94 



the lower ones sometimes hecoiniii;^ 2 or '■'> feet lon<j;-: heads pedun- 

 culate, ovate-globose ( i) lines long), with ox a'.e-lanceolate mostly 

 entire cuspidate-tipped bracts shorter th;.n the head, and similar 

 bractlets: fruit scaly, about a line long, with short o\ate calyx- 

 lobes, and long rigid styles. — £. aqiiatinon Linn., in part. 



Dry or damp soil, from New Jersey to Florida, and vrestward In Min- 

 nesota, Missouri, and Texas. Fl. July to September. 



Exceedingly variable in lieiglit and size of leaves. 



Var. synchaetum (jra}' in herb. vSmaller, with leaves more 

 bristly margined, and bristles in clusters of 2 to 4. 



Florida (C/(a/j //Iff I), Curli».s. Paimrv). Louisiana, near New Orleans 

 (7)/-. Ingullx, in 1S35"). 



2. E. longifolium Cav. Ann. ii. 188. .Stem dichotomously 

 branching: radical leaves (sometimes 8 or 4 feet long) parallel- 

 veined, linear, tapering to a point, entire or rarely with 1 or 2 

 bristle-teeth; stem leaves similar but shorter: heads oval, with 

 much shorter linear-lanceolate bracts and similar bractlets. 



A Mexican species, collected in this country only by Wright, in 1S51, 

 at "Las Playas Springs, near the Sierra de los Animos," New Mexico, 

 October. 



The original description calls for retlexed bracts, but Wright's speci- 

 mens show no such character. 



* * Tall and often stout: leaves thick, linear to oblongs on 

 long Jistiilous petioles, entire or somewhat toothed i^not spiny): 

 chiefly southern. 



8, E. Virginianum Lam. Diet. iv. 759. Slender, 1 to 3 

 feet high, branciiing above: radical and lower cauline leaves linear 

 to oblong-lanceolate (petioles sometimes a foot long), entire or 

 with remote small hooked teeth; upper cauline leaves sessile, 

 spiny-toothed or laciniate: heads ovate-oblong (6 lines long), with 

 lanceolate spiny-toothed or entire reflexed bracts mostly as long as 

 the head, and bractlets with 3 spiny cusps, the middle one largest: 

 fruit scaly, with prominent lanceolate acuminate-cuspidate calyx- 

 lobes equally or exceeding the bractlets. 



Wet places, margins of ponds and streams, New Jersey to Florida and 

 Texas. Fl. August and September in the north, June and July in the 

 south. 



Mr. Canby sends specimens from Delaware with bracts longer than the 

 heads, but in every other respect they conform to the species. 



