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Western Ragweed
Ambrosia psilostachya DC.
Asteraceae (Aster Family)
▲ ▼ young sprouts from creeping roots
▲ ▼ immature plants
▲ ▼ mature plants
▲ ▼ inflorescences
▲ inflorescence showing male flowers and pollen
▲ ▼ creeping roots
▲ ▼ creeping roots
Ambrosia psilostachya DC., Western Ragweed: (Bayer Code: AMBPS; US Code AMPS)
· A creeping perennial weed, with creeping roots; more common west of here; is a noxious weed in some western states
· Has leaves similar to common ragweed, but stems and leaves are thicker, more rough-textured than common ragweed
· Inflorescence/flowers similar to common ragweed
· Grows 12-36 inches tall, found in most soils except very wet
· Common in vacant lots, roadsides, pastures
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Updated 19 January 2019