Fragrant prickly apple cactus (Cereus eriophorus var. fragrans), also known as fragrant woolly cactus - is a slender, columnar cactus tree. It can grow up to 5 meters tall on dry-sandy soil, prefers partial shade, it sometimes grows more horizontally (than in height) and likes to recline its long stems over surrounding vegetation.
Prickly apple is native to Florida but can presently only be found in three geographically-isolated areas of southeastern coastal Florida. Since November 1 of 1985 fragrant woolly cactus is listed as endangered. It is protected from destruction on public lands. Yet - on private lands the loss of habitat and fragmentation remain serious threat.
Seeds of this endangered succulent are most likely distributed by birds, rodents and gopher tortoises.Its flowers are showy and fragrant, white or pink-colored and open only at night.
Unfortunately, I couldn't find a good photo I could use.