Planting unit

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.

Shape

Oblanceolate

Size

• Length 1.5–3 mm 
• Width 0.8–1 mm 
• Thickness 0.8–1 mm 

Color

Dark gray 

Texture

Longitudinal ribs few with fine intermediate striations

Other structures

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 at apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
is full width of the 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.
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Family

Asteraceae

Valid name

Rudbeckia subtomentosa Pursh