haustorium pl. haustoria |
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STRUCTURE |
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An absorbing and anchoring organ, often root-like, excrescent from a vegetative part of a parasitic or hemiparasitic plant, by which the plant communicates intimately with and derives sustenance and support from its host plant, into whose tissues the haustorium intrudes. |
synanthous |
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maturation |
non-floral structure |
Maturing at the same time as the flowers. See also coetaneous. |
flanged |
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plane shape |
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Having a relatively broad circumferential rim or ridge that protrudes laterally. |
wiry |
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architecture |
axis |
Relatively very narrow and elongate, tough, and resiliently flexible. |
enation |
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STRUCTURE |
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A relatively small outgrowth from an otherwise regular boundary or surface of a larger structure. |
antipetalous |
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insertion |
equivalent floral structures |
Each inserted directly above or below a petal. In place of this term, the phrase "opposite the petals" is often used, but that contradicts the sense of opposite as otherwise employed (arrangement of lateral structures along an axis) and should be avoided. |
wall (fruit, ovary, pollen, spore) |
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STRUCTURE |
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The exterior layer of tissue(s) enclosing anatomically distinct interior tissues and sometimes fluid and/or one or more cavities. |
monochasium pl. monochasia |
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nominative |
inflorescence |
Determinate and falsely dichotomous with each axial segment bearing a single, sessile terminal flower; presumably derived from a dichasium by loss of the lateral flowers. See also cincinnus, cyme, cymule, dichasium, helicoid cyme, scorpioid cyme. |
peltate |
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architecture |
foliaceous structure |
Petiolate with the petiole attached to the abaxial face of the blade at some point within the margin and otherwise free from the blade. |
thyrse |
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nominative |
inflorescence |
An elongate, indeterminate main axis bearing numerous lateral branches, each the principal axis of a cymose subdivision. |
ternate |
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architecture |
foliaceous structure |
Palmate with three leaflets. |
epirhizal |
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insertion |
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Upon or arising from the roots. |
arcuate 1 |
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course |
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Curving more or less regularly in one direction. |
ostiole |
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STRUCTURE |
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The distal aperture of a syconium (fig); in Ficus (Moraceae). |
inferior 1 |
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insertion |
indusium |
Inserted at the base of the sorus. |
sterile |
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reproduction |
plant, reproductive structure |
Not producing functional spores, gametes, pollen, ovules, seeds, or other propagules. |
intravaginal |
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insertion |
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Within the leaf sheath. |
intravaginal |
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position |
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Within the leaf sheath. |
nodulose |
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solid shape |
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Diminutively nodose; esp. roots of Fabaceae (Leguminosae), the nodules harboring nitrogen-fixing bacteria. |
subpetiolar |
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insertion |
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Just below the point of petiole insertion. |
heterosporous |
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reproduction |
taxon |
Producing two types of spore, microspore and megaspore, which are sexually distinct and usually different in size, each megaspore giving rise to a megagametophyte, each microspore to a microgametophyte. |
chaff 1 |
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STRUCTURE |
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Collectively, the paleae (pales, palets) sometimes borne on the receptacle of a capitulum (head) in Asteraceae (Compositae). |
knee 2 |
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STRUCTURE |
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An emergent portion of an otherwise normally submerged secondary root of a wetland tree, resembling a bent human knee. |
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. |
ridge |
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FEATURE |
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A very narrow, elongate, relatively low protrusion; esp. on fruits in Apiaceae (Umbelliferae). |