staminode

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staminode

[′stā·mə‚nōd]
(botany)
A stamen with no functional anther.
References in periodicals archive ?
Emberger (1939) interpreted the nectaries of Fagopyrum as staminodes, because of the spatial and numerical correlation between stamens and nectaries.
Trying to recognize staminodes or any other structures surrounding the ovary, if no structural evidence of their homology with stamens exists, is senseless.
Since the size and shape of the flower is adapted to the wasp's head, wasps would seem to be the most efficient pollinators; the staminode may act in forcing the insect's head downward so that its chin brushes anthers or stigma (DeVos, 1983).
For example, a "beardtongue" staminode like the one in Penstemon (Cheloneae, Scrophulariaceae) also occurs in Jacaranda (Bignoniaceae); petal aestivation, or folding in the buds, shows both ascending and descending patterns within Scrophulariaceae, Lentibulariaceae, and Bignoniaceae, ascending and quincuncial patterns within Acanthaceae, and descending and quincuncial patterns in Orobanchaceae [whereas their presumed closest relatives, Rhinantheae (Scrophulariaceae) have ascending petal folding]; personate corollas similar to those of Antirrhineae (Scrophulariaceae) are exhibited by some Acanthaceae, Gesneriaceae, Bignoniaceae, and Lentibulariaceae; other parallelisms occur in ovary structure, ovule number, sensitive stigma lobes, and postgenital fusion of the anthers (Endress, 1994).
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 with staminodes, corolla tubular-funnelform, deeply fourlobed; central florets bisexual or male with a rudimentary ovary, corolla tubular-funnelform, deeply five-lobed; anther apical appendages rounded to acute, basally constricted and demarcated from the thecae, basally auriculate with tails very short, smooth to slightly papillose; style bilobed, dorsally papillose.
Frances Rivis' has attractive dark buds, producing large, nodding bell-shaped flowers in deep blue flushed violet with blue staminodes.
Florets dimorphic or rarely isomorphic; marginal florets female, with staminodes, corolla bilabiate, outer lip expanded or not, inner lip developed to very reduced, or true ray; central florets bisexual, corolla bilabiate; or all the florets bisexual, corolla bilabiate, sub-bilabiate (4+1 corolla lips), or ligulate; anther apical appendages acute, tails smooth; style bilobed, dorsally papillose.
In Coehlospermaceae, the androecium in Amoreuxia is onesided, with staminodes on one side (Poppendieck, 2003).
In all four ginger families, the petaloid staminode structures produce the bulk of the floral display (color, symmetry and pattern).
A typical palm flower is small (1-2 cm), with 3 imbricate sepals, 3 valvate petals, six stamens or staminodes, and 3 uniovulate carpels or a trifid pistillode.
In many genera of Mutisieae the anthers are reduced to staminodes in the functionally female florets.