Flower, Weed
tanseyleaf tansyaster
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.
Light yellow
Striate and granular and with sparse short hairs
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 is within the margin line.
PappusPappus:
Modified calyx in Asteraceae, composed of hairs, bristles, awns, or scales. The pappus-like structure attached to milkweed seeds is termed a coma. has a tendency to remain attached.
Not listed
Not included
Asteraceae
Machaeranthera tanacetifolia (Kunth) Nees
Aster tanacetifolius Kunth
Machaeranthera coronopifolia (Nutt.) A. Nelson
Machaeranthera parthenium Greene
