Extraction of the timber of Ptæroxylon obliquum(Thunb.) Radik. has given the known chromone heteropeucenin methyl ether (I) and also two new chromones, ptæroxylin and alloptæroxylin. A fourth compound, obliquin, has been identified as an æsculetin derivative, and a fifth, umtatin, has been characterised but not further studied. The new compounds have been allocated structures and their phytochemical significance is discussed.