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horizontal |
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orientation |
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Parallel to the horizon, perpendicular to the force of gravity. |
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involucel |
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STRUCTURE |
|
One or more closely proximate whorls of bractlets (bracteoles, prophylls) immediately subtending (below or outside) a subordinate portion of an inflorescence that is subtended as a whole by an involucre, the bractlets often leaf-like, sometimes petaloid. |
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apolar |
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architecture |
pollen grain, spore |
Lacking morphologically evident polarity. |
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infrafoliar |
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position |
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Upon the stem directly below a leaf insertion. |
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sheath (leaf) |
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STRUCTURE |
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The lower (basal or proximal), fundamentally laminar but strongly involute portion of one of the non-petiolate leaves characteristic of most monocotyledons (Liliidae); distinct from the leaf blade, which, when present, is borne distally upon it; analogous, though not necessarily homologous, with a petiole; usually more or less completely enclosing a portion of the stem above the node from which the leaf is borne. |
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annulus 1 pl. annuli |
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STRUCTURE |
|
A small ring-like protrusion from the strobilar stalk near its base and below the lowermost sporangiophores, sometimes bearing small sporangia; esp. in Equisetum. |
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laminate |
|
architecture |
foliaceous structure |
Having an expanded, more or less planate, distal portion (lamina or blade). |
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limb 2 |
|
STRUCTURE |
|
The portion of the corolla of a bisexual or staminate disc floret distal to the level of filament insertion; in Asteraceae (Compositae). |
|
size |
|
CHARACTER |
|
Nature as to absolute or comparative extent in any one dimension or in area or volume. |
|
stephanocolpate |
|
architecture |
pollen grain |
Having more than three surficial grooves (colpi) oriented meridionally. |
|
…merous |
|
architecture |
compound or compound-complex structure |
Having the number of equivalent component parts indicated by the prefix (e.g., petals in a corolla), or having different component sets of equivalent parts of that number in each set (e.g., calyx and corolla in a perianth); as in monomerous, oligomerous, polymerous, tetramerous, trimerous. |
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squarrose |
|
orientation |
lateral structure |
Having the proximal portion appressed and the distal portion deflexed, the latter more or less perpendicular to the surface of the bearing structure. |
|
marginal |
|
insertion |
|
Upon or otherwise directly associated with the margins. |
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straight |
|
course |
|
Lacking significant curves or bends. |
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motile |
|
habit |
|
Able to translocate by intrinsic means, as by flagellar propulsion. |
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deliquescent 1 |
|
architecture |
axis, laminar vein |
Branching laterally and repeatedly such that the initial axis loses its prominence over the length of the structure and seems to dissolve into the succesive orders of branches. See also excurrent. |
|
summer annual |
|
nominative |
plant |
Annual, germinating in spring or early summer, reproducing sexually with no prolonged vegetative stage beforehand, and dying by late summer or autumn. See also winter annual. |
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dovetailing |
|
habit |
trichome |
Papillate and serving to hold a surface to the opposing one of an appressed structure by interlocking with others on the opposing surface; sometimes furcate. |
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asymmetric(al) 1 |
|
architecture |
|
Not divisible into essentially equal halves along any line or plane. |
|
nucellus pl. nucelli |
|
STRUCTURE |
|
The distinct, genetically diploid tissue layer immediately surrounding the embryo sac of an ovule; often considered equivalent to a megasporangium wall. |
|
thallus 1 pl. thalli |
|
STRUCTURE |
|
The vegetative portion of a shoot when not differentiated into stem and leaves; esp. in Lemnaceae. |
|
cap cell |
|
STRUCTURE |
|
The single cell, or one of the several cells, forming the uppermost (distal) portion of an antheridial wall. |
|
epibracteal |
|
insertion |
|
Upon the bracts, or partially adnate thereto and apparently arising therefrom. |
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opaque |
|
coloration |
|
Not transmitting light. |
|
barb 2 |
|
STRUCTURE |
|
A trichome terminated by one or two small, relatively short, stiff, sharp, acutely reflexed appendages. |
