staminode


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Related to staminode: epipetalous

staminode

[′stā·mə‚nōd]
(botany)
A stamen with no functional anther.
References in periodicals archive ?
The identification and description of a staminode often remains vague and arbitrary, and may overlap a whole range of different structures: It is an abstraction of something that is neither a stamen (except for those cases with clearly abortive anthers), nor a petal proper, nor any other clearly distinguishable organ.
We could term this transformation from stamen to staminode, and to petal, "serial homeosis," but not in th e sense of Takahashi (1994).
In Musaceae (Andersson, 1998b), Strelitziaceae (Andersson, 1998c), Heliconiaceae (Andersson, 1998a), and Lowiaceae (Larsen, 1998b) the median posterior stamen is reduced to a staminode or is missing, and the flowers are more or less conspicuously bilabiate.
In Rutaceae, a group of genera (Cusparieae, Galipeae) has a monosymmetric androecium by reduction of stamens to staminodes on one side (Eichler, 1878; Engler, 1931; Kallunki & Pirani, 1998; Mabberley, 2000; Pirani & Kallunki, 2007; Groppo et al.
In all four ginger families, the petaloid staminode structures produce the bulk of the floral display (color, symmetry and pattern).
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).
Florets isomorphic, less commonly sub-dimorphic, bisexual or female with staminodes, corolla actinomorphic, tubular-funnelform, deeply five-lobed, or marginal corollas tubular-bilabiate with tube short (1/3 of corolla length), two incisions deeper than the others; anther apical appendages apiculate, tails smooth to papillose; style bilobed, branches dorsally smooth.
Florets usually dimorphic, when isomorphic, all slightly zygomorphic with corollas subbilabiate (4+1 corolla lips), lip not expanded; when dimorphic marginal florets female, with staminodes, corolla bilabiate to sub-bilabiate (3+1 corolla lips), outer lip expanded or not; central florets actinomorphic, tubular-funnelform, corolla shallowly five-lobed, lobes recurved, or slightly zygomorphic, five-lobed, lobes straight, with one or two deeper insicions; anther apical appendages acute, tails smooth to papillose, filaments usually papillose at the base; style bifid, branches dorsally papillose, sometimes glabrescent.
Frances Rivis' has attractive dark buds, producing large, nodding bell-shaped flowers in deep blue flushed violet with blue staminodes.
radiata) the capitula are heterogamous with the outer florets functionally female, with staminodes, and with the central florets bisexual (Freire et al.
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.
They may represent tepals, staminodes, stipules, ligules, reduced bracts, leaves, branch systems, or novel structures (Clifford, 1987).