Now during the late rainy season a certain medium sized tree here is producing such a bounty of white, three-inch broad, exotic-looking flowers that you have to stand and look awhile when you pass one. I can't find a Spanish or English name for it but it's a member of the genus Luehea, probably LUEHEA SPECIOSA. It's fairly common in hedgerows and brushy abandoned cornfields. A flowering branch is shown below:
Northerners familiar with Lindens, or Basswoods, may find it hard to believe that those large, showy blossoms are produced on a tree in the Basswood Family, the Tiliaceae. Basswoods have small flowers. However, once you think about it, the leaves in the picture are similar to those of basswoods. Also, despite the flowers' much greater size, their basic structure is similar to that of basswood flowers-- five sepals and petals, stamens many with some being reduced to sterile staminodia, and a long, slender style inside the stamen cluster. You can see a Luehea blossom, with its typical bruised-looking petals, below:
In that picture, note the flat clusters of white, hairlike staminodia curving along the corolla's bowl- shaped floor. They're very conspicuous and give the blossoms an exotic look, but who knows what they're for? Maybe they're footholds for pollinators who land inside the fragrant flowers. And who knows why it's typical for the large, white petals to have those messy-looking, bruised fringes, but that condition seems to be typical of all its flowers.
from the June 19, 2016 Newsletter issued from Hacienda Chichen Resort beside Chichén Itzá Ruins,
central Yucatán MÉXICO
A good field mark for Luehea speciosa is that its broadly oval leaves are white-hairy below, as shown below:
Nowadays Luehea fruits are turning up, shaped like small, brown, hairy, American-type footballs, as shown
The capsular-type fruit is shallowly ribbed. Another Luehea species occurs in the area, but its fruits are much more conspicuously ribbed. At maturity the capsules split at their far ends into five or so "teeth," which spread apart, allowing seeds to escape from inside the capsule when something such as wind shakes its branch.
Luehea speciosa fairly commonly occurs throughout nearly all of humid, tropical America, and in many places it's regarded as medicinal.
The online Biblioteca Digital de la Medicina Tradicional Mexicana reports that in Veracruz State, to treat diarrhea, one boils three 10x20cm sections of bark in one liter of water, and takes half a cup of the resulting tea three times a day. For snakebite, make the above brew but with an added 20cm of Guaco root. Drink half a cup of that brew every three hours for the whole day. I suppose they know what Guaco is in Veracruz.