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Kendall County (IL) Forest Preserve District Rough Pigweed (Rough Amaranth) The
non-native (South Am.) Rough Pigweed is very common
in our area. This weed typically occurs in full sun and slightly moist loamy soil
with high nitrogen content. It prefers highly disturbed areas including
cropland, farm lots and waste areas. This summer annual
is 1-3' tall and usually unbranched. The alternate smooth oval-shaped leaves
are up to 6" long and 4" across with long petioles.
The central stem terminates in a stout panicle (up
to 6" long) of spikes with whitish-green flowers. Shorter flower spikes
occur at the axils
of the upper leaves.
Rough Pigweed along Minkler Road August 26, 2013 Each flower is later replaced by a seed that is contained in a bladder-like membrane (utricle) which becomes tan and splits apart to release the seed.
Rough Pigweed along Minkler Road August 26, 2013
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