Eryngium altamaha

Eryngium altamaha is a perennial herb with slender, often flexuous stems that branch diffusely from near the base. Mid-stem leaves are typically 2.3–3.5 cm long and bear prominent spinose teeth, especially toward the base. The species produces hemispherical flower heads subtended by spiny bracts, characteristic of the genus. It can be distinguished from closely related species by its relatively small mid-stem leaves, strongly toothed margins, and diffuse, branching growth form. ==Taxonomy==

The species was described in 2024 by Kees, Weakley, and Poindexter as part of a revision of the Eryngium integrifolium complex, which recognized multiple distinct taxa previously treated under a broader species concept. ==Distribution and habitat==

Eryngium altamaha is endemic to Georgia in the southeastern United States. It occurs in Coastal Plain habitats, including wet pine savannas, seepage slopes, and other open, seasonally moist environments. ==Similar species==

Eryngium altamaha is most closely related to other members of the Eryngium integrifolium complex. It differs from E. lanceolatum in having smaller mid-stem leaves and diffusely branching stems, and from E. ludovicianum in its broader leaves and more strongly developed spinose teeth. ==Conservation==

Due to its restricted geographic range, Eryngium altamaha may be vulnerable to habitat loss. Formal conservation assessments are still limited following its recent description. ==Identification==

Within the Eryngium integrifolium species complex, Eryngium altamaha can be distinguished by: • Narrow endemic distribution in the Altamaha River basin of Georgia • Occurrence in Altamaha Grit and associated riverine or seepage habitats • Morphology similar to related species but geographically isolated It differs from: • Eryngium ludovicianum — broader Gulf Coastal Plain distribution and narrower leaves • Eryngium lanceolatum — western distribution in Texas, Oklahoma, and Louisiana • Eryngium mississippiense — wider eastern distribution and generally more robust habit ==See also==