| Canada | Manitoba | | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| Canada | New Brunswick | | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| Canada | Newfoundland | | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| Canada | Nova Scotia | | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| Canada | Ontario | | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| Canada | Prince Edward Island | | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| Canada | Quebec | | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| United States | Connecticut | New Haven | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| United States | Delaware | Kent | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| United States | Indiana | Porter | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| United States | Maine | Penobscot | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| United States | Massachusetts | Hampshire | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| United States | Michigan | Presque Isle | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| United States | Minnesota | Saint Louis | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| United States | New Hampshire | Carroll | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| United States | New Jersey | Morris | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| United States | New York | Essex | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| United States | Pennsylvania | Susquehanna | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| United States | Rhode Island | | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| United States | Vermont | Franklin | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| United States | Virginia | | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |
| United States | Wisconsin | Bayfield | Robson, N. K. B. | 1990 | Studies in the genus Hypericum L. (Guttiferae). 8. Sections 29. Brathys (part 2) and 30. Trigynobrathys | Bull. Brit. Mus. (Nat. Hist.), Bot. | 20(1): 1–151 |