|
labellum pl. labella |
< labium, lip |
STRUCTURE |
|
The third petal of a tripetalous flower when distinctively different from the other two, usually enlarged relative to them and/or differently shaped or colored, usually apparently the abaxial (lower) petal of the three due to resupination during ontogenesis; esp. in Orchidaceae. |
|
secondary vein |
< lateral vein |
STRUCTURE |
|
A strand belonging to the second order of vasculature in a leaf or other basically laminar structure, except when that is the ultimate order (consisting of veinlets); branching directly from a primary vein or, with undiminished diameter, from another strand of the second order. See also costa, primary vein, rib, tertiary vein, veinlet. |
|
needle |
< leaf, macrophyll (not recommended), megaphyll |
STRUCTURE |
|
A relatively stiff, compressed-acerose leaf; in Pinophyta. |
|
frond |
< leaf, macrophyll (not recommended), megaphyll |
STRUCTURE |
|
A leaf in Polypodiophyta or Palmae (Arecaceae), usually relatively large and often highly dissected. Use of this term in preference to "leaf" in descriptions of ferns and palms is a matter of tradition only, not of morphological or evolutionary distinction. |
|
pinna pl. pinnae |
< leaflet |
STRUCTURE |
|
One of the first-order divisions or leaflets of a pinnate frond; in Polypodiophyta. See also pinnule. |
|
pinnule |
< leaflet |
STRUCTURE |
|
A second- or higher-order division or leaflet of a pinnate frond; a division of a pinna; in Polypodiophyta. |
|
cone scale |
< macrosporophyll (not recommended), megasporophyll, microsporophyll; > ovuliferous scale |
STRUCTURE |
|
One of the membranous, fleshy, or woody sporophylls of a cone (strobilus); esp. in Pinophyta. |
|
carpel |
< macrosporophyll (not recommended), megasporophyll, pistil |
STRUCTURE |
|
A more or less abstract unit of floral structure conceptually equivalent to a simple pistil or its putative evolutionary precursor (megasporophyll) or derivative (constituent of compound pistil); often regarded as the basic evolutionary unit of the gynoecium. |
|
farinaceous 2 |
< mealy |
pubescence |
|
Loose, dry, and disintegrating in finely granular pieces like meal or flour. |
|
farinose |
< mealy |
pubescence |
|
Bearing minute, relatively stout trichomes, collectively meal- or flour-like (farinaceous) and easily detached. See also farinaceous. |
|
embryo sac |
< megagametophyte |
STRUCTURE |
|
The multinucleate generative cell of an ovule, within which fertilization and zygote formation occur; resulting from meiotic division of a megaspore mother cell within the nucellus, and thus genetically haploid; its contents generally considered to represent an evolutionarily reduced gametophyte. |
|
interpetiolar |
< nodal |
insertion |
|
Upon the stem between the bases of opposite leaves. |
|
interpetiolar |
< nodal |
position |
|
Upon the stem between the bases of opposite leaves. |
|
vestigial |
< obsolete (not recommended), rudimentary |
manifestation |
|
Not developing fully and not functional compared with corresponding structures in other taxa, and thought to have devolved to that state from a fully developed and functional structure in an ancestral taxon. |
|
pinnatisect |
< pinnate, pinnatifid |
plane shape |
|
Pinnately divided with the sinuses extending to the central axis. |
|
pinnatisect |
< pinnate, pinnatifid |
solid shape |
|
Pinnately divided with the sinuses extending to the central axis. |
|
ray 1 |
< primary axis |
STRUCTURE |
|
A first-order axis within a compound umbel. |
|
taproot |
< primary root |
STRUCTURE |
|
A primary root that remains dominant through the life of the plant as the main axis of a vertically oriented system that penetrates the substrate to a considerable depth. |
|
basal |
< proximal |
insertion |
|
At or very near the developmental origin (base) of a structure. |
|
basal |
< proximal |
position |
|
At or very near the developmental origin (base) of a structure. |
|
prominent |
< raised |
prominence |
|
Protruding above the general level of the surrounding surface. See also prominulous. |
|
prominulous |
< raised |
prominence |
|
Diminutively prominent, protruding only slightly above the general level of the surrounding surface. |
|
squamellose |
< scaly |
pubescence |
|
Finely squamose (lepidote). |
|
loment |
< schizocarp |
nominative |
fruit |
A schizocarp with superposed locules; derived from a single, superior, simple ovary; disarticulating at transverse constrictions between the locules; in Fabaceae (Leguminosae). See also legume. |
|
trabeculate |
< septate |
architecture |
|
Having one or more trabeculae. |
