125. CoMPOsiTAE 233 



4. Corolla 1.5-2 nun lony,, the tube shorter than the limb; 

 rosette-leaves spatulate; moist ground, chiefly in the 

 southern half of 111. May-June V. radiata (L.) Dufr. 



124. Dipsacaceae Lindl. — Tea.sel Family 



1 . Dipsacus L. — Teasel 

 1. Leaves entire; roadsides, fields, pastures, and waste places; nat. 



from Eur. July-Sept D. sylvcstris Huds. 



1 . Leaves pinnately lobed or dixided ; introd. from Eur. ; used by 



florists in wreaths; reported from Cook and Jackson counties; 



Peoria, I'. H. Chase D. laciniatus L. 



125. Compositae P.F.Gmel. — Composite Family 



(Carduaceae Neck.; Cichoriaceae Reichenb. : Ambrosiaceae Link) 

 1. Heads composed of ray- and disk-flowers, or of disk-flowers only; juice not 



milky Series I. Tubuliflor.'ve. p. 233 



1. Heads composed whoUy of perfect flowers with ligulate coroUas; herbs 



usually with milky juice; leaves alternate or sometimes all basal 



Series II. LigulifloraEj p. 238 



Series I. tubuli florae DC. 



1. Pappus of capillary bristles. 



2. Heads radiate, i.e., the outer flowers of the head with strap-shaped 

 corollas. (Rays ininute in Dyssodia.) 

 3. Rays yellow (whitish in one species of Solidago). 



4. Bracts in one series, about equal in length (a few short basal ones 

 sometimes present) ; pappus single. 

 5. Leaves opposite, dissected into linear lobes; bracts bearing 3-7 

 conspicuous glands; pappus of 8-15 scales, each dissected into 

 5-10 bristles 42. Dyssodia 



5. Leaves alternate and basal; bracts glandless; pappus of numerous 



capillary bristles 51. Senecio 



4. Bracts in several series, unequal, overlapping. 



6. Heads numerous, small; pappus single 16. Solidago 



6. Heads fewer, large, solitary, or corymbose. 



7. Leaves serrate; pappus single. 



8. Leaves white-woolly beneath 24. Inula 



8. Leaves not white-woolly beneath 15. Haplopappus 



7. Leaves entire or nearly so; pappus double. 



9. Achenes of ray-flowers with ca|3illary jsappus ....13. Chrysopsis 

 9.Achenes of ray-flowers without pappus 14. Ileterotheca 



3. Rays not yellow. 



10. Bracts in 3-5 series; rays broad, few 19. Aster 



10. Bracts usually in 1 or 2 series; rays usually narrow and numerous 



20. Erigeron 



2. Heads rayless (or apparently so), the flowers usually all tubular. 

 11. Flowers white or whitish, or cream. 

 12. Leaves prickly. 



13. Heads 1-flowered, in capitate clusters 53. Echinops 



13. Heads many-flowered, distinct 54. Cirsium 



12. Leaves not prickly. 



