|
isthmus |
|
STRUCTURE |
|
A narrower portion connecting two wider or broader portions of an inclusive structure. |
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smooth 2 |
|
relief |
bark |
Unfissured; not cracked or split to any significant degree. |
|
glome |
|
nominative |
inflorescence |
A rounded cluster of sessile or subsessile flowers that are inserted very close together and oriented divergently, the whole more or less hemispheric and sessile or subsessile. |
|
mucronulate |
|
apex |
|
Finely mucronate. See also apiculate. |
|
resupinate |
|
orientation |
lateral structure |
Inverted due to twisting distal to the point of insertion during development. |
|
sympodial |
|
architecture |
axes |
Branching laterally, each axis of each apparent order of branches comprising a series of laterally derived segments each of which functioned in turn as the distal leader, the apical meristem of each segment dominant until supplanted by that of the next. See also monopodial. |
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spinescent |
|
architecture |
|
Becoming spinose. |
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eusporangiate |
|
reproduction |
|
Having relatively large sporangia each of which develops from a group of initial cells that, by periclinal divisions, give rise to an outer layer of primary cells and an inner layer of sporogenous cells; in Psilotophyta, Lycopodiophyta, Equisetophyta, and some Polypodiophyta. |
|
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. |
|
gynoecium pl. gynoecia var. gynaecium |
|
STRUCTURE |
|
The pistil(s) of a single flower together with any ontogenetically equivalent or subordinate structures present, taken collectively; the total female (ovule-producing) structural complement of a single flower. It may include one to many pistils, each simple or compound. |
|
ringed |
|
relief |
bark |
Fissured, mainly horizontally, with at least some of the fissures individually encircling the stem more or less completely. |
|
leaf-opposed |
|
insertion |
|
Nodal and directly opposite the leaf. |
|
pliestesial |
|
duration |
plant |
Perennial and monocarpic, living several to many years before reproducing sexually, dying promptly thereafter. |
|
oblate |
|
plane shape |
|
Symmetrically elongate and broader than long perpendicular to the developmental or polar axis. |
|
deciduous 2 |
|
habit |
plant |
Perennial and having all leaves separating and falling away during a particular portion of the yearly cycle, especially the autumn or the dry season, between growing seasons. Semantically, this term is properly applied only to the entity that falls, not to the structure that it separates and falls from; in traditional usage, though, the term has been applied to trees and other perennial plants that shed all their leaves at some time during the yearly cycle. |
|
circumscissile |
|
dehiscence |
|
Splitting transversely through the exterior wall about its entire circumference, the resulting upper cap-like portion falling away. |
|
diaphragmed |
|
architecture |
pith |
Uninterrupted by cavities but heterogeneous in texture at axis maturity, with sectors of spongy tissue separated by relatively thin transverse plates of denser tissue that occur at the nodes or are otherwise regularly spaced along the axis. |
|
hydathode |
|
STRUCTURE |
|
A multicellular, anatomically distinctive structure located within a leaf at its periphery, its cells surrounding a central canal that opens to the exterior, through which water is actively discharged under humid conditions that impede the rate of transpiration; this liquid discharge is termed guttation. |
|
secund 2 |
|
architecture |
stem |
Having the petioles oriented such that the main bodies of all the leaves lie to one side of the bearing stem. |
|
tubular |
|
solid shape |
|
Cylindric or attenuate-cylindric overall and with a hollow interior open at one or both ends. |
|
disciform 2 |
|
architecture |
capitulum (head) |
Bearing one or more peripheral series of florets that are usually pistillate and that have relatively slender actinomorphic corollas, and one or more central series of florets that are bisexual or functionally staminate and that have relatively broader actinomorphic corollas; in Asteraceae (Compositae). |
|
floral |
|
position |
|
Upon, within, or associated with the flowers. |
|
lumen pl. lumina |
|
FEATURE |
|
A space enclosed by the wall(s) or membrane(s) of a structure. |
|
pseudopetiole |
|
STRUCTURE |
|
A distinctly constricted, more or less stalk-like, proximal portion of a leaf, evolutionarily derived from the blade, the original petiole reduced to the point of absence or vestigiality; esp. in Poaceae (Gramineae). |
|
collar 2 |
|
FEATURE |
|
The junction between the sheath and blade of a leaf; esp. in Poaceae (Gramineae). |
