Anatomically preserved taxodiaceous conifer remains are described from the middle Miocene Yakima Canyon flora of central Washington State, USA. These remains include ovulate cones and seeds, isolated cone scales, wood, foliage and twigs of possible taxodiaceous affinity. Some seeds contain mature embryos. While many specimens are contained within the chert matrix, others have been weathered out and are preserved in the round, showing external morphological features. Isolated cone scales range from 9-11 mm high x 11-12 mm wide x 4 mm thick and bear two seed depressions on their inner surface. The apophysis has an umbo that protrudes 3 mm from the outer surface of the scale and a dentate margin on the apical half. Isolated seeds are winged, elongate, 11.5-13 mm long x 6 mm wide x 3-4 mm high, and are triangular in cross section. Foliage shows prominent stomatal furrows. The taxodiaceous remains at Yakima Canyon occur commonly with the ferns Osmunda wehrii Miller, Woodwardia virginica (L.) J. E. Smith, and a third small filicalean form and are considerably more abundant than the previously described pine from this same site, Pinus foisyi Miller.

Key words: fossil conifer, Miocene, permineralization, Taxodiaceae, Yakima Canyon