Dittrichia graveolens (stinkweed)

The invasive stinkweed, Dittrichia graveolens, was not even mentioned in the 1993 Jepson Manual because it had not been recognized as a non-native. Any reports existing then were of the opinion that it was some sort of tarplant.
Now it is a serious menace, starting to spread along highways and into rancher’s fields.
The California Invasive Plant Council (Cal-IPC) indicates that it “can form dense stands in late summer/early fall with few plant competitors. It grows rapidly late in the year from small rosette to over 1meter tall in open, disturbed, riparian, non-native grasslands, and sites which may include some native species.”
More information can be found at the following links.

California Invasive Plant Council (Cal-IPC)
Invasive Species Early Detection Program (ISED)

Click on each image to see a larger version.

Dittrichia graveolens IMG 4575sm Dittrichia graveolens IMG 4573sm
Dittrichia graveolens (stinkweed) Dittrichia graveolens (stinkweed)

Dittrichia graveolens IMG 4540sm









               Dittrichia graveolens (stinkweed)

Photos by Vernon Smith