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tunic |
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STRUCTURE |
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A membranous covering outside the epidermis, especially around bulbs and corms, often becoming loose, sometimes scarious. |
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monochasiate |
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architecture |
inflorescence |
Comprising one or more simple or compound monochasia. See also cincinnate, cymose, cymulose, dichasiate, helicoid-cymose, scorpioid-cymose. |
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rhytidomal |
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insertion |
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Within, upon, or otherwise directly associated with the bark. |
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discal |
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position |
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Upon or otherwise directly associated with the floral disc. |
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basiscopic |
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orientation |
subordinate structure |
Directed, facing, or pointing ("looking") toward the base of the bearing structure. |
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irregular 2 |
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course |
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Deviating asymmetrically from a straight line. |
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elongate |
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plane shape |
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Longer in one dimension than in any other. |
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hypochilium |
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STRUCTURE |
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The proximal portion of a labellum (lip) that has distinct proximal, distal, and sometimes also central parts; in Orchidaceae. See also epichilium, mesochilium. |
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calyptra pl. calyptrae |
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STRUCTURE |
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A distal hood- or lid-like portion that detaches as a unit from the remainder of the structure; esp. in some Papaveraceae the unopened calyx that separates from the rest of the flower at anthesis. |
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geminicolpate |
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architecture |
pollen grain |
Having four or more surficial grooves (colpi) disposed in pairs. |
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induplicate |
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aestivation |
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Basically valvate but with each member involute, the lateral abaxial surfaces of adjacent members contiguous. |
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first glume |
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STRUCTURE |
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The lower (proximal) or sometimes solitary small bract inserted at the base of a grass (Poaceae) spikelet, the second glume, when present, inserted immediately above (distal to) it. |
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exindusiate |
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architecture |
sorus |
Lacking an indusium. |
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absent |
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presence |
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Not occurring within the context in point. |
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valvate 2 |
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arrangement |
planate structures |
Not overlapping, adjacent members laterally contiguous at their margins. |
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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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persistent |
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duration |
structure |
Remaining attached and conspicuous until the bearing structure reaches maturity. |
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fastigiate |
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arrangement |
branches |
Closely parallel to one another and to the axis of origin over most of their lengths. |
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pubescence |
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CHARACTER |
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Collective aspect of trichomes borne on the surface. Many of the terms traditionally used for describing pubescence have been defined and used in so many differing and often contradictory ways that they have become hopelessly ambiguous. This is attributable mainly to overdefinition within this portion of the traditional lexicon — that is, to highly arbitrary and widely variant restriction of a term's scope to some one detailed combination of trichome character states (shape, size, orientation, etc.). By derivation these are essentially general terms, really suited only for denoting overall aspect. The diversity actually encountered in nature defies comprehensive and unambiguous resolution into any limited suite of precisely specified, mutually exclusive, complex character states that can be associated with these terms, which are best used only in their general senses. Sometimes, such description will be sufficient in itself; more often, additionally or alternatively, the various attributes of the individual trichomes should be described. This is the only strategy that allows for full description of any possible condition, including the presence of more than one type of trichome. The various terms used for describing pubescence have never been semantically consistent; in some cases they refer to the trichomes themselves, while in others they apply to the bearing surface or structure; e.g., sericeous (the trichomes themselves are collectively silky) versus barbate (the structure is bearded). See also coating, indumentum (vesture). |
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syncolporate |
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architecture |
pollen grain |
Syncolpate, each groove containing a pore. |
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channel |
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FEATURE |
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A longitudinal, transversely rounded depression; esp. along the adaxial surface of a petiole or petiolule. |
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convolute 2 |
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arrangement |
cotyledons |
Each rolled or folded inward longitudinally, one enveloping the other. |
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septal |
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position |
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Upon or otherwise directly associated with the septum or septa. |
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obvolute 2 |
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vernation |
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Conduplicate with the lateral edges of each leaf alternately overlapping those of the oppositely oriented, distally next adjacent one. |
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cyme |
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nominative |
inflorescence |
Determinate and constituting a compound dichasium or monochasium, the flowers maturing from the center outward (i.e., the distal or inner flowers maturing first); often more or less flat-topped. See also cymule, dichasium, helicoid cyme, monochasium, rhipidium, scorpioid cyme. |
