Ayensu, E S books & textbook
Systematic Anatomy and Ontogeny of the Stem in Passifloraceae, 1964, Contributions from the United States National Herbarium, Volume 34, Part 3 : pages 45-73 with 12 plates.
United States National Herbarium /1964-01-01 Paperback
Flora of Tropical East Africa: Velloziaceae
Royal Botanic Gardens, Kew /2000-01-15 Paperback / 9 Pages
isbn-10: 1842463284 / isbn-13: 9781842463284
