Robinia hartwigii Koehne. Common name: Granite Dome Locust, Highlands Locust, Hartwig's Locust. Phenology: Jun-Jul; Aug-Sep. Habitat: Forests and outcrop edges on high elevation granitic domes, also clearings. Distribution: Apparently endemic to a small area around Highlands, NC; also in the Ouachita Mountains of AR, where seemingly native (in remote locations) (T. Witsell, pers.comm., 2023). Material from the SC sandhills is not R. hartwigii (B. Wheeler, pers.comm., 2024).

Origin/Endemic status: Endemic

Taxonomy Comments: While certainly related to and apparently hybridizing with R. viscosa, R. hartwigii seems worthy of recognition as a species; Wheeler (2023) supported species rank. The original spelling (Koehne 1913) is "hartwigii"; it is not clear why the orthographic variants (see synonymy) arose.

Synonymy ⓘ: = RAB, S, Wheeler (2023); = Robinia viscosa Vent. var. hardwegii — Ashe (1922), orthographic variant; = Robinia viscosa Vent. var. hartwegii (Koehne) Ashe, orthographic variant; = Robinia viscosa Vent. var. hartwigii (Koehne) Ashe — K4, NS, SE3, Isely & Peabody (1984), Peabody (1984); < Robinia viscosa Vent. — FNA11.2, POWO, W. Basionym: Robinia hartwigii Koehne 1913

Links to other floras: < Robinia viscosa - FNA11.2

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Heliophily ⓘ: 7