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SUBTRIBE i. HOMOCHROMJE. Disk wholly of hermaphrodite 

 flowers, of the same color as the ray when that is present, 

 mostly yellow : 



3. Griudelia. Pappus of few elongated awns or rigid bristles, heads 

 usually radiate, solitary at the ends of the branches: coarse herbs with 

 sessile rigid mostly serrate leaves. 



4. Chrysopsis. Pappus of numerous setose bristles both in disk and 

 ray, manifestly double, the inner capillary, the outer very short and 

 squamellate, low leafy stemmed perennials with sessile entire or nearly 

 entire leaves 



5. Ammodia. Pappus of slender setose bristles obscurely double, the 

 inner capillary, the outer very short and setulose or obsolete: low per- 

 ennial herbs 



6. Eriocarpum Pappus white or nearly so. of exceedingly unequal 

 somewhat flattened barbellate bristles: achenes short, densely silky ; low 

 herbs with narrow sparsely dentate leaves. 



7. Pyrrocpma. Pappus reddish-br wn or fulvous, of numerous uniform 

 slender rigid bristles; achenes linear, elongated, somewhat turbinate, 

 3-angled and striate: glabrous, rigid perennial herbs with mostly radical 

 leaves. 



8. Stenotus. Pappus commonly bright white, of numerous soft unequal 

 densely scabrous capillary bristles: achenes oblong-turbinate densely 

 silky-vi lous: glabrous shrubby plants with narrow entire leaves. 



9. Macronema. Pappus of soft slender bristles : achenes slender, com- 

 pressed, few-nerved: soft pubescent low and many-stemmed suffrutescent 

 plants with thinnish sessile entire leaves. 



10. Chrysothamiius. ^appus of soft subequal bristles : achenes narrow, 

 not compressed: shrubby or half shrubby plants with narrow entire 

 subcoriaceous leaves. 



11. Kill ham hi. Pappus of numerous equal capillary scabrous bristles in 

 one or more series : achenes short and turbinate': villous pubescent ; 

 perennial herbs with linear entire 1-nerved leaves. 



1^2. Solidago. Pappus of numerous capillary scabrous bristles : achenes 

 terete or angulate 5-12-nerved or costate : perennial herbs with entire or 

 serrate leaves. 



SUBTRIBE ir. HETEROCHROME^E. Disk flowers mostly yellow 

 the rays white, red, purple or blue; seldom yellow. 



18. Bellis. Pappus none: achenes obovate and compressed, nerveless 

 except at the margins: low perennial herbs with all radical leaves 



14. Boltoiiia. Pappus of several short-setulose squamellse and 2-4 elon- 

 gated rigid awns: achenes obovate, very flat, with callous or winged mar- 

 gin : leafy-stemmed perennials. 



15. Towiisendia. Pappus a single series of long awns : achenes obovate 

 or oblong, much compressed with thickish or callous margins: depres- 

 sed or low many-stemmed herbs 



16. Sericocarpus. t'appus of numerous unequal scabrous bristles: 

 achenes narrow, little compressed, 2-nerved, silky-pubescent: leafy- 

 stemmed perennials. 



17. Aster. Pappus of numerous dull white scabrous bristles : achenes 

 compressed : leafy-stemmed herbs with panicled or somewhat corym- 

 bose heads of flowers. 



