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CCDB → Angiosperms → Compositae → Helianthus → Helianthus nuttallii subsp. rydbergii (Britton) R. W. Long
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| ! | Helianthus nuttallii subsp. rydbergii (Britton) R. W. Long | Helianthus nuttallii subsp. rydbergii (Britton) R. W. Long | 17 | IPCN66 | Long 1966b |