Stomatal types of the genus Acacia (Fabaceae, Mimosoideae): an appraisal of diversity and taxonomic interest

Abstract

The stomatal types of 102 species illustrating the different subdivisions of Bentham's classification of the genus Acacia were studied at two or three ontogenetic stages: first pinnate leaf to bipinnate leaves or to phyllode. Six stomatal types are recognized on the basis of Guyot's nomenclature (1966): 1, 2, 3, 4, 4′, 6; a new type (3′) is described. The specialization of the leaf up to the phyllode stage is followed by a decrease of diversity of the stomatal formula and an increasing frequency of the ‘basic core’ 3, 3′, 4. The distinction between the two Australian groups of bipinnate species (series Pulchellae and Botrycephalae) is confirmed. Possible relationships between the cosmopolitan series Vulgares (the most primitive group) and some Australian taxa as well as between the Pulchellae and some phyllodic species from the Australian series Phyllodineae are commented on. The series Gummiferae looks quite distinct from other groups.

Complejos estomáticos de veinticuatro taxa de Mimosa (Leguminosae) presentes en México

“…Por su parte, Grosso et al (1994) estudiaron el tipo de complejo estomático en 102 especies de Acacia Mill., reconociendo dos tipos de complejos, el anomocítico y el anisocítico. En el caso particular del género Mimosa, se conoce que sus taxa pueden presentar folíolos hipostomáticos o anfistomáticos, que la presencia de complejos estomáticos de tipo paracítico es común, pero pueden llegar a presentar más de un tipo de complejo (Bässler, 1985;Chiamolera et al, 2011;Begum y Borthakur, 2013;Rothe y Bathe, 2014).…”