NCBG North Carolina Botanical Garden

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Botanical Glossary

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TetragonalFour-angled
TetrahedralHaving the form of a tetrahedron
TetralocularFour-locular
TetramerousWhorl with four members
TetrandrousWith four stamens
TetrastichousLeaves or other structures in four rows
ThecaOne half of anther containing two pollen sacs or male sporangia
ThornA woody, sharp-pointed, modified stem. (Compare with prickle and spine.)g-thorn.png
thornyBearing thorns.g-thorn.png
ThreatenedA species likely to become endangered within the foreseeable future throughout all or a significant ...
Three-angledMore or less triangular-shaped in cross section.
Three-rankedWith leaves arranged in along the stem in three rows. (Compare with distichous and four-ranked.)
ThroatAn open, expanded tube in the perianth
ThyrseAn elongate, many-flowered inflorescence with an indeterminate main axis or rachis and numerous late...g-thyrse.png
TillerA grass shoot produced from the base of the stemg-tiller.png
TomentoseWith tangled woolly hairs.g-tomentose.png
ToroseCylindrical with contractions at intervals
TortuousIrregularly twistedg-tortuous.png
TorusThe region at end of pedicel or on axis to which flower is attached.
Trace ScarA mark indicating former place of attachment within the leaf scar of the vascular bundle or trace.
TrailingSprawling on ground, usually with adventitious roots
TranspirationThe process in which plants give off excess water into the atmosphere in the form of water vapor.
TransverseDehiscing at rightangles to long axis of theca.g-transverse.png
TreeA relatively tall, woody, perennial plant usually with a single stem (trunk) that bears branches. (C...
TriangularWith three sides and three angles
TricarpellateThree-carpellate
TrichomeAny type of plant hair (except for root hairs).
TricyclicThree-whorled
TridynamousWith stamens in two equal groups of three
TrifidCut or divided into three lobes or parts
TriflorousThree-flowered
TrifoliateHaving three leaves or three leaflets.
TrifoliolateCompound with three leaflets; three-leafleted or ternate. (Compare with bifoliolate, biternate and t...g-trifoliolate.png
TrifurcateDivided into three forks or branches; three-forked
TrigonousThree-angled
TriheteranthousHaving different states in three different sets of flowers, only one state present in each set
TriheterophytousHaving different states in three different sets of plants, only one state present in each set
TrileteBasically tetrahedral, but often appearing round or triangular, with three scar lines forming a Y.
Trilete SporeBasically tetrahedral, but often appearing round or triangular, with three scar lines forming a Y
TrimerousWhorl with three members
TrimorphicHaving three different shapes and/or sizes within the same species
TrioeciousPlants staminate, pistillate or perfect
Tripalmately compoundWith three orders of leaflets, each palmately compound; three-times palmately compound. (Compare wit...g-tripalmate.png
Tripinnate-pinnatifidThree times pinnately compound with pinnatifid leaflets. (Compare with bipinnate-pinnatifid and once...
Tripinnately compoundWith three orders of leaflets, each pinnately compound; three-times pinnately compound. (Compare wit...g-tripinnate.png
Tripinnately lobedWith three orders of leaf lobing, each pinnately lobed; three-times pinnately lobed. (Compare with b...g-tripinnate.png
TriquetrousThree-angled with the sides usually concave
TristichousLeaves or other structures in three rows
TriternateWith three orders of leaflets, each divided into threes or ternately compound; three-times trifoliol...g-triternate.png
True indusiumAn epidermal outgrowth protecting the sorus.g-indusium.png
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