|
apical |
< distal |
position |
|
At or very near the developmental end or tip (apex) of a structure. |
|
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. |
|
apiculum 1 pl. apicula |
|
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. |
|
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. |
|
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. |
|
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. |
|
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. |
|
archegonium pl. archegonia |
|
STRUCTURE |
|
A female gametangium; a multicellular fertile organ of a mature gametophyte within which female gametes (eggs, ova) are produced and fertilized; having a broad, bulbous base and a narrower distal neck. Technically present but highly reduced and of no descriptive significance in Magnoliophyta. |
|
arching |
= recurved |
orientation |
|
Curving backward or downward. |
|
architecture |
|
CHARACTER |
|
Composite structural configuration as to type, orientation, symmetry, insertion, position, fusion, presence, number, relative size, shape, texture, differentiation, and/or derivation of components and features. Overlaps conceptually with habit. |
|
arcuate 1 |
|
course |
|
Curving more or less regularly in one direction. |
|
arcuate 2 |
|
plane shape |
|
Elongate and more or less regularly curved from one end to the other, one side convex, the opposite concave. |
