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pappus pl. pappi |
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STRUCTURE |
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A set of one or more awns (aristae, bristles, setae) or scales at the summit of an inferior ovary just beneath or outside the free portion of the corolla; persisting in the fruit (cypsela) and often aiding wind or animal dispersal; in Asteraceae (Compositae). Considered by some to be an evolutionarily modified upper calyx portion, the lower portion having been incorporated into the floral tube casing adnate to the ovary wall; considered by others to be an outgrowth from the ovary wall. |
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persistent |
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duration |
structure |
Remaining attached and conspicuous until the bearing structure reaches maturity. |
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vascular |
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insertion |
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Upon or otherwise directly associated with the vasculature. |
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zygomorphic |
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architecture |
perianth, calyx, corolla |
Bilaterally symmetric; divisible into two essentially equal portions along only one median logitudinal plane. |
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gynaecium |
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STRUCTURE |
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See gynoecium. |
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resupinate |
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orientation |
lateral structure |
Inverted due to twisting distal to the point of insertion during development. |
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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. |
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rugulose |
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relief |
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Slightly or finely rugose (corrugate, wrinkled). |
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anthelate |
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architecture |
inflorescence |
Comprising one or more anthelae; esp. in Juncaceae. |
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hysteranthous |
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maturation |
non-floral structure, esp. leaf |
Maturing later than the flowers. |
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ringed |
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relief |
bark |
Fissured, mainly horizontally, with at least some of the fissures individually encircling the stem more or less completely. |
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canalicular |
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insertion |
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Upon or otherwise directly associated with the channel of a petiole or petiolule. |
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intricate |
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arrangement |
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Entangled; irregularly intertwined and not readily disentangled. |
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infrabracteal |
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insertion |
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Upon the axis directly below a bract insertion. |
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basicauliramous |
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architecture |
plant |
Having the stem(s) branching at or near the base. See also basiramous. |
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laminar 1 |
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insertion |
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Upon or otherwise directly associated with the lamina (blade) of a foliaceous structure. |
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axil |
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FEATURE |
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The space bounded by and near the vertex of the distal angle between a lateral structure, especially a leaf, and the axis that bears it. |
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coating |
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CHARACTER |
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Exudate that covers the surface proper. See also indumentum (vesture), pubescence. |
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knee root |
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STRUCTURE |
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A specialized secondary root of a wetland tree, a portion of which projects above mean water level and appears to bend as a leg does at the knee, its distalmost portion being anchored in the substrate beneath the water. The knee of the root is commonly regarded as a conduit for gas exchange between root interior and atmosphere, a function whose need is posited on the basis of the highly anaerobic and saturated conditions prevailing in wetland substrates. |
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circumscissile |
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dehiscence |
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Splitting transversely through the exterior wall about its entire circumference, the resulting upper cap-like portion falling away. |
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liguliflorous |
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architecture |
capitulum (head) |
Bearing florets that all are bisexual and have zygomorphic corollas; in Asteraceae (Compositae). |
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adventitious |
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derivation |
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Arising more or less unpredictably from an organ, tissue, or site that is an unusual, abnormal, or atypical origin for structures of its type. |
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sinuous |
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course |
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Regularly wavy in one plane, curved alternately and more or less regularly to either side. |
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birettaform |
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solid shape |
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Approximately square in cross section and shallowly convex at the top; like a biretta (Roman Catholic cleric's hat). |
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continuous 3 |
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architecture |
rachilla, rachis |
Not disarticulating at maturity. |
