Pollen morphology of Waltheria L. (Malvaceae-Byttnerioideae) from Bahia, Brazil

Citations of this article
Mendeley users who have this article in their library.


Waltheria encompasses about 60 species distributed in Brazil and Mexico. To improve the palynology of the genus, we analyzed 14 species occurring in the Brazilian State of Bahia. Pollen grains were acetolyzed and examined using light microscopy and scanning electron microscopy. Non-acetolyzed pollen grains were viewed by transmission electron microscopy. The results revealed two general pollen types based on exine ornamentation, such as reticulate and echinate, which are distinct with regard to (1) size and shape, (2) apertural type and number, (3) relative length of ectoapertures, and (4) thickening of the nexine compared to the sexine. An ultrastructural analysis of the pollen wall revealed a continuous foot layer and a compact and discontinuous endexine in most cases. The sexine consisted of heterogeneous columellae, which support a perforated semitectum (echinate type) or the semitectum was composed of perforations and muri-shaped thickening (reticulate type). These results confirm a high degree of pollen dimorphism in Waltheria associated with heterostyly.




Silveira Júnior, C. E. A., e Lima, L. C. L., & Saba, M. D. (2017). Pollen morphology of Waltheria L. (Malvaceae-Byttnerioideae) from Bahia, Brazil. Acta Botanica Brasilica, 31(4), 597–612. https://doi.org/10.1590/0102-33062017abb0159

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free