Genus: Helianthus — sunflower
Natural variation and hybridization among species make Helianthus a difficult genus. Observation of small flower and fruit parts are necessary. You will need a good hand lens and a ruler with millimeter divisions in order to use this key. Reference: Schilling (2006).
Family
This genus’s species in New England
- Helianthus annuus
- Helianthus debilis
- Helianthus decapetalus
- Helianthus divaricatus
- Helianthus giganteus
- Helianthus grosseserratus
- Helianthus hirsutus
- Helianthus maximiliani
- Helianthus microcephalus
- Helianthus mollis
- Helianthus occidentalis
- Helianthus pauciflorus
- Helianthus petiolaris
- Helianthus strumosus
- Helianthus tuberosus
Visit this genus in the Dichotomous Key