![]() Within the order Myrtales, this type of nonstructural androecial nectary is limited to Melastomataceae and is apparently very rare among angiosperms as a whole. ![]() Rather, most nectar-secreting species appear to produce the nectar from a thickened staminal vascular bundle. No structural nectaries (derived from differentiated parenchyma) were detected in any of the species examined. We also conducted field observations to clarify the site of nectar secretion in several genera. Our anatomical investigations included six species in three genera of Memecylaceae, a family traditionally placed within Melastomataceae. To determine the anatomical basis for nectar production in the relatively few nectar-producing taxa, we examined 40 species in 17 genera representing known nectar producers and genera and species not reported to secrete nectar. ![]() ![]() The vast majority of the 4,500-5,000 species in the primarily tropical family Melastomataceae do not produce floral nectar, instead relying on pollen as the pollinator reward. ![]()
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