Weed
Cuman ragweed
AcheneAchene:
A dry, hard, one-chambered, one-seeded indehiscent fruit, as in buckwheat (Fagopyrum) or sunflower (Helianthus). The fruit wall is not united with the seed coat.
ObovateObovate:
Inverted egg shaped with apical end the broadest.
Brown
Moderately smooth with some apicalApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
pubescence
Blunt terminal point and circle points
Seed type is best described as an acheneAchene:
A dry, hard, one-chambered, one-seeded indehiscent fruit, as in buckwheat (Fagopyrum) or sunflower (Helianthus). The fruit wall is not united with the seed coat. enclosed in an involucreInvolucre:
A number of bracts (often leaf-like) that subtend an inflorescence such as the head in sunflowers.
. Closely resembles A. artemisifolia but is somewhat larger, and the terminal end is less pointed. The basalBasal:
The base of the fruit or seed opposite the apical end.
end is thicker and blunter.
State Noxious Weed: Hawaii, Idaho, Washington, Wyoming
Not included
For more information, see ISMA fact sheet.
Asteraceae
Ambrosia psilostachya DC.
Ambrosia californica Rydb.
Ambrosia coronopifolia Torr. & A. Gray
Ambrosia cumanensis auct. non Kunth
Ambrosia psilostachya DC. var. californica (Rydb.) S.F. Blake
Ambrosia psilostachya DC. var. coronopifolia (Torr. & A. Gray) Farw. Ambrosia psilostachya DC. var. lindheimeriana (Scheele) Blank.
Ambrosia rugelii Rydb.
