redroot pigweed การใช้

• Ragweed is the major culprit, but other important sources are sagebrush, redroot pigweed, lamb's quarters, Russian thistle ( tumbleweed ), and English plantain.
• The two may be distinguished by the number of lobes on the bracts; the latter has 9-15 lobes whereas the former has only 5-9 . " Acalypha rhomboidea " also resembles young redroot pigweed ( " Amaranthus retroflexus L . " ), but may be distinguished from the latter by the flower clusters, bracts, and occasionally bronze-green leaves of the former.