SW School of Botanical Medicine
APMRU G. Jones
Plant:"Chenopodium-type (Cushing, 1963)"
"Chenopodiineae (McAndrews in Wright et al., 1963)" and
"Cheno-ams (Martin, 1963)."
The Chenopodiaceae-Amaranthus pollen type includes nearly
all of the species of the family Chenopodiaceae (except Sarcobatus)
and the genera Amaranthus and possibly Acnida in the
Three names have been applied to this pollen-type:
Pollen light micrograph:
The Chenopodiaceae-Amaranthus pollen type
is spherical (elliptical), periporate, and scabrate to
psilate. The number of pores is over 30.
Pollen scanning electron micrograph (SEM)
Small, uniformly-distributed elements can be seen over the
tectum. The pore membrane may have elements.
Production and Dispersal:
Chenopodiaceae-Amaranthus pollen grains are very common,
reaching abundances of over 60%. Both taxa are wind-pollinated
and thier pollen is found far from the parentl plants.
They are well-preserved and
their characteristic appearance leads to easy recognition (and
over-counting) in fossil records.
It is present in late Cretaceous deposits of western Canada (Sravastava, 1968).
Cushing, E.J. 1963.
Late-Wisconsin pollen stratigraphy in east-central Minnesota. Ph.D. Dissertation, Univ. Minnesota, 165 p
Martin, P.S., 1963.
"The Last 10,000 Years." U of Arizona Press.
Sravastava, S.K. 1968.
Assorted angiosperm pollen from the Edmonton Formation (Maestrichtian),
Alberta Canada. Can. J. Bot. 47: 975-989.
Wright, H.E., Jr., Winter, T.C., and Patten, H.L. 1963.
Two pollen diagrams from southeastern Minnesota: Problems in the regional
late-glacial and postglacial vegetational history. GSA Bull. 74: 1371-1396.
Owen K. Davis 12/99