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disc floret |
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STRUCTURE |
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A floret that has an actinomorphic corolla, is bisexual, functionally staminate, or functionally pistillate, and is borne in a radiate, discoid, disciform, or radiant capitulum (head) interior (distal) to any peripheral series of differing florets that may be present; in Asteraceae (Compositae). |
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flagellum pl. flagella |
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STRUCTURE |
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A very slender whip-like structure that extends from the main body of an antherozoid and, by active undulation, propels the cell through a liquid medium. |
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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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barbella pl. barbellae |
= barbel |
STRUCTURE |
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A small barb. |
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bristle 2 |
= seta; > glochid, glochidium; < trichome |
STRUCTURE |
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A trichome that is elongate, more or less straight, terete, fine-pointed, and stiff. |
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infructescence 2 (not recommended) |
= coenocarp, multiple fruit, syncarp; > fig, syconium |
STRUCTURE |
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A compound fruit derived from the connate or coherent ovaries and accessory tissue(s), if any, of two or more adjacent flowers. |
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vallecula pl. valleculae |
= colpus, fossula, furrow, groove, sulcus |
STRUCTURE |
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A longitudinal depression that is relatively shallow and narrow; esp. in fruits of Apiaceae (Umbelliferae). |
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fertile frond |
< spore leaf, sporophyll |
STRUCTURE |
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A frond that bears sporangia; in Polypodiophyta. See also sterile frond (trophophyll). |
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blade |
= lamina |
STRUCTURE |
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The expanded, more or less planate, distal portion, when present, of a leaf, leaflet or bract. |
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macrosporophyll (not recommended) |
= megasporophyll; > carpel, cone scale, ovuliferous scale |
STRUCTURE |
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A sporophyll that bears only megasporangia and, in Pinophyta, naked ovules that develop subsequently. |
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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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labellum pl. labella |
< labium, lip |
STRUCTURE |
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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. |
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receptacle 1 |
= torus |
STRUCTURE |
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The relatively short, simple, axial structure surmounting a pedicel and basal to the flower, usually broader than the pedicel. |
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gynostegium pl. gynostegia |
< corona |
STRUCTURE |
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An androecial corona, typically consisting of distinct hood- and/or horn-shaped enations that rise above the anthers; esp. in Asclepiadaceae. |
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spore body |
= sporocarp |
STRUCTURE |
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A multicellular structure that bears and more or less encloses several to (usually) many sporangia, the latter often aggregated into sori within it See also megasporocarp (macrosporocarp, not recommended), microsporocarp. |
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claw |
= unguis |
STRUCTURE |
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The abruptly much narrower proximal portion, when present, of a laminar structure, esp. a petal; of variable shape itself, but usually attenuate toward the base. |
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husk |
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STRUCTURE |
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A more or less dry, hard or fibrous, simple or compound enclosure or outer layer of a seed, fruit or inflorescence. |
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cucullus pl. cuculli |
= hood |
STRUCTURE |
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A cucullate (cuculliform) structure or component, esp. in an inflorescence or flower. |
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root 2 |
= radix |
STRUCTURE |
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A vascularized, primary or higher-order (branch) axis that is not differentiated into nodes and internodes and that branches endogenously, together with any non-axial structures borne from it; usually growing below ground level, but sometimes structurally and functionally specialized and growing wholly or partly aboveground (e.g. aerial root, knee root, pneumatophore). |
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flange |
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STRUCTURE |
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A relatively broad, circumferential rim or ridge that protrudes laterally. |
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caudex pl. caudices |
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STRUCTURE |
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The short, persistent, thickened, more or less erect, main stem of a perennial plant that otherwise has annual stems. |
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lateral vein |
>< costa, primary vein, rib; > secondary vein |
STRUCTURE |
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A longitudinal primary vein (costa, rib) that runs to one side of the midline, or a secondary vein that runs toward the lateral margin. See also tertiary vein, veinlet. |
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scale 1 |
< bract |
STRUCTURE |
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A basically dry, more or less appressed, diminutive bract. The choice of term as between the more general bract and the more restricted scale is sometimes problematic and, when so, often is dictated by custom according to the structure and taxon involved. |
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stamen |
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STRUCTURE |
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A seed-plant organ that produces and releases pollen; usually comprising a stalk (filament) that bears a locular structure (anther) containing sporogenous tissue; however, the filament may be lacking and the anther sessile, or the stamen may be undifferentiated, the whole then consisting of microsporangia embedded in or borne upon the surface of a more or less planate body of sterile tissue; one of the constituent organs of a bisexual or a staminate flower; may be distinct or else connate with one or more others and/or may be free or else adnate with one or more other floral structures. |
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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. |
