- Herbarium ID: NHIC
- Accession Number: MJO8488
- Scientific Name: Helianthus giganteus L.
- Family Name: Asteraceae
- Location: Approx. 2 km N of Minnesota border and 1 km NW of junction of Hwy 593/597, near Arrow River, Ont.
- District Located: not specified
- Longitude/Latitude: 89.69444W / 48.02611 N
- Habitat: Open ground.
- Notes: Rare, flowering, called Helianthus strumosus by A.A. Reznicek in 1997.
- Collector: M.J. Oldham & W. Bakowsky
- Collection Number: 17718
- Collection Date: 4-Aug-1995
- Determined by: M.J. Oldham
- Annotation by: P.W. Ball 1995.