COMPOSITACEAE (COMPOSITE FAMILY) 219 



ARTIFICIAL KEY TO THE TRIBES. (See also p. 218.) 



A. Herbs. 



B. Flowers either all tubular or the outer ligulate and the inner tubular; juice 

 rarely milky. 



C. Pappus of capillary or plumose bristles. 

 D. Heads radiate. 

 E. Rays yellow. 

 F. Heads 3-10 cm. wide; basal leaves 2-5 dm. long, 1-2 dm. wide, oblong, 



denticulate. INULEAE (p. 223) 



FF. Heads less than 2 cm. wide; leaves smaller. 



G. Involucre bracts in more than 2 series. . . ASTEREAE (p. 221) 



GG. Involucre bracts in 1-2 series. 



H. Rays 20-30 or more ASTEREAE (p. 221) 



HH. Rays fewer. . . . . . . SENECEAE ( p. 232) 



EE. Rays not yellow. 



I. Flowers appearing before the foliage leaves; staminate and pistillate 

 flowers on separate plants; foliage leaves large, palmately lobed, all basal. 



SENECEAE (p. 232) 



II. Flowers on foliage-bearing stems, or appearing after the leaves when they 

 are all basal; leaves not as above ASTEREAE (p. 221) 



DD. Heads rayless. 

 J. Heads distinctly yellow. 



K. Involucre bracts white, many, almost hiding the few small yellow flowers, 



the most prominent feature of the head. . . INULEAE (p. 223) 



KK. Involucre bracts either not white, or not the most prominent feature 



of the head. 



L. Corolla deeply s-lobed. .- . ... . . . CYNAREAE (p. 235) 



LL. Corolla with 4-5 merely triangular teeth. 



M. Involucre bracts in more than 2 series. . . ASTEREAE (p. 221) 

 MM. Involucre bracts in 1-2 series. 

 N. Akenes not ribbed, flattish, 0-4 lateral veins. ASTEREAE (p. 221) 



NN. Akenes s-is-ribbed SENECEAE (p. 232) 



JJ. Heads not yellow; corolla often hidden in white wool or so inconspicuous 



that it shows little if any color. 



O. Leaves large, palmately lobed, squash-leaf-like. . SENECEAE (p. 232) 

 OO. Leaves pinnately veined. 



P. Corolla deeply lobed CYNAREAE (p. 235) 



PP. Corolla with 4-5 merely triangular teeth. 



Q. Leaves white- woolly at least beneath. . . INULEAE (p. 223) 

 QQ. Leaves not white- woolly. 

 R. Akenes 5-is-ribbed or striate. . . . EUPATOREAE (p. 220) 



RR. Akenes flattish, 0-4- veined ASTEREAE (p. 221) 



CC. Pappus none, or of scales, or of rigid bristles. 

 S. Heads radiate. 

 T. Rays yellow. 

 U. Receptacle chaffy. 



V. Leaves in most species opposite at least below; involucre not scarious 



HELIANTHEAE (p. 224 



