Eryngium pilularioides Hemsl. & Rose

Eryngium pilularioides Hemsl. & Rose; Rose, Contr. U. S. Nat Herb. 8:333. 1905.
Low, acaulescent or short-caulescent, glabrous perennials, 10-15 cm. high or long, from a stout taproot, the stems slender, elongate, procumbent, stoloniferous; leaves of 2 or 3 kinds, all fistulose to more or less flattened and often septate, linear, acute or obtuse, 1-8 cm. long, 1 mm. or less broad, fascicled, spinose-ciliate near the base, the venation parallel; sheaths scarious-margined, short, vaginate; inflorescence an elongated monochasium bearing numerous sessile or short-pedunculate, small heads, the flowers few; heads globose to globose-ovoid, 3-5 mm. in diameter; bracts 6-8, rigid, ascending, linear-lanceolate, pungent, entire, exceeding the heads; bractlets like the bracts, entire, scarious-winged at the base, slightly exceeding the fruit; coma wanting; sepals ovate, about 1 mm. long, acuminate, apiculate, scarious-margined; petals oblong, about 1 mm. long; styles equaling or shorter than the sepals; fruit subglobose, 1-2 mm. in diameter, densely covered with lanceolate, acuminate, flat, subequal white scales 0.5 mm. long.
Type locality: Shallow hollows of meadows near Buena Vista Station, eastern Hidalgo, Pringle S94S.
Distribution: Known only from the type locality.