Helminthotheca echioides
Gerald D. Carr

Flora of Oregon

Plants 10–100+ cm.

Leaves 5–25 cm.

calyculi 5, ovoid to deltate.

Involucres 12–15 mm.

Phyllaries abaxially bristly.

Florets 20–40+; ligules 15–20 mm, yellow, often reddish abaxially.

Fruits bodies 2.5–3 mm, reddish brown or outermost pale tan; beaks 2.5–4 mm.

2n=10.

Roadsides, disturbed areas. Flowering Jun–Sep. 0–600 m. CR, Sisk, WV. CA; widely scattered in North America; Europe. Exotic.

This species’ roadside habit may encourage further spreading to other parts of the state.

Flora of North America

as described under Helminthotheca echioides

Leaf blades 50-150(-250) × 10-50(-80+) mm. Peduncles 1-5+ cm, bristly hispid. Calyculi: bracts 9-15+ × 3-5+ mm, margins and tips bristly-ciliate. Phyllaries often sigmoid in fruit, abaxial faces and tips bristly. Cypselae: bodies 2.5-3 mm, beaks 2.5-5 mm; pappi 4-7 mm. 2n = 10.Flowering May-Nov. Disturbed sites; 0-50(-500) m; introduced; Alta., N.B., Ont., Sask.; Ariz., Calif., Conn., D.C., Iowa, Maine, Md., Mass., Mo., Mont., N.J., N.Y., N.Dak., Ohio, Oreg., Pa., Vt., Va.; Europe; widely introduced elsewhere.Reports for British Columbia and Nova Scotia need confirmation.

Photo images

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Herbarium specimens

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