Rhipsalideae - The Rhipsalideae are a small tribe of cacti comprising four genera (and around 60 species). They grow on trees (epiphytes) or on rocks (lithophytes) where they either hang down or form creeping or upright shrubs. Their flowers open in the day and remain open at night; they may be either radially symmetrical (regular) or bilaterally symmetrical (zygomorphic). Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
Plant