Eryngium integrifolium Walt.

Eryngium integrifolium Walt. Fl. Car. 112. 1788
Eryngium virgatum Lam. Encyc. 4: 757. 1797.
Eryngium ovalifolium Michx. Fl. Bor. Am. 163. 1803.
Eryngium americanum "Walt."; Spreng. in R. & S. Syst. Veg. 6: 337. 1820.
Eryngium ludovicianum Morong, Bull. Torrey Club 14: 51. 1887.
Eryngium virgatum var. ludovicianum Morong; Coult. & Rose, Rev. N. Am. Umbell. 96. 1888.
Eryngium integrifolium var. ludovicianum Coult. & Rose, Contr. U. S. Nat. Herb. 7: 48. 1900.
Eryngium integrifolium var. typicum H. Wolff in Engler, Pflanzenreich 61 (4 228 ): 160. 1913.
Eryngium integrifolium var. lanccolalum H. Wolff, in Engler, Pflanzenreich 61 (4 228 ) : 161. 1913.
Slender, caulescent, glabrous perennials, 3-8 dm. high, from a fascicle of tuberous or fleshy-fibrous roots, the stems solitary, erect, branching above; basal leaves oblong-lanceolate to oblong-ovate, 1.5-6 cm. long, 5-25 mm. broad, often cordate at the base, obtuse at the apex, entire to shallowly crenate, the venation reticulate; petioles sheathing at the base, 1-3 cm. long; lower cauline leaves like the basal but short-petiolate to sessile above, the uppermost linear, oblanceolate to ovate, acute, usually spinulose-serrate or rarely laciniate or subentire; inflorescence branched, the heads few, rather small, pedunculate, the flowers numerous; heads amethystine, ovoid to globose, 5-15 mm. in diameter; bracts 6-10, rigid, linear, 1-2 cm. long, entire or usually with 3-5 spiny teeth, exceeding the heads; bractlets tricuspidate, 3 mm. long, exceeding the fruit; coma wanting; sepals lanceolate, 1-1.5 mm. long, mucronate; petals oblong, about 1 mm. long; styles slender, exceeding the sepals; fruit about 2 mm. long, the angles densely covered with rows of lanceolate white scales 0.5-1 mm. long, the surfaces usually scaleless.
Type locality: Presumably in the Carolinas, Waller.
Distribution: North Carolina to Florida, west to Oklahoma and Texas (Curtiss 6008, Heller &■

Eryngium integrifolium, also known as blueflower eryngo or savanna eryngo, is a flowering plant in the family Apiaceae. It is native to the Southeastern United States where it is found it meadows, savannas, and flatwoods often in wet, nutrient-poor conditions. It produces dense heads of blue flowers in late summer through fall.