Western Ragweed

Plant Profile
FYUSE 3d Image	Common Name: Western Ragweed Species Name: Ambrosia psilostachya Plant Type: Forb Family Name: Asteraceae, Sunflower Family

Plant Facts
Origin	Native
Duration	Perennial
Distribution in the U.S.	Across the continent except the Rocky Mountains and East-Central States
Distribution in Oklahoma	Across the state

ID Characteristics

Field Identification Characteristics
Vegetative
- Gray-green foliage with coarse texture
- Leaves directly attached to stem; narrow with many pointed lobes
- Similar to Sagewort but lacks the bright silvery underleaf contrast
Floral
- Columns of small green flower heads
Leaf and Stem Characteristics
- Leaf Type: Simple
- Leaf Arrangement: Opposite at lower nodes; alternate at upper
- Leaf Shape: Deeply lobed
- Stipules: Absent
Floral Characteristics
- Flower Color:Greenish-yellow to yellowish-white
- Flower Timing: July-September
- Fruit Type: Achene

Habitat/Ecology
Soil Type	All
Habitat	Prairie, woodlands, urban areas; density increasing with disturbance
Successional Stage	Mid to late