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testa pl. testae |
= seed coat |
STRUCTURE |
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The outer protective layer of a seed, developed from the ovular integument(s). |
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testes-shaped |
= testicular |
solid shape |
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Bilaterally symmetrical, each side essentially oblate and constrictedly confluent with the other; like the overall shape of a pair of mammalian testes. |
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testicular |
= testes-shaped |
solid shape |
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Bilaterally symmetrical, each side essentially oblate and constrictedly confluent with the other; like the overall shape of a pair of mammalian testes. |
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tetra… |
= four-…, quadr(i)… |
prefix |
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Indicating presence of or constitution by four entities of the type denoted by the term's stem; as in tetrandrous, tetracarpellate, tetracolporate. See also individual entries for terms with this prefix whose meanings, at least in some applications, are more specific than usually indicated by such combination. |
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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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tetrad scar |
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FEATURE |
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A surficial ridge or angle resulting from coherence with other spores produced from the same mother cell. |
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tetradal |
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arrangement |
pollen |
Shed in groups of four, each an intact tetrad with original configuration unchanged; geometric arrangement of the grains may be tetrahedral, tetragonal, or linear, depending upon mode of pollen mother cell division. |
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tetradynamous |
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architecture |
flower, androecium |
Diadelphous with four stamens in one set and two in the other. See also didynamous. |
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texture |
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CHARACTER |
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Substantial properties. Overlaps conceptually with solid shape, as to thickness. |
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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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thallus 2 pl. thalli |
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STRUCTURE |
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The main body of a gametophyte, bearing rhizoids, gametangia (antheridia and/or archegonia), and/or gemmae cups; usually thin and more or less planate, inconspicuous, and growing appressed to or beneath the substrate surface; in Psilotophyta, Lycopodiophyta, Equisetophyta, Polypodiophyta. See also prothallus. |
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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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thermocleistogamous |
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reproduction |
flower |
Normally chasmogamous but facultatively cleistogamous during periods of lower-than-normal temperature. |
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tholiform |
= dome-shaped |
solid shape |
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Convex overall, broadest at the base, and transversely more or less circular to elliptical throughout. |
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thorn |
= spine |
STRUCTURE |
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Any sharp, stiff, simple or branched, woody appendage having vascular tissues confluent with those of the bearing structure. "Spine" is often preferred when the appendage is homologous with a leaf or stipule, and "thorn" when it is homologous with a branch. See also prickle. |
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thread-like |
= filiform |
solid shape |
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Elongate and very slender, basically round in transverse section and of more or less uniform diameter, variously curved over its length or not. See also hair-like (capillary, capillate). |
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three-… |
= tri… |
prefix |
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Indicating presence of or constitution by three entities of the type denoted by the term's stem; as in three-cleft, three-flowered, three-ranked. See also thrice… (tri…, triple…). |
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thrice-… |
= tri…, triple-… |
prefix |
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Indicating presence of three hierarchical orders of the type of entity or pattern denoted by the term's stem; as in thrice-pinnate. See also three-… (tri…). |
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throat 1 |
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STRUCTURE |
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The far distal portion of a perianth, calyx, or corolla tube, or of a leaf sheath, surrounding the orifice of the tube or sheath, sometimes constricted relative to the diameter of the main body of the tube or sheath; except in disc florets of Asteraceae (Compositae). |
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throat 2 |
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STRUCTURE |
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The fully connate portion of the limb of a disc floret, proximal to the lobes (distinct distal portions of the petals); in Asteraceae (Compositae). |
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thyrsate |
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architecture |
inflorescence |
Comprising one or more thyrses. |
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thyrse |
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nominative |
inflorescence |
An elongate, indeterminate main axis bearing numerous lateral branches, each the principal axis of a cymose subdivision. |
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thyrse-like |
= thyrsiform |
architecture |
capitulescence, inflorescence |
Resembling a thyrse, but not strictly such. |
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thyrsiform |
= thyrse-like |
architecture |
capitulescence, inflorescence |
Resembling a thyrse, but not strictly such. |
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tiered |
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arrangement |
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In two or more rows that are arrayed one above another. |