188 COMPOSITE. (COMPOSITE FAMILY.) 



beneath (5' -8' long) ; scales of the involucre linear-lanceolate. Low grounds-, 

 common, and well known. Varies with the heads 30 - 40-flowered. 

 4- - - - Leaves opposite, the upper alternate, loixj-peiiolcd: heads 12- Ib-jloicered, 

 in compound corymbs. 



14. E. ser6tiimm, Michx. Stem pulverulent-pubescent, bushy-branched 

 (3 -6 high); leaves ovate-lanceolate, tapering to a point, triple-nerved and 

 veiny, coarsely serrate (5' -6' long); involucre very pubescent. Alluvial 

 ground, Illinois and southward. 



# # # Heads 8 - 30-flotvered ; the scales of the involucre nearly equal and in one 

 ran- : leaves opposite, ovate, petioled, triple-nerved and veiny, not resinous-dotted : 

 flowers white. 



15. E. ageratoides, L. (WHITE SNAKE-ROOT.) Smooth, branching 

 (3 high) ; leaves broadly ovate, pointed, coarsely and sharply toothed, lon</-)>etioled, 

 thin (4' -5' long); corymbs compound. Kich woods and copses; common, 

 especially northward. 



16. E. ai'OIlllitiClllll, L. Smooth or slightly downy; stems nearly 

 simple ; leaves on short petioles, ovate, rather obtusely toothed, not pointed, thiekish. 

 Copses, Massachusetts to Virginia and southward, near the coast. Lower 

 and more slender than No. 15, with fewer, but usually larger heads. 



7. MIKANIA, Willd. CLIMBING HEMP-WKKI,. 



Heads 4-flowered. Involucre of 4 scales. Receptacle small. Flowers and 

 achenia, &c., as in Eupatorium. Climbing perennials, with opposite com- 

 monly heart-shaped and petioled leaves, and corymbose-panicled flesh-colored 

 flowers. (Named for Prof. Mikan, of Prague.) 



1. HI. SCantlenS, L. Nearly smooth, twining; leaves somewhat trian- 

 gular-heart-shaped or halberd-form, pointed, toothed at the base. Copses along 

 streams, Massachusetts to Kentucky and southward. July - Sept. 



8. CONDOMINIUM, DC. MIST-FLOWER. 



Heads many-flowered. Involucre bell-shaped, the nearly equal lincar-awl- 

 shaped scales somewhat imbricated. Receptacle conical! Otherwise as in 

 Eupatorium. Perennial erect herbs, with opposite petioled leaves, and violet- 

 purple or blue flowers in crowded terminal corymbs. (Name formed of KCOI>OP, 

 a cone, and K\ivrj, a bed, from the conical receptacle.) 



1. C. ctrlcstimini, DC. Somewhat pubescent (l-2 high); lonvrs 

 triangular-ovate and slightly heart-shaped, coarsely and bluntly toothed. Rich 

 soil, Penn. to Michigan, Illinois, and southward. Sept. 



9. NARDOSITIIA, Cass. SWEET COLTSFOOT. 



Heads many-flowered, somewhat dioecious : in the sterile plant with a single 

 row of ligulate pistillate ray-flowers, and many tubular ones in the disk ; in the 

 fertile plant with many rows of minutely ligulate ray-flowers, and a few tubular 

 perfect ones in the centre. Scales of the involucre in one row. Receptacle flat 



