Eryngium lanceolatum

Eryngium lanceolatum is a perennial herb with erect stems that may be unbranched below and more extensively branched above, though robust individuals can be branched throughout. Mid-stem leaves are relatively large and deltate-lanceolate, typically widest near the base. Leaf margins are regularly serrate to dentate, often with numerous teeth, and may become spinose-serrate toward the upper portions of the plant. The inflorescences consist of multiple hemispherical flower heads subtended by spiny bracts. The species is distinguished within the Eryngium integrifolium complex by its relatively large leaves, erect growth form, and consistently serrate leaf margins. ==Taxonomy==

Eryngium lanceolatum was originally described as Eryngium integrifolium var. lanceolatum by H. Wolff in 1913. It was elevated to species rank in 2024 by Kees, Weakley, and Poindexter following a taxonomic revision of the Eryngium integrifolium complex, which recognized multiple distinct species based on morphological and geographic differentiation. ==Distribution and habitat==

The species is endemic to the inner West Gulf Coastal Plain and is loosely associated with the Carrizo Sand formation and the Post Oak Savannah ecoregion. It occurs in specialized wet habitats, including muck bogs within post oak or oak–pine woodlands, as well as forested seepages and wet terraces. ==Ecology==

Eryngium lanceolatum occupies seasonally wet, sandy substrates within fire-influenced ecosystems of the West Gulf Coastal Plain. Its occurrence in boggy depressions and seepage habitats suggests adaptation to fluctuating hydrologic conditions. ==Similar species==

Eryngium lanceolatum is part of the Eryngium integrifolium species complex. It differs from E. altamaha in having larger mid-stem leaves and a more erect growth form, and from E. ludovicianum in its broader leaves and more regularly serrate margins. ==Conservation==

Because it is restricted to a relatively narrow geographic region and specialized habitats, Eryngium lanceolatum may be vulnerable to habitat alteration, particularly drainage, land conversion, and changes in fire regimes affecting Coastal Plain ecosystems. ==Identification==

Within the Eryngium integrifolium species complex, Eryngium lanceolatum can be distinguished by: • Leaves relatively broad (generally wider than in E. ludovicianum) • Margins with more numerous and closely spaced teeth • Occurrence in the inner West Gulf Coastal Plain, often associated with the Carrizo Sand formation It differs from: • Eryngium ludovicianum — narrower leaves with fewer teeth and a more southern distribution • Eryngium mississippiense — more robust habit and broader eastern distribution • Eryngium altamaha — restricted to the Altamaha River region of Georgia ==See also==