Echinodorus intermedius (Martius Grisebach und verwandte arten des Tropischen Amerika/
von C. Sc. Karel Rataj.
- S.l. : s.n., 1967.
- p. 613-619 : ill.
Title translated: Echinodorus intermedius (Martius) : various medical plants in Tropical America. Offprint from: Mitt. Bot. Munchen, Band vi, 613-619, 31.10.1967.