Eryngium integrifolium

This record represents the narrow concept of Eryngium integrifolium following Kees et al. (2024). Kees et al. (2024), which is followed by Weakley et al. (2025), split E. integrifolium into five species, based on a morphometric analysis as well as ecological and biogeographic evidence. Taxa recognized by Kees et al. (2024) are: E. altamaha, E. integrifolium (with 3 varieties: var. integrifolium, var. maficolum, var. piedmontanum), E. lanceolatum, E. ludovicianum, and E. mississippiense. This narrow sense of E. integrifolium, following Kees et al. (2024), is restricted to the outer Atlantic and Gulf coastal plains and inland bogs and seeps of the Blue Ridge and Piedmont (Alabama, Florida, Georgia, Mississippi, North Carolina, and South Carolina). In contrast, Kartesz (1994) and FNA (vol. 13, 2024) treat Eryngium integrifolium in a broader sense that extends to plants in Arkansas, Kentucky, Louisiana, Oklahoma, Tennessee, Texas, and Virginia.

Eryngium integrifolium is a wide-ranging perennial herb found in bogs and seeps, including pitcherplant bogs, hillside seepage bogs, sandhill-pocosin ecotones, and occasionally roadside ditches in longleaf pinelands. It is endemic to the southeastern United States from southeastern Virginia and western North Carolina south to northeastern Florida west to southwestern Georgia and the Florida Panhandle to southeastern Louisiana. There are over 300 occurrences, which face threats from development, road maintenance, logging, hydrological alteration, and invasive species. Little is known about trends, but with a large range extent and large number of occurrences, this species is considered secure.

Eryngium integrifolium is endemic to the southeastern United States from southeastern Virginia and western North Carolina south to northeastern Florida west to southwestern Georgia and the Florida Panhandle to southeastern Louisiana (Kees et al. 2024, Weakley and the Southeastern Flora Team 2025). Range extent was estimated to be over 500,000 square kilometers using herbarium specimens and photo-based observations documented between 1994 and 2025 (RARECAT 2025, iNaturalist 2026, SEINet 2026).

By applying a 1 km separation distance to herbarium specimens and photo-based observations documented between 1994 and 2025, it is estimated that there are over 300 occurrences rangewide (RARECAT 2025, GBIF 2026, iNaturalist 2026, SEINet 2026).

Although threats are not widely documented, this species is potentially threatened by stressors, including development, road maintenance, logging, hydrological alteration, and invasive species, though there is insufficient data, including anecdotal accounts, to understand scope and severity of threats for this species rangewide.