Several Aniba species contain 4-methoxy-d-styryl-2-pyrones (I). Metabolites of this type are accompanied in two Piper species by dihydro (II) and tetrahydro (III) derivatives. We wish to report on the occurrence, now also in an Aniba species, A. gigantifolia O. C. Schmidt, of tetrahydroderivatives: the known dihydrokawain (IIIa), dihydromethysticin (IIIb) and tetrahydroiangonin (IIIc) and the new tetrahydro-11-methoxyiangonin (IIId). Additionally, anibine (IV), the pseudoalkaloid of A. rosaeodora Ducke and A. coto (Rusby) Kosterm., was also found to be present. The separation of type III compounds is notoriously difficult, and only partial separation of the crude C6H6 or EtOH extracts into sitosterol, a mixture, IIId and IV, in order of increasing polarity, was achieved by silica column chromatography. The mixture was resolved by fractional crystallization from C6H6 which gave pure IIIb in the first crop. The residual material was fractionated by careful chromatography on an alumina column. Light petrol.-Et2O eluted successively pure IIIa, pure IIIc and impure IIIb. The structure of IIId was deduced from its PMR spectrum which was identical with the spectra of IIIa, IIIb and IIIc with the exception of the signals due to the protons and the substituents of the aromatic ring. The constitution of this ring was established through oxidation of IIId to veratric acid. The absolute configuration of the Piper products IIIa and IIIb is known. The ORD curve of a sample of IIIb from Piper methysticum Forster, kindly supplied by Prof. R. Hänsel, Freie Universität Berlin, was superimposable on the analogous curves given by all type III constituents of A. gigantifolia. The same (6S)-configuration was consequently ascribed to all of them. The present report also corroborates the findings of Higo et al. that A. eriocelatra yields no easily crystallizable homogeneous sesquiterpene lactone components. 5,4'-Dihydroxy-3,7-dimethoxyflavone has previously been isolated from an unnamed new Beyeria species, from Alpinia Kumatake, A. japonica, Eucryphia lucida, Cistus ladanifera, Cheilanthes farinosa and Larrea cuneifolia, but not, to the best of our knowledge, from a Composite. Aldina heterophylla Bth. trunk wood C6H6 extract was chromatographed on silica giving sitosterol, aliphatic ketones and esters, and as major crystalline constituent (+)-maackiain [(6aS,11aS)-3-hydroxy-8,9-methylenedioxypterocarpan], besides much smaller quantities of (+)-maackiain and (+)-demethylhomopterocarpin (3-hydroxy-9-methoxypterocarpan). MS, NMR, UV and IR spectral measurements corroborated the identifications. Crudia amazonica Spr. ex Bth. trunk wood extract was also analyzed.