actinomorphic


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actinomorphic

[‚ak·tə·nō′mȯr·fik]
(biology)
Descriptive of an organism, organ, or part that is radially symmetrical.
References in periodicals archive ?
The genera of the Dicoma group have been characterized by the presence of mostly actinomorphic corollas with narrow tubes and wide limbs, acuminate or apiculate anther appendages, papillose style branches with a ring of subapical hairs, and echinate pollen in some genera (Cloiselia, Erythrocephalum, Pleiotaxis).
Florets with corolla actinomorphic, tubular-funnelform, five-lobed, lobes erect; marginal florets female; central florets bisexual; anther apical appendages acute, tails smooth; style bifid, branches dorsally papillose above and below the bifurcation point.
Flowers actinomorphic, reduced, choripetalous, wind pollinated, unisexual or bisexual.
Flowers usually 4- or 5-merous, slightly zygomorphic, but occasionally secondarily actinomorphic.
Calyx (2-) 4-5-merous; usually actinomorphic or rarely not so (outer lobe large and petaloid in Usteria); connate or free.
Flowers actinomorphic or very rarely zygomorphic (Dorothea); bisexual or rarely unisexual; nearly always epigynous; often heterostylic (Cinchona): pollination zoophilous (mainly entomophilous, especially Diptera, Hymenoptera, and Lepidoptera) or rarely anemophilous (Theligonum).
2 cm in diameter; floral bracts white, linear, acuminate, membranaceous, 4-8 mm x 1 mm, entire; flowers polystichous, ascendent to divaricate, numerous, densely disposed, actinomorphic, pedicellate, the pedicels 2.
5 mm, entire; flowers polystichous, ascendent to adpressed, numerous, densely disposed, actinomorphic, pedicellate, the pedicels 4.
b) Tubular (0+5 corolla lobes): actinomorphic, limb five-lobed at the apex, the lobes usually deeply or very deeply incised (Fig.
Florets isomorphic in bisexual capitula, corolla actinomorphic, tubular-funnelform, deeply five-lobed, lobes coiled; anther apical appendages apiculate, tails slightly papillose; style bifid, branches dorsally smooth; female capitula with florets without staminodes, corolla tubular-filiform, shallowly five-lobed, tube long, up to 2/3 of corolla length, lobes straight.
Florets dimorphic; marginal florets female, well-developed staminodes, corolla bilabiate, outer lip expanded; central florets bisexual, corolla actinomorphic, tubular-funnelform, deeply five-lobed; anther apical appendages long-apiculate, tails smooth; style bilobed, branches dorsally rugulose to papillose.
Florets isomorphic, bisexual, actinomorphic, tubular-funnelform, deeply five-lobed, lobes stiffly erect to slightly recurved, frequently pilose at the tip; anthers yellow to reddish, generally exserted, apical appendages acute to acuminate, tails smooth, free; style yellow to reddish, bilobed, branches dorsally rugulose to papillose much below the bifurcation point.