Handbook of palynology

Plant Breeding Systems.

https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1096-0031.2008.00212.x

Plant Systematics: A Phylogenetic Approach

Nectar production and presentation

The construction of classifications, as well as the understanding of biological diversity, depends upon a careful comparison of attributes of the organisms studied (Stuessy, 1990). It is widely known that data from diverse sources showing differences from taxon to taxon are of systematic significance. During the 20th century, systematists have emphasized that their discipline involves a synthesis of all knowledge (Stevens, 1994) or, in other words, the variation of as many relevant characters as possible should be incorporated into the natural system to be constructed. The extent to which particular characters are constant or labile will determine their usefulness to systematics. In general, more conservative characters will be valuable in defining families and orders, whereas more labile characters may be useful at the generic and specific levels (Webb, 1984). There is no doubt that floral characters are among the most used in the classification of flowering plants. At the same time, they constitute essential features in diagnostic keys to taxa in both taxonomic treatments and Floras (Cronquist, 1981, 1988).

A systematic survey of floral nectaries

Fil: Lattar, Elsa Clorinda. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Nordeste. Instituto de Botanica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botanica del Nordeste; Argentina

Ovule and megagametophyte development in selected species of Apeibeae and Grewieae (Malvaceae–Grewioideae) from South America and its systematic implications

Morphology, anatomy, and ultrastructure of the floral nectary of Alphitonia excelsa (Rhamnaceae) in relation to its taxonomic position

Colleters, osmophores, and nectaries in the species Ceropegia lenewtonii: a sapromyiophilous stapeliad (Asclepiadoideae, Apocynaceae).

The mature anther wall of Cestrum bigibbosum consist of a papillae epidermis and one layer of endothecium. The development of the anther wall retrieves the dicotyledoneous type, showing periclinal division in some zones of the middle layer. The endothecium shows a reticulate pattern of thickening, with more branches in the central region of the cell. The tapetum is secretory and degenerates at the free microspore stage. Microspore tetrads are tetrahedral and the pollen grain is two-celled at the shedding stage. Taxonomic significance of male gametophyte is discussed.

http://erevistas.saber.ula.ve/index.php/pittieria/article/download/6550/6364

Beatriz G. Galati

Papers

Ovule and megagametophyte development in selected species of Apeibeae and Grewieae (Malvaceae–Grewioideae) from South America and its systematic implications

Morphology, anatomy, and ultrastructure of the floral nectary of Alphitonia excelsa (Rhamnaceae) in relation to its taxonomic position

Colleters, osmophores, and nectaries in the species Ceropegia lenewtonii: a sapromyiophilous stapeliad (Asclepiadoideae, Apocynaceae).

Desarrollo de la antera y formación del grano de polen en Cestrum bigibbosum Francey (Solanaceae)

Review on tapetal ultrastructure in angiosperms