Weed
Spanish needles
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.
Linear
Black; some small, light brown mottling
Strong longitudinal ribs
Two or three strong, barbed awnsAwn:
A narrow, bristle-like organ, as on the glumes or lemmas of grasses (Poaceae).
Base and apicalApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
ends are lighter-colored. Base with a large ring.
Not listed
Not included
Asteraceae
Bidens bipinnata L.
Bidens bipinnata L. var. biternatoides Sherff
