That would be the tambalacoque tree, Sideroxylon grandiflorum, though others have suggested that the also-extinct giant tortoises there were more important to them. People have been able to do some of the work distributing them instead and apparently conservation is working.
I just leave this one here and say that mike stoklasa really is a starfleet-officer from the future, stranded here and unable to keep his mouth shut about the things to come…or he created that loop. may god have mercy with us…
One of my all-time favorite short stories, “The Ugly Chickens,” by Howard Waldrop, answers all questions. You can read it through Hoopla with your library card in the collection Howard Who?