220 COMPOSITACEAE (COMPOSITE FAMILY) 



VV. Leaves alternate; involucre scarious. . ANTHEMEAE (p. 230) 



UU. Receptacle not chaffy. 

 W. Leaves opposite. . . . . HELENEAE (p. 228) 



WW. Leaves alternate. 

 X. Involucre gummy, not glandulaf -hairy, glabrous. ASTEREAE (p. 221) 

 XX. Involucre not gummy, or merely with glandular hairs if sticky. 

 y. Herbage resinous, glabrous. ASTEREAE (p. 221) 



YY. Herbage not resinous, mostly not glabrous. EELENEAE (p. 228) 

 TT. Rays not yellow. 

 Z. Involucre bracts scarious or scarious-margined. 



a. Leaves pinnately dissected or compounded. . ANTHEMEAE (p. 230) 

 aa. Leaves entire. . . ASTEREAE (p. 221) 



ZZ. Involucre bracts herbaceous throughout. 



b. Leaves all basal. . . ASTEREAE (p. 221) 

 bb. Leaves not all basal. . HELIANTHEAE (p. 224) 



SS. Heads rayless. 



c. Involucre gummy but not glabrous; flowers yellow. ASTEREAE (p. 221) 

 cc. Involucre not gummy or merely glandular-hairy if sticky. 



d. Corolla deeply lobed; flowers rarely yellow. . CYNAREAE (p. 23s) 



dd. Corolla with 4-5 merely triangular teeth. 



c. Receptacle chaffy or hairy. 



1. Plants pubescent with jointed hairs. . . HELENEAE (p. 228) 



ff. Plants without jointed hairs. . HELIANTHEAE (p. 224) 



ee. Receptacle, neither chaffy nor hairy. 

 g. Heads distinctly white; at least the inflorescence very glandular. 



INULEAE (p. 223) 

 gg. Heads yellowish or brownish or purplish; plant usually not glandular. 

 h. Salt-marsh plants. . . ANTHEMEAE (p. 230) 



hh. Not salt-marsh plants. 

 i. Involucre bracts scarious at least at margin. 

 ]. Leaves entire. IITOLEAE (p. 223) 



jj. Leaves not entire. . ANTHEMEAE (p. 230) 



ii. Involucre bracts not scarious though sometimes burlike. 



HELENEAE (p. 228) 

 BB. Flowers all ligulate; juice milky in most. . CICHOREAE (p. 236) 



AA. Shrubs. 

 k. Leaves glabrous or pubescent but not hoary. 



I. Flowers white or pinkish. . . . EUPATOREAE (p. 220) 



II. Flowers yellow. ASTEREAE (p. 221) 



kk. Leaves hoary with white or woolly hairs. 



m. Pappus of capillary bristles. 



II. Involucre of 4-6 bracts. SENECEAE (p. 232) 



nn. Involucre of more than 6 bracts. . . ASTEREAE (p. 221) 



mm. Pappus none. . . . ANTHEMEAE (p. 230) 



EUPATOREAE (Boneset Tribe). — Perennial. Leaves entire to den- 

 tate. Heads rayless, all alike, lo-is-flowered; receptacle naked, flat. 

 Flowers perfect, fertile; corolla tubular, regular, s-toothed, never yellow. 



