Stigmas
publication ID |
https://doi.org/10.3767/blumea.2017.62.02.07 |
persistent identifier |
https://treatment.plazi.org/id/03CC87AA-5143-7D55-FCB4-FDC2CDD25EB1 |
treatment provided by |
Felipe |
scientific name |
Stigmas |
status |
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Stigmas number is generally two, but in I. ntemensis View in CoL and I. tchoutoi View in CoL , three stigmas are present.Three stigmas occur in the Tristichoideae View in CoL which are sister to all other Podostemaceae ( Koi et al. 2012) View in CoL . It is possible that the three stigma character-state arose from ‘switching-on’ genes that had long lain dormant in the Podostemoideae View in CoL genome. However, it is more likely that this is simply an aberrant form of the 2-merous flower usual in Podostemoideae View in CoL since the rest of the flowers of the species concerned remain bimerous and not trimerous. It is difficult to explain how this unique synapomorphy occurs in such otherwise morphologically dissimilar species that co-occur at the same site unless one invokes horizontal gene transfer.
Generally the stigmas are filiform or linear and about 0.7–0.8 mm long, but in I. fluitans View in CoL and I. tenax View in CoL they are 1.2 mm long ( Cusset 1983). In I. gabonensis View in CoL , I. congolana View in CoL , I. pygmaea View in CoL they are 0.3 mm long, and in I. harrisii View in CoL 0.2 mm. The stigmas are thicker, c. 0.15 mm wide, approaching botuliform in I. ebo View in CoL . In I. feika View in CoL the stigmas resemble those of Dicraeanthus View in CoL being narrowly triangular and erect, tapering from a broad base to an acute apex.
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