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Your search found 11 taxa.
Small, white, rounded cloverlike clusters of tiny flowers are 0.5-0.7" wide, per A Field Guide for the Identification of Invasive Plants in Southern Forests.
Inflorescences 2-4cm in flower, elongating to 21cm in fruit, per Flora of North America.
Inflorescences moderately large, usually soft and lax, with spreading branches, per Weakley's Flora.
Simple or compound terminal staminate spikes, usually green to silvery green, per Flora of North America.
This annual is alleged to reach a size of 9m tall & 30cm diameter at the base, per Weakley's Flora.
The inflorescences are axillary, congested clusters, per Flora of North America.
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