Eutrochium purpureum

Species category

Weed

Common name

sweetscented joe pye weed

Diagnostic characters

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 3–4.1 mm
Width 0.5–0.7 mm
Thickness 0.5–0.7 mm

Color

White

Texture

Rough

Other structures

Four strong longitudinal ribs

Identification notes

Slight indentation below 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. PappusPappus:
Modified calyx in Asteraceae, composed of hairs, bristles, awns, or scales. The pappus-like structure attached to milkweed seeds is termed a coma.
may be present.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Asteraceae

Valid name

Eutrochium purpureum (L.) E.E. Lamont

Synonyms

Eupatorium purpureum L.

Eutrochium purpureum. White achenes with a slight indentation below the pappus crown.

SeedImages