- Herbarium ID: SSMF
- Accession Number: 009599
- Scientific Name: Ambrosia psilostachya DC.
- Family Name: Asteraceae
- Location: CNR spur line to brick works at Rosslyn Village, Paipoonge Twp., 2 km W of Thunder Bay City, Ontario.
- District Located: not specified
- Longitude/Latitude: 89.36666W / 48.36666 N
- Habitat: Along railway right-of-way through sandy soil, this going right up to ballast bed despite heavy application of weed killer.
- Notes: [no data]
- Collector: C.E. Garton
- Collection Number: 19138
- Collection Date: 08/28/1979
- Determined by: C.E. Garton
- Annotation by: [no data]