Flower, Weed
blue mistflower
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.
Conical
Black
Strong longitudinal ribs
Surface between the ribs is reticulatedReticulated:
Resembling a net or network, especially having veins, fibers, or lines crossing the surface.
.
PappusPappus:
Modified calyx in Asteraceae, composed of hairs, bristles, awns, or scales. The pappus-like structure attached to milkweed seeds is termed a coma. 
ring is white with some retained pappusPappus:
Modified calyx in Asteraceae, composed of hairs, bristles, awns, or scales. The pappus-like structure attached to milkweed seeds is termed a coma. hairs.
Not listed
Not included
Asteraceae
Conoclinium coelestinum (L.) DC.
Eupatorium coelestinum L.
