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Floral Morphology And Phylogeny In The Hydrocharitaceae, Robert B. Kaul
Floral Morphology And Phylogeny In The Hydrocharitaceae, Robert B. Kaul
School of Biological Sciences: Faculty Publications
The vascular anatomy of 13 of the 15 genera of the Hydrocharitaceae has been studied, and certain aspects of floral morphology are considered. The flowers of the family show a broad range of specialized structures combined with primitive characteristics. The origin of paired and single stamens is interpreted as probable modifications of fascicled stamens. Extreme reduction in the androecium is shown for several genera. Tendencies toward reduction and fusion within the gynoecium are pronounced. Most genera are at least slightly syncarpous, but a few are apocarpous. The inferior ovary is appendicular in nature, with some genera exhibiting more complete fusion …
Floral Development And Vasculature In Hydrocleis Nymphoides (Butomaceae), Robert B. Kaul
Floral Development And Vasculature In Hydrocleis Nymphoides (Butomaceae), Robert B. Kaul
School of Biological Sciences: Faculty Publications
The flower of Hydrocleis nymphoides consists of three sepals which arise in spiral succession, three simultaneously arising petals, numerous stamens and staminodia which arise in centrifugal order, and six carpels. A residual apex remains at maturity. The first-formed members of the androecium are stamens and the later-formed members are staminodia which develop below the stamens and which become outwardly displaced during expansion of the receptacle. The androecium is supplied by branching vascular trunk bundles. The carpels are completely open but the ventral margins are slightly conduplicately appressed basally. A single dorsal bundle provides the stigmatic area with vascular tissue, and …