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acrodromous |
|
venation |
|
Having two or more primary and/or strongly developed secondary veins that diverge at or above the laminar base and are thence convergently arcuate toward the apex, reaching it or not. |
|
acropetal |
|
development |
|
Proceeding toward the apex, thus more advanced basally or proximally than apically or distally within a given frame of reference. |
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acroramous |
|
architecture |
axis |
Branching at or near the apex. |
|
acroscopic |
|
orientation |
subordinate structure |
Directed, facing, or pointing ("looking") toward the apex of the bearing structure. |
|
actinocytic |
|
architecture |
stomate |
Having several subsidiary cells oriented radially to its center. |
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actinodromous |
|
venation |
|
Having three or more primary veins that diverge radially from a point at or above the base of the blade and run toward the margin, reaching it or not. |
|
actinomorphic |
= regular |
architecture |
perianth, calyx, corolla |
Radially symmetric; divisible into two essentially equal portions along any median longitudinal plane. |
|
aculeate |
= spinose, spiny |
margin |
|
Having slender, stiff, sharp projections oriented in the general plane of the structure. |
|
acuminate |
= concave-tapered |
apex |
|
Gradually diminishing in width or diameter to a slender tip, the sides longitudinally concave. Corresponds with attenuate for base shape. |
|
acute |
= sharp |
apex |
|
Sharply angular; regularly and more or less straightly attenuate to an angular tip, the sides intersecting at an angle of less than 90°. |
|
acyclic |
= helical, spiral |
arrangement |
|
Disposed helically about and along the axis, each on a different radius than the one(s) vertically adjacent. |
|
adaxial |
= ventral (not recommended) |
insertion |
|
On or pertaining to the side or portion of a lateral structure that faces (or would face) toward the bearing axis when (or if) the axis of the lateral structure is (or were) oriented in the same general direction as the bearing axis. |
|
adaxial |
= ventral (not recommended) |
position |
|
On or pertaining to the side or portion of a lateral structure that faces (or would face) toward the bearing axis when (or if) the axis of the lateral structure is (or were) oriented in the same general direction as the bearing axis. |
|
…adelphous |
|
architecture |
flower, androecium |
Having two or more distinct sets of stamens, the sets differing from one another in the arrangements, insertions, positions and/or morphologies of the included stamens, the number of sets indicated by the prefix, at least one set with two or more members; as in diadelphous, monadelphous, triadelphous. |
|
adenopetalous 1 |
|
architecture |
flower, perianth, corolla |
Having petals produced from glandular structures. |
|
adenopetalous 2 |
|
derivation |
flower, perianth, corolla |
Having petals derived from glandular structures. |
|
adherent |
|
fusion |
dissimilar structure(s) |
Superficially joined with or to one or more other dissimilar structures, the connection(s) with no significant histological continuity. See also coherent. |
|
adnate |
|
fusion |
dissimilar structure(s) |
Intimately fused with or to one or more other dissimilar structures, the connection(s) with strong histological continuity. See also connate. |
|
adventitious |
|
derivation |
|
Arising more or less unpredictably from an organ, tissue, or site that is an unusual, abnormal, or atypical origin for structures of its type. |
|
adventitious bud |
|
STRUCTURE |
|
A vegetative or floral bud that arises directly from a root or from some site on a shoot other than a leaf axil or stem apex. |
|
adventitious root |
|
STRUCTURE |
|
A root that arises laterally from some part of a shoot, often from the lower portion of a main stem. |
|
aerial |
|
location |
|
Above ground or water level. |
|
aerial root |
> climbing root |
STRUCTURE |
|
A root, adventitious or not, that originates and functions entirely above ground during the normal life cycle of the plant. |
|
aerial-rooted |
> climbing-rooted |
architecture |
plant, structure |
Bearing aerial roots. |
|
aestivation |
|
CHARACTER |
|
Disposition of perianth (undifferentiated), calyx, or corolla members in the bud. |
