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Lanceleaf Ragweed
Ambrosia bidentata Michx.
Asteraceae (Sunflower Family)
▲▼ mature plants
▲ mature plant
▲▼stem, leaves and inflorescences
▲inflorescence detail
Ambrosia bidentata Michx., Lanceleaf Ragweed: (Bayer Code: AMBBI; US Code AMBI2)
· Is a moderately-branched native summer annual weed with upward-bent lance-shaped or narrowly 3-lobed leaves (2-3 feet tall)
· Inflorescence is larger than common ragweed, and has downward-curving bracts between flower clusters in the spike (helps distinguish from annual marshelder, which has upward-pointing bracts between flowers in spike); also allergenic
· Prefers moist soils, but may grow in any fertile soil
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Updated 19 January 2019