Polhilli R M Ed Flora of Tropical East Africa : Prepared at the Royal Botanic Gardens, Kew with Assistance from the East African Herbarium (Eriocaulaceae) .-9-789061-91377-1 - CRC Press Taylor & Francis Group, New York, New York 1997 ISBN: 9-789061-91377-1 Dewey Class. No.: I22-9557 N97/B28591