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hysterophyllous |
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maturation |
non-foliar structure, esp. flower |
Maturing later than the leaves. |
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reclinate |
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vernation |
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Each with its blade oriented downward and parallel to the proximal portion of its distally recurved petiole. |
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mucilage |
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substance |
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A slimy exudate. |
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gametophyte |
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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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accessory cell |
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STRUCTURE |
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One of the cytologically distinctive epidermal cells that are sometimes present in a stomate and that surround and are regularly oriented in relation to the guard cells. |
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epibracteal |
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insertion |
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Upon the bracts, or partially adnate thereto and apparently arising therefrom. |
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rhizomatous |
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architecture |
plant |
Having rhizomes. |
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subsidiary cell |
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STRUCTURE |
|
One of the cytologically distinctive epidermal cells that are sometimes present in a stomate and that surround and are regularly oriented in relation to the guard cells. |
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trichotomous |
|
architecture |
axis |
Branching by division of the apical meristem producing three coordinate but not necessarily equal derivatives from each division. |
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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. |
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adenopetalous 1 |
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architecture |
flower, perianth, corolla |
Having petals produced from glandular structures. |
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salt-excreting |
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exudation |
|
Accumulating salt and discharging it directly to the exterior in a concentrated aqueous solution, the salt then crystallizing on the exterior following evaporation of the fluid medium; when salt-excreting glands are indicated in the nominative, usually they are called simply salt glands. |
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synanthous |
|
maturation |
non-floral structure |
Maturing at the same time as the flowers. See also coetaneous. |
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costal |
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insertion |
|
Upon or otherwise directly associated with the costa(e) of a laminar structure. |
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unbranched 2 |
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architecture |
laminar veinlet |
Not branching within the areole. |
|
erose 1 |
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margin |
|
Having rough, very irregular depressions throughout. |
|
bract 2 (strict sense) |
|
STRUCTURE |
|
Any primary or first-order lateral structure ontogenetically and anatomically analogous with, and therefore presumably homologous with, but relatively smaller than, a leaf, especially when subtending an inflorescence, other reproductive structure, or portion thereof; putatively, an evolutionarily reduced leaf. |
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ternate |
|
architecture |
foliaceous structure |
Palmate with three leaflets. |
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asymmetric(al) 1 |
|
architecture |
|
Not divisible into essentially equal halves along any line or plane. |
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excurrent |
|
architecture |
axis, laminar vein |
Branching laterally such that the initial axis retains its prominence over the length of the structure, the succesive orders of branches relatively smaller. See also deliquescent. |
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circumscissile |
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dehiscence |
|
Splitting transversely through the exterior wall about its entire circumference, the resulting upper cap-like portion falling away. |
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peripheral |
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insertion |
|
Upon or otherwise directly associated with the outer surfaces or regions of a three-dimensional structure. Although use of this term in two-dimensional contexts is technically correct, traditionally the term marginal is preferred in such cases. |
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barb 2 |
|
STRUCTURE |
|
A trichome terminated by one or two small, relatively short, stiff, sharp, acutely reflexed appendages. |
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disc floret |
|
STRUCTURE |
|
A floret that has an actinomorphic corolla, is bisexual, functionally staminate, or functionally pistillate, and is borne in a radiate, discoid, disciform, or radiant capitulum (head) interior (distal) to any peripheral series of differing florets that may be present; in Asteraceae (Compositae). |
