Growth Duration: Annual
Conservation Status: Not of concern
Pollination: Bees, flies, beetles, wasps
[none provided]
PNW Herbaria: Specimen records of Helminthotheca echioides in the Consortium of Pacific Northwest Herbaria database.
WA Flora Checklist: Helminthotheca echioides checklist entry.
OregonFlora: Helminthotheca echioides information.
E-Flora BC: Helminthotheca echioides atlas page.
CalPhotos: Helminthotheca echioides photos.
USDA Plants: Helminthotheca echioides information.