Ornithidium pendens (Pabst) Senghas
Field work carried out in collaboration with the Instituto de Pesquisas e Experimentação Agropecuária do Norte, Belém and financed in greater part by the National Science Foundation
Field work carried out in collaboration with the Instituto de Pesquisas e Experimentação Agropecuária do Norte, Belém and financed in greater part by the National Science Foundation