Abstract Detail

Floristics & Taxonomy

Bonifacino, Mauricio [1], Mailhos, Ary [2], Susanna, Alfonso [3], Gavrilović, Milan [4], Janaćković, Pedja [4], Heiden, Gustavo [5], Valtierra, Victoria [1], Sancho, Gisela [6].

Pappus in Compositae: morpho-anatomical characterization and classification proposal.

Compositae is one of the most diverse plant families on the planet. A typical distinctive feature of the family is the presence of a highly modified calyx in a structure called pappus that plays an important role in the protection of the ovaries and fruits, as well as in the dispersal of the latter. The pappus is a highly variable structure among species, appearing in an enormous diversity of forms such as bristles, awns, capillary elements, paleaceous elements, or crowns, among others. Thus, it has been an useful character in systematics within the family and is considered to be very helpful for the delimitation of taxa at many taxonomic levels. However, there hasn’t been a review of the diversity of the pappus throughout the entire family since 1918, which has led to an inconsistent use of the descriptive terminology by different authors, making it difficult to accurately interpret botanical descriptions. As a part of a project that involves an international team, we aim at examining the pappus morphology of at least 50 species[GH1] distributed among a representative phylogenetically oriented sampling of 50 tribes in the 16 currently recognized subfamilies. Pappus morphology will be characterized using stereomicroscope and scanning electron microscopy, while its anatomy will be studied using light microscopy. Our ultimate objective is to generate a comprehensive characterization of the morphology of the pappus throughout the family and to formulate a proposal for the standardization of its descriptive terminology. [GH1]Why not 50 species from the 50 tribes?

1 - Universidad de la República (Uruguay)
2 - Universidad de la República (Uruguay)
3 - Botanic Institut Barcelona
4 - University of Belgrade - Faculty of Biology
5 - EMPBRAPA Clima Temperado (Brazil)
6 - Museo de La Plata

Scanning electron microscopy (SEM).

Presentation Type: Oral Paper
Number: F&T I007
Abstract ID:283
Candidate for Awards:None

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