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spathulate |
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plane shape |
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See spatula-shaped, spatulate. |
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sinus pl. sinus, sinuses |
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FEATURE |
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The space, indentation, or invagination (or, for some descriptive purposes, the outline thereof) between and delimiting any two consecutive or adjacent lobes or teeth of a structure. |
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meniscoid |
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solid shape |
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Relatively thin with opposite, round, broad faces, one convex and one concave (as viewed externally), the circumferential edge angular or rounded; like a meniscus. See also discoid (disciform), lenticular (biconvex, lens-shaped), patelliform (kneecap-shaped). |
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barbed 2 |
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solid shape |
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Having one or more relatively short, stiff, acutely inserted or bent, antrorse or retrorse, terminal and/or lateral hook-like appendages; esp. awns or setae. |
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spirolobal |
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arrangement |
cotyledons |
Incumbent and folded together transversely. |
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dichasium pl. dichasia |
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nominative |
inflorescence |
Determinate and falsely dichotomous with each axial segment bearing a sessile terminal flower and either a pair of opposite pedicellate lateral flowers or a pair of opposite lateral branches. See also cincinnus, cyme, cymule, helicoid cyme, monochasium, scorpioid cyme. |
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monolete |
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architecture |
spore |
Having a single linear tetrad scar (surficial ridge or angle resulting from ontogenetic coherence with others produced from the same spore mother cell). |
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obscure |
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manifestation |
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Hardly evident. |
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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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palate |
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STRUCTURE |
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The lower, prominent labium (lip) of a personate (gaping, ringent) corolla. |
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enzymatic |
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exudation |
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Secreting a digestive exoenzyme; in carnivorous plants. |
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tortuous |
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course |
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Strongly irregular with sharp bends and/or curves. |
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extravaginal |
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position |
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Distal to or outside the leaf sheath. |
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pappus scale |
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STRUCTURE |
|
A pappus element that is more or less planate and relatively thin and broad; may terminate in one or more awn- or bristle-like appendages. |
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unequal |
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size |
equivalent structures |
Distinctly differing in extent. See also equal, subequal. |
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vestiture |
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STRUCTURE / SUBSTANCE |
|
See vesture. |
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gametophyte |
|
PLANT |
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The main, ultimate, gamete-bearing stage in the haploid (n chromosomes) phase of a taxon's life cycle. Two morphologically and genetically distinct and alternate stages together constitute the complete life cycle in sexually reproducing taxa, the other phase (sporophytic) being diploid (2n chromosomes). Any taxon whose life cycle is confined to one or the other phase is limited to asexual means of reproduction, since sexual reproduction and consequent genetic recombination are impossible without alternation between haploid and diploid states via meiosis and fertilization. The term gametophytic applies to any part of the haploid phase, including all unicellular to multicellular entities belonging to it, whereas gametophyte is reserved for the principal and directly gamete-producing stage of that phase. In all vascular plant taxa the sporophyte is the dominant and most conspicuous phase of the life cycle. The gametophytes of "lower" vascular plants (ferns and "fern-allies") are physically independent of the sporophytes and, though inconspicuous, merit description in their own rights. Those of gymnosperms and angiosperms are minute and physically dependent upon (contained within) sporophytic structures and are not usually included in morphological descriptions. In the flowering plants at least, the haploid phase is (presumably evolutionarily) reduced to such a degree that the existence of gametophytes per se is debatable. |
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pome |
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nominative |
fruit |
Indehiscent with accessory floral tube tissue adnate to the pericarp; derived from a single, inferior, compound ovary; the exterior thick and fleshy, the interior consisting of several locules bounded by cartilaginous tissue; in Rosaceae. |
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vascular |
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position |
|
Upon or otherwise directly associated with the vasculature. |
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racemose |
|
architecture |
inflorescence |
Comprising one or more racemes. |
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gynandrous |
|
architecture |
flower |
Having the androecium adnate to the gynoecium. |
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runcinate |
|
plane shape |
|
Basically obovate with a series of retrorse, acute lobes on either side, these diminishing in size toward the base. |
|
root 1 |
|
STRUCTURE |
|
Collectively, all those portions of a plant body that are anatomically distinct from the shoot, the component axes not differentiated into nodes and internodes, and branching endogenously. |
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intruded |
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placentation |
|
Upon partial septa excrescent from the wall of a compound, unilocular ovary. |
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infrafoliar |
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insertion |
|
Upon the stem directly below a leaf insertion. |
