Flower, Weed
stiff goldenrod
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.
Oblanceolate
White
Surface covered with strong longitudinal ribs.
There is an indentation below the pappusPappus:
Modified calyx in Asteraceae, composed of hairs, bristles, awns, or scales. The pappus-like structure attached to milkweed seeds is termed a coma. 
crown.
Some brown coloration may be seen in creases between the large ribs.
Not listed
Not included
Asteraceae
Oligoneuron rigidum (L.) Small var. rigidum
Oligoneuron grandiflorum (Raf.) Small
Solidago grandiflora Raf.
Solidago rigida L.
Solidago rigida L. var. rigida
