COMPOSITE FAMILY. 231 



(4'-5' long) ; heads of handsome pure white flowers in compound cor- 

 ymbs. Woods, N. 



E. aromaticum, Linn. Like the preceding, commoner S., and only 

 UL'ar the coast ; more slender, usually less smooth, with thicker leaves 

 more bluntly toothed on short petioles ; the corymbs usually less com- 

 pound. 



§ 2. Beceptade hemispherical or conical ; scales nearly equal, only slightly 

 imbricated. 



E. coelestinum, Liim. l°-2° high ; leaves triangular-ovate or slightly 

 heart-shaped, coarsely toothed ; corymb flat ; heads small, of blue-purple 

 flowers, in autumn. N. J., W. and S. 



7. KUHNIA. (For Dr. Adam Kuhn of Penn.) 



K. eupatorioides, Linn. A rather homely herb, 2°-3° high, with 

 lanceolate leaves, and panicled or corymbed small heads of creamy 

 flowers, N. J. to Minn, and S. 11 



8. LIATRIS, BUTTON SNAKEROOT or BLAZING STAR. (An 



unexplained name.) Chiefly in sandy soil. Flowers late summer and 

 autumn. Root tuberous or corm-like. ^ 



Tri'lisa, differing in fibrous root, not plumose pappus, little imbricated 

 involucre, and more or less panicled heads, has two species from Va., S. 



* Bristles of the pappjis plainly plumose to the naked eye. 



-1- Heads small, only i-5-floicered. 



L. ^legans, Willd. Often hairy or downy, 2° high, with compact 

 spike ; short lanceolate or linear leaves ; scales of involucre with spread- 

 ing, rose-purple tips. Va., S. 



■*- -4- Heads large andfeicer, cylindrical, many-floxcered. 



L. squarr6sa, Willd. Common Blazing Star. 1"-5° high ; leaves 

 linear ; heads few, about 1' long ; scales of involucre with spreading leaf- 

 like tips. Penn., S. and W. 



L. cylindr^cea, Michx. Smaller than the preceding, 6'-18' high, the 

 narrow heads with short and rounded appressed tips. W. N. Y., W. 



* * Bristles of the pappus not plainly phnnose to the naked eye. 



I- Heads ^Q-AQ-flowercd, commonly an inch broad. 



L. scaridsa, Willd. Stem stout, 2°-5'-' high ; leaves lanceolate, or the 

 lower spatulate-oblong; scales of the involucre very numerous, with 

 rounded tips, often scarious or purple on the margins. N. Eng., W. 

 and 8. 



-I- -1- Heads S-lH-floicered, from J'-J' long ; stem 2°-5° high. 



L. pycnost^chya, Michx. Leaves linear or lance-linear ; spike very 

 dense of about 5-flowered heads ; scales of the involucre with recurving 

 purplish tips. Prairies, W. 



L. spicata, Willd. The commonest species, in low gi-ounds ; heads 

 8-12-flowered, crowded in a long spike, the oblong and blunt scales of 

 involucre without any obvious tips. 



L. graminifdlia, Willd. Heads 7-12-flowered in a looser spike or 

 raceme ; the riizid appressed scales blunt or slightly pointed. Wet pine 

 barrens fmrn N. J., S. 



L. gracilis, Pursh. Leaves spreading, the lower lance-oblong and 

 long-petioled, the others linear and short: heads 3-7-flowered, small. 

 Ga., S. 



