I own a hardcover edition of A New Human: The Startling Discovery and Strange of the "Hobbits" of Flores, Indonesia, by Mike Morwood and Penny van OOsteree. The book is copyright 2007. The book says that Homo floresiensis did not descend from Homo erectus, but that its skeletal characteristics of its limb bones and its curved phalanges are much like Homo habilis. Page 136 says the following.
"Another view, promulgated by Lee Berger, director of the paleoanthropology unit at the University of Wiwatersrand in Johannesburg, holds that Australopithecus africanus, which has relatively longer arms and shorter legs compared to Lucy, represents the more primitive, arboreal condition, and cannot therefore be derived from Australopithecus afarensis. Instead, he concludes that the two were contemporaries, and that Australopithecus africanus is the most logical ancestor for genus Homo.
Whatever is the case, the earliest members of genus Homo appeared in Africa by 2.3 million years ago."