Carya (Juglandaceae)


Carya texana
Genus Carya L.J.Grauke


Carya alba
G.Jones APMRU


Carya alba
G.Jones APMRU

Plant:
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.

Preservation:
Good preservation.

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

References:
    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.

Links

Owen K. Davis 04/00