| Author | (S. Watson) Fernald | |
| Distribution | Weakley (2020) now considers this taxon as a valid variety. Restricted to the Mountains. It may occur in other counties than we have mapped.
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| Abundance | Rare; the NC NHP lists this variety with a State Rank of S1, and it is State Endangered. | |
| Habitat | Mostly in wet meadows and bogs -- moist sunny ground. | |
| Phenology | Blooms from July to early September; fruits from August to October. | |
| Identification | As the varietal name implies, this is indeed a robust form of the typical S. gramineum. It has "Stem 7-15 mm in diameter; plants 12-20 dm tall; tepals 5-10 mm long; capsules 9-10 mm long; seeds 5-8 mm long" (Weakley 2020). | |
| Taxonomic Comments | Weakley (2018) had subsumed this variety completely within the full species, though many if not most references do recognize this as a legitimate variety, if not as a full species.
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| Other Common Name(s) | | |
| State Rank | S1 | |
| Global Rank | G4T3 | |
| State Status | E | |
| US Status | | |
| USACE-agcp | | |
| USACE-emp | | |
