Weed
cup plant, cupleaf rosinweed, squarestem rosinweed
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
Striate
ApicalApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
end indented.
No pappusPappus:
Modified calyx in Asteraceae, composed of hairs, bristles, awns, or scales. The pappus-like structure attached to milkweed seeds is termed a coma. 
. Margin winged.
Not listed
Not included
Asteraceae
Silphium perfoliatum L.
