Helminthotheca echioides
Folia Geobot. Phytotax. 8: 176. 1973.
Basionym: Picris echioides Linnaeus Sp. Pl. 2: 792. 1753
Treatment appears in FNA Volume 19. Treatment on page 300.
Revision as of 20:19, 16 December 2019 by FNA>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
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.