Chenopodium ambrosioides


SEM, closeup
SEM, spicules

Pollen monads, size class medium, shape spheroidal, diameter 22-34 μm, equatorial outline circular; aperture type perioporate, pores numerous (50-70 or more), pores circular, pore diameter 1-2 μm, ornamentation smooth to finely granulate, minutely scabrate with small conical spicules, exine 2 um thick. tectate, tectum bulging between the pores. Viscin absent.
It is very difficult to separate the species of Chenopodium and Amaranthus.


Pollination Biology:
This species is apparently entirely wind pollinated. It is visited by a number of insects that feed on the plant.
Hayfever plant.

Tropicos Pollen Voucher Specimen:
Yatskievych 89-410

Illinois Wildflowers (Hilty 2010)
USDA Plants – Chenopodium ambrosioides


Species in Missouri:
Chenopodium album L.
Chenopodium ambrosioides L.
Chenopodium berlandieri Moq.
Chenopodium botrys L.
Chenopodium capitatum (L.) Asch.
Chenopodium ficifolium Sm.
Chenopodium glaucum L.
Chenopodium incanum (S. Watson) A. Heller
Chenopodium murale L.
Chenopodium opulifolium Schrad. ex W.D.J. Koch & Ziz
Chenopodium pallescens Standl.
Chenopodium pratericola Rydb.
Chenopodium pumilio R. Br.
Chenopodium rubrum L.
Chenopodium salinum Standl.
Chenopodium simplex (Torr.) Raf.
Chenopodium standleyanum Aellen
Chenopodium urbicum L.
Chenopodium watsonii A. Nelson


Hilty, J. Editor. 2010. Insect Visitors of Illinois Wildflowers. World Wide Web electronic publication., version (04/2010).

McAndrewsa, J.H. and A.R. Swansona. 1967. The pore number of periporate pollen with special references to Chenopodium. Review of Palaeobotany and Palynology 3: 105-117.

Pinar, N.M. and Ö. Inceoglu. 1999. Pollen Morphology of Turkish Chenopodium L. (Chenopodiaceae). Tr. J. of Botany 23: 179-186.