BioStor
 | Description of a new species of Hybopsis (Hybopsis montanus) S E Meek (1885) Proceedings of the United States National Museum 7: 526-527 |
 | Contributions to the history of the Commander Islands. No. 4. A. Notes upon the plants collected on the Commander Islands (Bering and Copper Islands) by Leonhard Stejneger Asa Gray (1885) Proceedings of The United States National Museum 7: 527-529 |
 | Flora of the Prairie Provinces B Boivin (1967) Phytologia 15: 329-446 |