- Herbarium ID: NHIC
- Accession Number: MJO72348
- Scientific Name: Helianthus nuttallii subsp. rydbergii (Britton) R.W. Long
- Family Name: Asteraceae
- Location: Abandoned Canadian National Railway (CNR), approx. 9.5 km SE of Hwy 599, S of Unaka Lake, Ont.
- District Located: Kenora
- Longitude/Latitude: 91.07972W / 49.70667 N
- Habitat: Railway embankment.
- Notes: Flowering; small patch; see P.W. Ball e-mail of 30 Sept. 2004.
- Collector: M.J. Oldham & W.D. Bakowsky
- Collection Number: 27777
- Collection Date: 17-Aug-2002
- Determined by: M.J. Oldham
- Annotation by: P.W. Ball 24 (+ var. det).