2l8 COMPOSITACEAE (COMPOSITE FAMILY) 



3-lobed; small lip 2-lobed. Filaments and anthers united into a tube; 

 2 anthers with a tuft of hair at tip. Seeds many. (Honor of A. J. Down- 

 ing, an American horticulturist.) 



A. Leaves acute, lanceolate to ovate; 2 lobes of the smaller lip of the corolla lanceo- 

 late. E. D. elegans 



AA. Leaves mostly obtuse, lanceolate to linear; 2 lobes of the smaller lip of the corolla 

 ovate-oblong. U. E. D. pulchella 



COMPOSITACEAE (COMPOSITE FAMILY) 



Herbs or shrubs. Leaves various in form and arrangement. 

 Flowers in heads, often of 2 kinds, their parts in 4's or 5*5; heads 

 involucrale. Calyx limb none or cuplike, or of teeth or scales or 

 awns or capillary bristles, often serving as a means of seed dispersal. 

 Corolla on the calyx, tubular or strap-shaped, or else the inner 

 tubular (disk flowers) and the outer strap-shaped (ray flowers). 

 Stamens as many as corolla lobes, alternate with them, on the 

 corolla tube; anthers syngenesious . Ovary i -celled, ovule i; 

 style i ; stigmas 2 in fertile flowers. Fruit an akene. A difficult 

 family. Keys mostly to genera only. (F. & R. pp. 372-430.) 



SCIENTIFIC KEY TO THE TRIBES. (See also p. 219.) 



A. Corollas all tubular and regular, or only the marginal ones ligulate. 

 B. Heads rayless or radiate ; anther not tailed at base; style branches either trun- 

 cate or tipped with an appendage. 

 C. Heads rayless; flowers never yellow, all perfect; style branches clavate. 



EUPATOREAE (p. 220) 



CC. Heads usually radiate, very rarely both rayless and yellow; style branches 

 rarely clavate. 



D. Style branches of the perfect flowers either flat or tipped with a distinct 

 appendage; leaves mostly alternate. . . . . ASTEREAE (p. 221) 

 DD. Style branches of the perfect flowers truncate or appendaged, but not 

 flattened; leaves often opposite. 

 E. Involucre not scarious. 

 F. Pappus none or not capillary. 



G. Receptacle chaffy HELIANTHEAE (p. 224) 



GG. Receptacle not chaffy except in Gaillardia. . HELENEAE (p. 228) 

 FF. Pappus capillary; receptacle not chaffy. . . SENECEAE (p. 232) 

 EE. Involucre scarious; pappus none or not capillary; receptacle not chaffy 

 except in Anthemis and Achillea. . . . ANTHEMEAE (p. 230) 



BB. Heads rayless (except Inula); anthers tailed at base; style branches neither 

 truncate nor tipped with an appendage. 

 H. Corollas not deeply cleft; receptacle not bristly (except Evax). 



INULEAE (p. 223) 



HH. Corollas deeply cleft; receptacle bristly. . CYNAREAE (p. 235) 



AA. Corollas all ligulate, all perfect CICHOREAE (p. 236) 



