Herb with usually erect or ascending, branched stems. Leaves with a suppressed gland between or just below the lowest pair of pinnae; Seeds 8-20.
An American species already collected in the Botanical Gardens Bogor in 1846 by Zollinger, but never naturalized there. In a recent report Stone (l.c.) stated that it has now become a pest in pineapple plantations in Johore, Malaya. It has been recorded also from India (Windler, l.c.).