| 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. Specimens at herbarium NCU from Jackson and Swain counties are filed with var. robustum, and may be correct, but lack annotations from "gramineum".
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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 | | |
