Flower, Weed
bluemink
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 or gray
Ribs longitudinal. Fine reticulations.
PappusPappus:
Modified calyx in Asteraceae, composed of hairs, bristles, awns, or scales. The pappus-like structure attached to milkweed seeds is termed a coma. 
with five to six scales.
Base white and enlarged.
Not listed
Not included
For more information, see ISMA fact sheet.
Asteraceae
Ageratum houstonianum Mill.
