Carya (Juglandaceae)

Carya texana
Genus Carya L.J.Grauke

Carya alba

Carya alba

Large deciduous trees with single trunks and upright cylindrical crowns. Leaves odd-pinnately compound with lanceolate to obovate leaflets with serrate edges. Male flowers in catkins, female flowers in spikes. Fruit (pecan) thin shelled, enclosed in a husk.

Pollen light micrograph:
Pollen grains triporate, psilate - scabrate, spherical - oblate to slightly triangular, 40 - 45 Ám. Pores slightly annualate, without operculum, often displaced to one hemisphere (isopolar). Wall thickness uneven.

Pollen scanning electron micrograph (SEM)
Sculpture varies from psilate to scabrate.

Production and Dispersal:
Heavy production but moderate to poor dispersal.

Good preservation.

Fossil Occurrence:
Earliest fossils date to the late Cretaceous (135 Ma), becomming abundant in the Oligocene (35 Ma).

    Fredericksen, N. O. and R. W. Christopher. 1978.
    Taxonomy and biostratigraphy of late Cretaceous and Paleogene Triatriate pollen from South Carolina. Palynology 2:113­145.

    Nichols, D. J. and H. L. Ott. 1978.
    Biostratigraphy and evolution of the Momipites - Caryapollenites lineage in the early Tertiary in the Wind River Basin, Wyoming. Palynology 2:93­112.


Owen K. Davis 04/00