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Patterns Of Floral Structure And Orientation In Japonolirion , Narthecium, And Tofieldia, Margarita V. Remizowa, Dmitry D. Sokoloff, Paula J. Rudall
Patterns Of Floral Structure And Orientation In Japonolirion , Narthecium, And Tofieldia, Margarita V. Remizowa, Dmitry D. Sokoloff, Paula J. Rudall
Aliso: A Journal of Systematic and Floristic Botany
Floral evolution requires reassessment in basal monocots, including species formerly assigned to Melanthiaceae, in the light of recent developments in the molecular phylogenetics of monocots. We have investigated flowers of Tofieldia (Tofieldiaceae), Japonolirion (Petrosaviaceae), and Narthecium (Nartheciaceae). We confirm Engler's (1888) hypothesis that orientation of lateral flowers in monocots is dependent on presence and position of additional phyllomes on the pedicel. The type of floral orientation that occurs in Tofieldia is unusual for monocots, since the additional phyllomes are represented by calyculus scales rather than a bracteole, and the outer whorl tepals are initiated alternating with the calyculus scales. In …
Systematic Floral Anatomy Of Pontederiaceae, Michael G. Simpson, Darren H. Burton
Systematic Floral Anatomy Of Pontederiaceae, Michael G. Simpson, Darren H. Burton
Aliso: A Journal of Systematic and Floristic Botany
Twenty species of Pontederiaceae and six species of the outgroup families Haemodoraceae and Philydraceae were investigated with regard to floral anatomy, using standard histological methods and graphic reconstructions. Variation is described in several features, including functional carpel number, the distribution of floral aerenchyma, the presence of unusual floral epithelial cells, the presence, type, and distribution of tannin cells, crystal type and distribution, aspects of placentation, ovule number, number of ovule rows per carpel, and septal nectary presence. In order to better assess character homology, one of these features, placentation, was divided into three discrete characters: septal fusion, placenta position, and …