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Excerpts from Jim Conrad's
Naturalist Newsletter
from the March 5, 2017 Newsletter issued from Rancho Regenesis in the woods ±4kms west of Ek Balam Ruins; elevation ~40m (~130 ft), N20.876°, W88.170°; north-central Yucatán, MÉXICO
BULLY TREE
Along a forest trail a young tree about ten feet tall (3m) bore dark green, leathery leaves, sharp, slender spines on stiff, gray stems, and maturing, pea-sized fruits, as shown below:
Notice that the green fruits turn black when mature. A close-up of some fruits is shown below:
One unusual feature is the stiff, slender bristle arising atop each fruit. At the fruits' bases, the sepals are somewhat rounded and their edges overlap. The fruits, on short stems, or pedicels, cluster in groups of two, three or so. An immature fruit opened to reveal a single large, hard, brown seed is shown below:
When that fruit's top was cut off, copious white, milky latex oozed from the wound. Notice at the bottom of the picture how sticky strands of latex run from the fruit's bottom to my fingertip.
Interestingly, in every mature fruit I opened the seed had been replaced by what could have been brown sawdust, which I assumed to be frass or excreta of an insect larva that had developed inside the seed. Many of the black fruits bore a hole -- apparently where the metamorphosed, seed-eating adult had emerged -- as shown below:
This little tree was a member of the Sapodilla Family, the Sapotaceae, which contains several species producing delicious fruits much eaten in tropical America -- such as the Mamey, Chicozapote and Canistel. It belongs to the genus Sideroxylon, of which several species are listed for the Yucatan Peninsula. It's hard to find good pictures of the various Sideroxylon species, and I just can't be sure which species this is.
UPDATE: Years later with much more information and images on the Internet, this looks closest to SIDEROXYLON OBTUSIFOLIUM ssp. BUXIFOLIUM. Most species appear to have more spherical fruits. Sideroxylon celastrinum produces such oblong fruits, but its leaves tend to be narrower, and it's more restricted to coastal areas, though not entirely. Sideroxylon obtusifolium ssp. buxifolium occurs in somewhat dry foress in the Yuctan Peninsula, south and near the central and southern coasts of western Mexico, south through most of Central America and in northern South America.