188 



COMPOSITE, (composite familt.) 



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

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

 ■^ "^ ■'" ■*- Leaves opposite, the upper alternate, long-petiohd : heads 12 - 15-Jlowered, 

 in compound corymbs. 



14. E. serdtinum, 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-Jlotvered ; the scales of the involucre nearly equal and in one 

 row : leaves opposite, ovate, peiiokd, triple-nerved and veiny, not resinous-dotted : 

 Jlowers white. 



15. E. ageratoides, L. (White Snake-root.) Smooth, branching 

 (3° high) ; leaves broadly ovate, pointed, coarsely and sharply toothed, long-petioled, 

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

 especially northward. 



16. E. aromdticum, L. Smooth or slightly downy; stems nearly 

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

 — 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-weed. 



' 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 petiolcd leaves, and corymbose-panicled flesh-colored 

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



I. M. SCctntlens, L. Nearly smooth, twining; leaves somewhat trlan- 

 gular-heait-shaped or halberd-foim, pointed, toothed at the base. — Copses along 

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



8. CONOCLINIUM, DC. Mist-flowek. 



Heads many-flowered. Involucre bell-shaped, the nearly equal linear-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 K^ros, 

 a cone, and KKlvrj, a bed, from the conical receptacle.) 



1. C. ccelestinum, DC. Somewhat pubescent (l°-2° high); leaves 

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

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



9. NARDOSMIA, 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. 



