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corolla tube 1 |
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STRUCTURE |
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A relatively narrow, fully connate portion of a sympetalous (gamopetalous) corolla proximal to a broader portion (limb) that comprises the distinct or connate distal portions of the petals; except in bisexual or staminate disc florets of Asteraceae (Compositae). |
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calyx tube |
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STRUCTURE |
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A relatively narrow, fully connate portion of a synsepalous (gamosepalous) calyx proximal to a broader portion (limb) that comprises the distinct or connate distal portions of the sepals. |
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perianth tube |
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STRUCTURE |
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A relatively narrow, fully connate portion of a syntepalous (gamotepalous) perianth proximal to a broader portion (limb) that comprises the distinct or connate distal portions of the tepals. |
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fissure |
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FEATURE |
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A relatively narrow, split or crack in the outer tissue(s) of a structure. |
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cross-vein |
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STRUCTURE |
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A relatively short, secondary or higher-order vein that runs directly between two veins of the next lower order, intersecting them more or less perpendicularly. |
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enation |
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STRUCTURE |
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A relatively small outgrowth from an otherwise regular boundary or surface of a larger structure. |
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emargination |
= notch |
FEATURE |
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A relatively small, acute sinus at the distal end of a laminar structure. |
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notch |
= emargination |
FEATURE |
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A relatively small, acute sinus at the distal end of a laminar structure. |
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ligule 3 |
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STRUCTURE |
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A relatively small, attenuate, membranous, laminar enation from the adaxial surface of a leaf near its base; in Selaginella, Isoetes. |
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umbo pl. umbines, umbos |
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FEATURE |
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A relatively small, rounded or conical, central protrusion upon an essentially round, broad face. |
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needle |
< leaf, macrophyll (not recommended), megaphyll |
STRUCTURE |
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A relatively stiff, compressed-acerose leaf; in Pinophyta. |
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prop root |
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STRUCTURE |
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A relatively stout adventitious root arising from the lower portion of a main stem and extending outward and downward toward the substrate, within which it ultimately becomes anchored, thus buttressing the aboveground portion of the plant. |
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stilt root |
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STRUCTURE |
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A relatively stout or strong adventitious root arising from a woody stem branch and extending downward directly toward the substrate, within which it ultimately becomes anchored, thus supporting the branch of origin; as in some Ficus (Moraceae). |
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squama pl. squamae |
= lepis; < scale, trichome |
STRUCTURE |
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A relatively thick, planate trichome. See also squamella (squamule). |
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lepis pl. lepides |
= squama; < scale, trichome |
STRUCTURE |
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A relatively thick, planate trichome. See also squamella. |
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membrane |
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STRUCTURE |
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A relatively thin layer of tissue that covers or separates other, different tissue(s) and/or empty space(s). |
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adventitious root |
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STRUCTURE |
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A root that arises laterally from some part of a shoot, often from the lower portion of a main stem. |
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aerial root |
> climbing root |
STRUCTURE |
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A root, adventitious or not, that originates and functions entirely above ground during the normal life cycle of the plant. |
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glome |
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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. |
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scallop |
= crena |
FEATURE |
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A rounded, marginal convexity or concavity in a series of such that alternate regularly and are oriented more or less perpendicular to the generalized perimeter of a laminar structure. See also sawtooth, sawtoothlet, scalloplet (crenule), tooth (dens), toothlet. |
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crena pl. crenae |
= scallop |
FEATURE |
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A rounded, marginal convexity or concavity in a series of such that alternate regularly and are oriented more or less perpendicular to the generalized perimeter of a laminar structure. See also crenule (scalloplet), dens (tooth), sawtooth, sawtoothlet, toothlet. |
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mamma pl. mammae |
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STRUCTURE |
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A rounded-conoidal protrusion, resembling the breast of a mammal. |
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annulus 2 pl. annuli |
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STRUCTURE |
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A row of protruding specialized sporangial wall cells that extends upward from the base of the sporangium and over its apex, thus forming an incomplete circumferential ring; esp. in Polypodiophyta. The inner and radial walls of the annular cells are markedly thickened and the structure functions as a spore-releasing and -disseminating mechanism as a result of differential stresses developed within the mature sporangial wall upon desiccation. |
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bud |
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STRUCTURE |
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A rudimentary, unexpanded stem, stem branch, inflorescence, inflorescence branch, or flower, or a combination thereof, in a resting state; enveloped or not by subtending protective scales. |
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bud scale |
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STRUCTURE |
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A scale that, alone or aggregated with others, envelops and protects a bud. |
