Glands on the foliar surfaces of tribe Cercideae (Caesapiniodeae, Leguminosae): distribution and taxonomic significance

Anais da Academia Brasileira de Ciências

Joaquim M. Duarte-almeida¹  Milene S. Clemente¹  Rosani C.o. Arruda¹  Angela M.s.f. Vaz¹  Antonio Salatino¹ 

关键词: Bauhinia;    Brazilian forest;    Leguminosae;    secretory structure;    taxonomy;    tropical ecosystems;    Bauhinia;    floresta brasileira;    Leguminosae;    estruturas secretoras;    taxonomia;    ecossistema tropical;   

DOI  :  10.1590/0001-3765201520140151

来源: SciELO

【 摘 要 】

Large elongated glands occur on Cercideae leaf surfaces. Leaves of Bauhinia(55 taxa, 53 species), Cercis (1 species), Phanera (1 species), Piliostigma (2 species), Schnella (19 species) and Tylosema (1 species) were observed to determine location and relative number of glands. They were only observed on the abaxial leaf surface of 42 Bauhinia taxa. The glands were analyzed by light stereomicroscope and scanning electron microscopy. They are large (up to 270 µm long and 115 µm wide) and multicellular, containing lipophilic substances, probably volatile oils. Presence or absence and density of the glands in species of Bauhinia may be useful to determine species delimitation or distinction among infraspecific taxa. Higher density of glands is more common in species from "cerrado" (a savanna ecosystem) and "caatinga" (a semiarid ecosystem from northeast Brazil) areas. Bauhiniaspecies devoid of foliar glands are frequently from humid forests.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License