Mostly epiphytes. Stems cylindric, angled or flattened. Areoles very small, slightly woolly, with hairs or bristles in some species. Leaves absent or reduced to minute scales. Flowers usually solitary, sessile, small; perianth-segments 5–12. Fruit white or coloured, naked or with a few scales. Seeds carunculate, with viscid endosperm.
Flowers lateral, small; perianth segments (5)8–13, the outermost 3–5 small, unequal, ± succulent, greenish, the inner 5–8 up to 3 mm. long, translucent.
Epiphytes, mostly pendent from trees, sometimes producing adventitious roots on the angled cylindrical stems.
Fruit mucilaginous, white, yellow or pink, naked or with a few scales.
Leaves absent or reduced to minute scales.
Seeds carunculate, with viscid endosperm.
Areoles very small, with deciduous setae.
Calyx-teeth very short, 3 or more
Petals 6–10, spreading, oblong
Ovary inferior, glabrous
Seeds without endosperm.
Stamens about 20