Helminthotheca echioides
Folia Geobot. Phytotax. 8: 176. 1973.
IntroducedIllustrated
Basionym: Picris echioides Linnaeus Sp. Pl. 2: 792. 1753
Treatment appears in FNA Volume 19. Treatment on page 300.
Revision as of 19:51, 5 November 2020 by imported>Volume Importer
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.
Phenology: Flowering May–Nov.
Habitat: Disturbed sites
Elevation: 0–50(–500) m
Distribution
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.
Discussion
Reports for British Columbia and Nova Scotia need confirmation.
Selected References
None.
Lower Taxa
None.