This dude claims the top picture is a Bougainvillea seed: Formidable Flowering Fence – MK pix I am not 100% convinced.

I haven't ever seen any seeds. Online, people are calling Chinese flame tree -bougainvillea but they are to totally different plants. come to think of it when all the bracts fall off if there were seeds, people would have them popping up all over their lawn. Much like rose of sharon.

I did find this: http://www.doityourself.com/stry/growing-a-bougainvillea-from-seeds

"The greatest challenge in propagating bougainvilleas from seed is acquiring viable seed. Bougainvilleas grow and thrive across the temperate regions of the northern hemisphere. Yet it is difficult to establish and maintain the optimal conditions necessary for bougainvilleas to lay seed. Look for large, well-established plants as a source of seed. It is commonly believed only the species is propagated by the seed, and the hybrid bougainvilleas are sterile. The plants grown from seed may vary markedly from the parent plant in appearance. Check for the colorful bracts that surround the flowers. Watch for the bracts to dry. They take about a month to ripen. Inside the bract are three pods, each containing a seed. The seeds should be plump, and are usually brown. Gently remove the seed from the pod. Fresh seed will be released easily from the “hairs” holding it, older seed may be held a bit more tightly in the pods."

my entire neighborhood is filled with these trees and I cant find any seeds, at least yet...