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

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

(Updated January 19, 2019)