Pollen morphology of Neomillspaughia and Podopterus (Polygonaceae: Eriogonoideae: Coccolobeae)
DOI:
https://doi.org/10.18387/polibotanica.53.7Keywords:
Keywords: Palynology, taxonomy, woody genera, Mesoamérica.Abstract
SUMMARY
Neomillspaughia and Podopterus are two woody genera that inhabit deciduous forests of Mesoamerica. Both genera are monophyletic and have been classified in the Coccolobeae tribe. Although each has three species, the number of these used in phylogenetic studies is limited, so that their phylogenetic relationships in the tribe are still uncertain. Palynological studies in Eriogonoideae mention that pollen presents little variation, however, taxonomic value at species level have not been explored, since there is a diverse organization of colpI, pores and ornamentation among them. The objectives of this study are to characterize the pollen of Neomillspaughia and Podopterus and to explore its taxonomic value within the subfamily Eriogonoideae. The characterization of the pollen was carried out by observations with optical and scanning electron microscopy of pollen from herbarium specimens. Neomillspaughia was characterized by the presence of prolate to subprolate grains and microreticulated ornamentation; only N. hondurensis presented a vestibular structure at the aperture. In Podopterus, the grain shape varies from subprolate to prolate spheroidal and the ornamentation from microreticulated to reticulated. P. cordifolius has reticulated exin with deep and well-defined lumens; P. guatemalensis, presents a vestibular structure at the apertures and P. mexicanus exhibits tri-tetracolporate grains and lolongated apertures. The palynological characterization of the six species revealed that the number of colpi and the patterns of ornamentation of exine are similar to those found in other genera of the Eriogonoideae subfamily, so their taxonomic value is limited. However, the variation in the shape, number of colpi and apertures, as well as in the ornamentation of the exine of the pollen grains allow the accurate identification of the species. In this study we include descriptions and palynological keys of the genera and species, as well as light and scanning microphotographs.
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