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abortive |
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maturation |
spore, pollen, seed |
Never attaining functional maturity due to defective or arrested development. |
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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. |
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palinactinodromous |
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venation |
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Compound actinodromous, with higher-order branch radiations above the level of and similar to the primary one. |
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sellaeform |
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solid shape |
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See selliform. |
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twig |
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STRUCTURE |
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The terminal portion of an ultimate branch of a woody stem, representing the most recent increment of growth and bearing or having borne the current or most recent increment of leaves. See also branchlet. |
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hyponastic |
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development |
laminar structure |
Having the abaxial surface differentiating and growing faster than the adaxial surface, thus, until maturity, development of the former more advanced than the latter at any given time and the structure as a whole involute or incurved. |
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foliar |
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insertion |
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Upon or otherwise directly associated with the leaves. |
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branch |
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STRUCTURE |
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Any higher-order division of or outgrowth from an axis, vein or veinlet when such division or outgrowth is equivalent in nature to the structure of origin. |
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inflexed |
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orientation |
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Bent adaxially at some point along its length. |
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radiant 1 |
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architecture |
capitulum (head) |
Bearing one or more peripheral series of florets that are bisexual, pistillate, or neuter and that have relatively large actinomorphic corollas, and one or more central series of usually bisexual florets that have relatively small actinomorphic corollas; in Asteraceae (Compositae). |
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full |
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extent |
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Reaching from the ovary wall or pericarp to the center of the ovary or fruit and from the apex to the base of its interior, thus separating adjacent locules completely. |
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perfect |
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architecture |
flower |
Having functional pistil(s) and functional stamen(s) both present, thus bisexual (hermaphroditic). |
