The systematic value of pollen morphology in trees and shrubs species of Bauhinia L. (Caesalpinioideae- subg. Bauhinia - sect. Pauletia) occurring in Brazil

Acta Botanica Brasilica

Fábio De França Moreira²  Ângela Maria Studart Da Fonseca Vaz¹  Claudia Barbieri Ferreira Mendonça²  Vania Gonçalves-esteves² 

[1] ,Universidade Federal do Rio de Janeiro Museu Nacional Rio de Janeiro RJ ,Brazil

关键词: Bauhinia;    Brazil;    Leguminosae;    palynology;   

DOI  :  10.1590/S0102-33062013000200014

来源: SciELO

【 摘 要 】

We analyzed the pollen grains of 30 taxa of the genus Bauhinia L., within five series: Aculeatae (9 species); Acuminatae (1 species); Cansenia (17 species); Pentandrae (2 species); and Perlebia (1 species). The pollen grains were acetolysed, after which they were photographed and analyzed under light microscopy. Non-acetolysed pollen grains were analyzed under scanning electronic microscopy. Characters such as shape, size, exine and aperture constitution were studied. The species were separated by a dichotomous key, which showed pollen grains that were classified as very large; isopolar or apolar; oblate, suboblate, oblate spheroidal or spherical; large or small in terms of the polar area; inaperturate, 3-porate or (3-7)-colpate; and microreticulate or reticulate, with or without supratectal elements (gemmae, bacula, clavae). The variation in pollen morphology confirms the eurypalynous status of the genus Bauhinia.

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