A late Eocene wood assemblage from the Crooked River Basin, Oregon, USA Author Wheeler, Elisabeth A. Author Manchester, Steven R. Author Baas, Pieter text PaleoBios 2023 2023-11-01 40 14 1 55 http://dx.doi.org/10.5070/p9401462457 journal article 10.5070/P9401462457 0031-0298 KLAASSENOXYLON GEN. NOV. Diagnosis— Growth rings distinct to indistinct. Wood diffuse-porous. Vessels solitary and in short radial multiples. Perforation plates exclusively simple; intervessel pits alternate, minute to small; vessel-ray parenchyma pits similar to intervessel pits. Axial parenchyma rare, scanty paratracheal. Fibers with simple pits, septate and non-septate. Rays uniseriate (rarely biseriate), heterocellular. Crystals, if present, in chambered fibers Etymology— For René Klaassen, whose monograph on the wood anatomy of the Sapindaceae was a major contribution to our understanding of this family.