622 



AMiMIACEAE. 



Vol. II. 



2. Eryngium virginianum Lam. 

 ginian Eryiigo. Fig. 3097. 



E. virginianum Lam. Encycl. 4: 759. 1797 



Stem slender, erect, glabrous, branched 

 above, striate, i-3 high. Upper stem-leaves 

 linear, acuminate, sessile and clasping at the 

 base, 2'-8' long, spiny-toothed or rarely lacin- 

 iate, reticulate-veined; basal and lower leaves 

 long-petioled, the blade linear-oblong, often 

 obtuse, entire, or remotely denticulate ; heads 

 subglobose, A"-y" long, equalling or shorter 

 than the lanceolate 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 Flor- 

 ida, west to Texas. July-Sept. 



I. Eryngium aquaticum L. Rattlesnake- 

 master, liuttun Snakeroot. Fig. 3096. 



Eri'ngiuin aqualicum L. Sp. PI. 232. 1753- 



E. yuccaefoliiiiii Michx. Fl. Bor. Am. i : 164. 1803. 



Stout, 2-6 high, glabrous ; stem sriate, simple, or 

 branched above. Leaves elongated-linear, acuminate 

 at the apex, mostly clasping at the base, tinely 

 parcllel-veined, the lower sometimes 3 long and li' 

 wide, the upper smaller, all with bristly margins, the 

 bristles rather distant ; heads stout-peduncled, globose- 

 ovoid, 6"-io" long, longer tlian the ovate or lanceo- 

 late cuspidate bracts ; bractlets similar to the bracts 

 hut smaller; calyx-lobes ovate, acute; fruit scaly, 

 about l" long. 



In wet soil or upland, Connecticut to New Jersey, 

 Illinois, South Dakota-, Florida, Kansas and Texas. 

 The name aquaticum is properly applied to this species, 

 ascertained by a study of the Linnaean type specimen. 

 June-Sept. Water-eryngo. Corn-snakeroot. Rattlesnake- 

 flag or -weed. 



Vir- 



3. Eryngium Leavenworthii T. & G. 



Leavenworth's Krvngo. Fig. 3098. 



E. LcavcnTcorthii T. & G. Fl. N. A. i : 604. 1840. 



Stout, glabrous, i-3 high, branched above. 

 Stem-leaves sessile, or somewhat clasping at the 

 base, palmately pinnatifid into narrow spiny- 

 toothed segments ; basal and lowest leaves ob- 

 lanceolate, mostly obtuse, spinose-denticulate ; 

 heads pedunclcd. ovoid-oblong, i'-2' long, nearly 

 l' thick, equalling or longer than the spinose 

 bracts; bractlets 3-7-cuspidate. those of the upper 

 part of the heads large and resembling the bracts; 

 calyx-lobes pinnatifid, longer than the fruit. 



In dry soil, Kansas and Arkansas to Texas. July- 

 Oct. Briery thistle. 



