UMBELLIFEREAE. [Vou. II. 
1. Eryngium aquaticum L. Rattlesnake- 
master. Button Snakeroot. (Fig. 2660.) 
Eryngium aquaticum 1, Sp. Pl. 232. 1753. 
tae yuccacfolium Michx. Fl. Bor. Am. 1: 164. 
Stout, 2°-6° high, glabrous; stem striate, simple, 
orbranched above. Leaves elongated-linear, acum- 
inate at the apex, mostly clasping at the base, 
finely parallel-veined, the lower sometimes 3° long 
and 114’ wide, the upper smaller, all with bristly 
margins; heads stout-peduncled, globose-ovoid, 
6’/-10’’ long, longer than the ovate or lanceolate 
cuspidate bracts; bractlets similar to the bracts but 
smaller; calyx-lobes ovate, acute; fruit scaly, about 
1’ long. 
In wet soil or upland, pine-barrens of New Jersey to 
Illinois and Minnesota, south to Florida, Missouri and 
Texas. June-Sept. 
2. Eryngium Virginianum Lam. 
Virginian Eryngo. (Fig. 2661.) 
E. Virginianum Yam. Encycl. 4:759. 1797- 
Stem slender, erect, glabrous, branched 
above, striate, 1°-3° high. Upper stem- 
leaves linear, acuminate, sessile and clasp- 
ing at the base, 2/-8’ long, spiny-toothed 
or rarely laciniate, reticulate-veined; basal 
and lower leaves long-petioled, the blade 
linear-oblong, often obtuse, entire, or re- 
motely denticulate; heads subglobose, 4’’— 
7// long, equalling or shorter than the lan- 
ceolate spiny-toothed or entire reflexed 
bracts; bractlets usually 3-cuspidate with 
the middle cusp longest; calyx-lobes lan- 
ceolate, cuspidate; fruit scaly. 
In marshes near the coast, New Jersey to 
Florida, west to Texas. July-Sept. 
3. Eryngium Leavenworthii T. & G. 
Leavenworth’s Eryngo. (Fig. 2662.) 
Eryngium Leavenworthti T. & G. Fl. N. A. 1: 604. 
1540. 
Stout, glabrous, 1°-3° high, branched above. 
Stem-leaves sessile, or somewhat clasping at the 
base, palmately pinnatifid into narrow spiny- 
toothed seginents; basal and lowest leaves ob- 
lanceolate, mostly obtuse, spinose-denticulate; 
heads peduncled, ovoid-oblong, 1/-2/ long, 
nearly 1/ thick, equalling or longer than the 
spinose bracts; bractlets 3-7-cuspidate, those of 
the upper part of the heads large and resem- 
bling the bracts; calyx-lobes pinnatifid, longer 
than the fruit. 
In dry soil, Kansas, to Texas. July—Oct. 
