Eryngium diffusum Torr.

Eryngium diffusum Torr. Ann. Lye N. Y. 2: 206. 1827
Eryngium prostralum James; S. Wats. Bibl. Ind. 421, as syn. 1878.
Low, caulescent, diffusely branched, prostrate to erect, glabrous perennials (?), 1-4 dm. high, from a slender taproot; basal leaves obovate to cuneate, 2-5 cm. long, 1-2 cm. broad, nearly sessile, deeply palmately parted, the cuneate or oblong divisions spinulose-dentate or lobed, the venation palmately reticulate; cauline leaves numerous, like the basal; inflorescence successively trifurcate, or some lateral branches elongate to form a monochasium, the heads numerous, small, very short-pedunculate, the flowers numerous; heads bluish, globose-ovoid, 8-12 mm. long, 6-8 mm. broad; bracts 10-12, rigid, spreading, linear-lanceolate, 10-15 mm. long, 2-3 mm. broad, pungent, spinose-serrate, scarious-margined at the base, exceeding the heads; bractlets lanceolate, 5 mm. long, mucronate, entire, broadly scariouswinged at the base, exceeding the fruit; coma wanting; sepals lanceolate, long-mucronate, 3-3.5 mm. long; petals oblanceolate, about 1.5 mm. long; styles shorter than to slightly exceeding the sepals; fruit globose-ovoid, 2.5-3 mm. long, densely covered with linear, acute, subequal, white scales, 1-2 mm. long.
Type locality: On the Canadian River, probably Oklahoma, James. Distribution: Texas and adjacent Oklahoma (Berlandier 107 S. Reverchon 3S52).

Eryngium diffusum là một loài thực vật có hoa trong họ Hoa tán. Loài này được Torr. mô tả khoa học đầu tiên năm 1828.