Comparative stem anatomy of Mirabilis (Nyctaginaceae)
Por:
Hernandez-Ledesma, P, Terrazas, T, Flores-Olvera, H
Publicada:
1 mar 2011
Resumen:
Mirabilis, a primarily American genus of 50-60 species almost restricted to the New World, is the most diverse within Nyctaginaceae. It not only has the greatest number of species, but also many life forms, with annual herbaceous, suffrutescent and shrubby species and with prostrate, decumbent to erect stems that are sometimes clambering. Stem anatomy has been studied only for M. jalapa, and its characteristics extrapolated to the entire genus. In this study we evaluated the taxonomic significance of stem anatomical characters from 24 species of Mirabilis, as well as their potential relation to habit evolution. Qualitative and quantitative characters of transverse and longitudinal sections were evaluated using light and scanning electron microscopy. Stem anatomy varies in several features. The phloem is arranged in short tangential spreading bands or in large tangential bands forming semi-complete rings; the conjunctive tissue is fibrous, with thin-walled sclereids and fibres, or paren
Filiaciones:
Hernandez-Ledesma, P:
Univ Nacl Autonoma Mexico, Dept Bot, Inst Biol, Mexico City 04510, DF, Mexico
Terrazas, T:
Univ Nacl Autonoma Mexico, Dept Bot, Inst Biol, Mexico City 04510, DF, Mexico
Flores-Olvera, H:
Univ Nacl Autonoma Mexico, Dept Bot, Inst Biol, Mexico City 04510, DF, Mexico
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