A very small family, with one genus and only a few species; natives of the Southwest and Mexico; the flowers are brilliant red, in terminal clusters; the sepals five, not united; the petals five, united into a tube, the lobes somewhat spreading; the stamens ten to fifteen, protruding, inserted under the pistil; the ovary imperfectly three-celled; the styles three, long, somewhat united; the seeds three to six, oblong, flattened, surrounded by a membranous wing or long, white hairs. These plants are very puzzling, but interesting, and as they are not nearly related they have at various times been classified with other families.