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secondary vein |
< lateral vein |
STRUCTURE |
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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. |
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fossulate |
= colpate, furrowed, grooved, sulcate, valleculate |
architecture |
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Having one or more elongate, relatively narrow and shallow depressions (fossulae). |
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haustorium pl. haustoria |
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STRUCTURE |
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An absorbing and anchoring organ, often root-like, excrescent from a vegetative part of a parasitic or hemiparasitic plant, by which the plant communicates intimately with and derives sustenance and support from its host plant, into whose tissues the haustorium intrudes. |
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thread-like |
= filiform |
solid shape |
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Elongate and very slender, basically round in transverse section and of more or less uniform diameter, variously curved over its length or not. See also hair-like (capillary, capillate). |
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acropetal |
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development |
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Proceeding toward the apex, thus more advanced basally or proximally than apically or distally within a given frame of reference. |
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arcuate 2 |
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plane shape |
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Elongate and more or less regularly curved from one end to the other, one side convex, the opposite concave. |
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lustrous |
= glossy, laevigate, polished, shining, shiny |
reflectance |
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Uniformly reflecting a high proportion of incident light at all angles. |
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bract 2 (strict sense) |
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STRUCTURE |
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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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corm |
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STRUCTURE |
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A short, thickened, solid, usually subterranean, sometimes fleshy stem base containing stored carbohydrates and serving as a perennating organ. |
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plumule |
= epicotyl |
STRUCTURE |
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A distinguishable nascent shoot developed in the embryo in some taxa, consisting of a shoot axis with unexpanded internodes and one or more leaf primordia, being that portion of the embryo above the level of cotyledon insertion; the primordial shoot, when developed by the embryo within a seed; the first bud of a spermatophyte, when developed by an embryo within the seed. In other taxa the shoot is represented in the embryo only by a quiescent apical meristem at the summit of the embryonic axis. |
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diamond-shaped |
= rhomboid |
solid shape |
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Transversely square, broadest and longitudinally angular at the middle, regularly attenuate to angular ends, all faces essentially plane; like the stylized shape of a diamond. |
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epicarp |
= exocarp |
STRUCTURE |
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The outermost tissue layer of a pericarp. |
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scalariform |
= ladder-like |
arrangement |
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Disposed in vertical sequence with long axes horizontal and parallel. |
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flexuous var. flexuose |
= zig-zag |
course |
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Having alternating angular bends to either side, more or less straight between the bends. |
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small-toothed |
= denticulate |
margin |
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Finely toothed (dentate). See also sawtoothed (serrate), scalloped (crenate), small-scalloped (crenulate), small-sawtoothed (serrulate). |
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gynaecium |
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STRUCTURE |
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See gynoecium. |
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stomatal apparatus |
= stomate, stoma (broad sense) |
STRUCTURE |
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A localized functional epidermal unit consisting of a microscopic pore and two encircling specialized cells, the guard cells, which, through changes of turgor pressure in response to environmental conditions, regulate the size of the pore and thus the rates of transpiration and gas exchange through it; the whole surrounded or not by associated, cytologically distinctive epidermal cells, the subsidiary or accessory cells, which, when present, are regularly oriented in relation to it. |
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incised |
= cut, lacerate, torn; > laciniate, slashed |
plane shape |
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Having straight to irregular lines of separation extending inward from the margin. See also cleft (dissected, divided, lobate, lobed, parted, partite, segmented). |
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teardrop-shaped 1 |
= lacrimate |
plane shape |
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Broadest just below the middle, broadly rounded to the base, and acutely attenuate to the apex; like the stylized lateral outline of a teardrop. |
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lax |
= loose |
architecture |
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Having equivalent constituent parts disposed distant from one another. |
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umbilicate |
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solid shape |
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Having a relatively small, transversely round, central depression in an essentially round broad face. |
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zig-zag |
= flexuous |
course |
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Having alternating angular bends to either side, more or less straight between the bends. |
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multiciliate |
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architecture |
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Having several to many cilia. |
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carpophore 3 |
= columella; < stalk |
STRUCTURE |
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The stalk supporting a mericarp after dehiscence of a schizocarpic fruit, the central axis of the fruit having split longitudinally to yield two or four such stalks; composed of receptacular and (primarily) gynoecial tissues; esp. in Apiaceae (Umbelliferae). |
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paired |
= conjugate, geminate |
arrangement |
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Inserted by pairs, the members of each fused or not. |
