6. Eryngium Hookeri Walp. Fig. 599. 



Plants slender, caulescent, glabrous, 3-6 dm. high, annuals from fascicled 

 fibrous roots, the erect stems solitary and branched above; basal leaves obovate 

 to oblong-lanceolate, 6-9 cm. long, 2-3 cm. wide, acute, somewhat serrate or 

 dentate, the venation reticulate; petioles slender, sheathing at the base; lower 

 cauline leaves nearly sessile, lanceolate, laciniately toothed and spinulose with a 

 pair of small laciniate segments at the base; upper cauline leaves ovate, palmately 

 divided with 5 to 7 oblong laciniate or pinnatifid spinulose lobes 2-3 cm. long; 

 inflorescence cymosely branched, the pedunculate heads rather large, the flowers 

 numerous; heads amethystine, ovoid to cylindric-ovoid, 8-15 mm. in diameter; 

 bracts numerous, rigid, linear-lanceolate, 1-2 cm. long, spinulose-serrate, broadly 

 winged at the base, exceeding the heads; bractlets lanceolate, 4-6 mm. long, 

 pungent, entire, exceeding the fruit; coma of a few elongate bractlets or wanting; 

 sepals ovate-lanceolate, 2 mm. long, pungent-acuminate; styles shorter than the 

 sepals; fruit 1-2 mm. long, densely covered with flat tawny scales to 0.5 mm. 

 long. 



In moist or wet limy soil in the Coastal and Blackland prairies of Tex., July- 

 Sept.; also La. 



7. Eryngium integrifolium Walt. Fig. 600. 



Plants slender, caulescent, glabrous, 3-8 dm. high, perennial from a fascicle 

 of tuberous or fleshy-fibrous roots, the erect stems solitary and branching above; 

 basal leaves oblong-lanceolate to oblong-ovate, to 6 cm. long and 2.5 cm. wide, 

 usually cordate at the base, obtuse, entire to shallowly crenate, the venation 

 reticulate; petioles sheathing at the base, lower cauline leaves like the basal but 

 short-petiolate to sessile, the uppermost leaves linear to oblanceolate or ovate, 

 acute, usually spinulose-serrate or rarely laciniate or subentire; inflorescence 

 branched, the pedunculate heads rather small, the flowers numerous; heads 

 amethystine, ovoid to globose, 5-15 mm. in diameter; bracts 6 to 10, rigid, linear, 

 1-2 cm. long, entire or usually with 3 to 5 spiny teeth, exceeding the heads; 

 bractlets tricuspidate, 3 mm. long, exceeding the fruit; coma lacking; sepals 

 lanceolate, 1-1.5 mm. long, mucronate; 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. 



In moist woods and bogs in Okla. {Waterfall) and in the Timber Belt and the 

 Coastal and Blackland prairies of Tex., Aug.-Oct.; from N.C., s. to Fla. and w. 

 to Tex. and Okla. 



8. Eryngium nasturtiifolium Juss. Hierba del sapo. 



Plants prostrate, ascending or rarely erect, 1-3 dm. high or long, glabrous, 

 biennial or perennial from a fascicle of fibrous roots or a slender taproot, the 

 leafy stems several and branched from the base; basal leaves spatulate to oblanceo- 

 late, to 10 cm. long, 1-3 cm. wide, cuneate, coarsely dentate to runcinate- 

 pinnatifid, the teeth or lobes mucronulate or spinose, the venation reticulate; 

 petioles broad, winged; cauline leaves like the basal, spinose-dentate or spinose 

 pinnatifid; inflorescence divaricately trifurcate or cymose, the lateral branches 

 often elongated and continuous to form a monochasium, the small heads numerous 

 and nearly sessile, the flowers numerous; heads ovoid to ovoid-cylindric, to 15 

 mm. long and 8 mm. broad; bracts 5 to 9, rigid, spreading, subulate to linear- 

 lanceolate, 8-20 mm. long, entire, pungent, about equaling the heads; bractlets 

 lanceolate to obovate, 4-9 mm. long, broadly scarious-margined at the base, 

 entire, exceeding the fruit; coma of several short bractlets 3-7 mm. long, resem- 

 bling the bracts; sepals ovate, 1-1.5 mm. long, obtuse or acute, mucronulate, serru- 



1260 



