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Of the amaranth family (Amarantaceae): left, pigweed (Amarantus retroflexus); right, Tumble Weed (Amarantus graecizans).

Pigweed and Tumble Weed

Of the amaranth family (Amarantaceae): left, pigweed (Amarantus retroflexus); right, Tumble Weed (Amarantus…

Shown are the Aristolochiaceae, Polygonaceae, Chenopodiaceae, and Amarantaceae orders. Also illustrated are the asarum, aristolochia, fagopyrum, chenopodium, and achyranthes flowers of these orders.

Aristolochiaceae, Polygonaceae, Chenopodiaceae, and Amarantaceae Orders

Shown are the Aristolochiaceae, Polygonaceae, Chenopodiaceae, and Amarantaceae orders. Also illustrated…