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antrorse |
|
orientation |
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Directed forward or upward, toward the distal end of the context of reference, parallel or at an acute angle to the bearing structure. |
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apetalous |
|
architecture |
flower, perianth |
Lacking petals. |
|
apex pl. apices |
|
CHARACTER |
|
Configuration of the uppermost, distal, or terminal portion of a structure, its extent determined somewhat subjectively in relation to the shape of the structure as a whole. The concept of apex varies from one descriptive context to another, since the apex is not a clearly delimited, morphologically distinct entity. The terms for describing apical condition are not strictly coordinate logically — some are more inclusive than others, some describe conditions involving what can be regarded as appendages, and some refer to the apex in a developmental as well as a strictly topological sense — and precise characterization may require using more than one descriptor. The semantic antecedent of some descriptors is "apex," whereas the antecedent of others is the structure as a whole (e.g., leaf ). |
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aphyllous |
= leafless |
architecture |
plant, axis |
Not bearing leaves. |
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apical |
< distal |
insertion |
|
At or very near the developmental end or tip (apex) of a structure. |
|
apical |
< distal |
position |
|
At or very near the developmental end or tip (apex) of a structure. |
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apiculate |
|
apex |
|
Terminating abruptly in a short, slender, angular tip that is not notably harder or stiffer than the main body of the structure. See also mucronate, mucronulate. |
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apiculum 1 pl. apicula |
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STRUCTURE |
|
A short, slender, angular tip that is not notably harder or stiffer than the main body of the bearing structure. See also mucro. |
|
apiculum 2 pl. apicula |
|
STRUCTURE |
|
The apex of a connective, when prolonged above the union of the anthers. |
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apocarpous |
|
architecture |
flower, gynoecium |
Having two or more simple pistils (carpels). |
|
apogamous |
< apomictic, asexual |
reproduction |
taxon, plant |
Producing new sporophytes from the gametophytes asexually, without intervening fertilization (or gametes). |
|
apolar |
|
architecture |
pollen grain, spore |
Lacking morphologically evident polarity. |
|
apomictic |
= asexual; > agamospermous, apogamous, aposporous, vegetative |
reproduction |
taxon, plant |
Producing new plants by means not involving meiosis or fertilization. |
|
apopetalous |
= choripetalous, dialypetalous, polypetalous |
architecture |
flower, perianth, corolla |
Having two or more distinct petals; having the petals unfused. |
|
aposepalous |
= chorisepalous, dialysepalous, polysepalous |
architecture |
flower, perianth, calyx |
Having two or more distinct sepals; having the sepals unfused. |
|
aposporous |
< apomictic, asexual |
reproduction |
taxon, plant |
Producing new gametophytes from the sporophytes asexually, without intervening meiosis (or spores). |
|
apostemonous |
|
architecture |
flower, androecium |
Having two or more distinct stamens; having the stamens unfused. |
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apotropous |
|
orientation |
ovule |
Anatropous but the whole recurved such that the raphe (adnate portion of the funiculus) faces the ovary wall (placenta) and the ovule is parallel to it, the micropyle facing the free basal portion of the funiculus. |
|
appendage |
|
STRUCTURE |
|
Any subordinate structure ontogenetically derived from and associated with a given organ or part. |
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appressed |
|
orientation |
lateral structure |
Angled at or near the base and closely flattened against the surface of the bearing structure, thus more or less parallel to it. |
|
approximate |
= close |
arrangement |
|
Disposed relatively near to one another. |
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aquatic |
|
habit |
plant |
Growing in water. |
|
arachnoid |
= cobwebby |
pubescence |
|
Of fairly sparse, fine, white, loosely tangled, capillate trichomes. |
|
arboreous |
< tree-form |
habit |
plant |
Having the character of a tree. See also arborescent, bushy, frutescent, fruticose, subshrubby, suffrutescent, suffruticose, woody-clumping. |
|
arborescent |
< tree-form |
habit |
plant |
Developing the character of a tree. See also arboreous, bushy, frutescent, fruticose, subshrubby, suffrutescent, suffruticose, woody-clumping. |
