Cipura is a genus in the Iridaceae family, native to Central and South America growing in grassland and scrub.
Dave Brastow encountered these plants, in mid-March, at the Explorer's Inn, in the Reserva Nacional Tambopata, Peru. This was definitely a jungle environment, with 30 °C temps and 98% humidity. The flowers are about 3 cm across, and open early in the morning, closing by mid-day. There were multiple flowers, opening in daily succession. The leaves were pleated. The bulb was about 2 cm long by 1 cm across, with a brown tunic and roots coming from a basal plate about 5 cm deep in a heavy clay soil.
Cipura xanthomelas Maxim. ex Klatt is a rare species from Brazil, a very narrow endemic to acidic, red, tropical soils. It is winter dormant and has a bulb that looks tarred. Photos from Andrew Harvie.