The diverse uppermost Pennsylvanian flora from the Hamilton Quarry, Kansas includes approximately five conifers and conifer like coniferophytes. These are the short needled Emporia lockardii, two other short needled species, the long needled coniferophyte Barthelia furcata, and a long needled conifer species with a distinctive pattern of branching, cuticular features, and internal anatomy. This plant is represented by approximately 40 specimens of vegetative shoots and one ovulate cone. The long needled conifer shoots consist of two orders of plagiotropic branches with helically arranged leaves. Leaves are amphistomatic, with parallel rows of stomata like the European genus Ernestiodendron rather than two adaxial bands like most other species of walchian conifers. Ultimate leaves are simple, while penultimate leaves are forked. Internal anatomy is similar to Emporia lockardii, but the solid pith has sclerotic nests that are not known to occur in E. lockardii. The ovulate cone is compound, with ovuliferous dwarf shoots in the axils of helically arranged, forked bracts. Ovuliferous dwarf shoots have numerous sterile scales and 2-3 interspersed sporophylls, each bearing an inverted terminal ovule. This new conifer displays a distinctive combination of characters that include regularly branched plagiotropic shoots, position-dependent heterophylly, long needles on ultimate branches, amphistomatic leaves with stomata in parallel rows, Emporia-like ovuliferous dwarf shoots, and sclerotic nests in the otherwise parenchymatous pith. Numerous conifer pollen cones of generally similar morphology also occur at the locality, but have not yet been found attached to other organs of this plant. All are simple cones with adaxially attached clusters of pollen sacs that bear Potonieisporites-type eusaccate prepollen. Assuming that at least some of these cones were produced by this long needled conifer, then the microsporangiate structures of the plant are similar to those of Emporia. This combination of characters is not present in any previously described species of walchian conifers.

Key words: conifer, Late Paleozoic, walchian