Weed
great 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
Smooth and ribbed
Terminal spine surrounded by a ring of blunt spines.
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.
. Largest of the ragweeds. Varies in size.
State Noxious Weed: California, Delaware, Hawaii, New Jersey, Wisconsin
Included
For more information, see ISMA fact sheet.
Asteraceae
Ambrosia trifida L.
