lla. Flowers blue (summer and autumn) 12. 



lib. Flowers orange, yellow, white, or purplish 15. 



12a. Heads 2.5 cm. wide, or larger 13. 

 12b. Heads 1.5 cm. wide, or 'smaller 14. 



13a. Leaves linear; bracts longer than the flowers, heads 5 10 cm. 



wide (615 dm. high) Salsify, Tragopogon porrifolius. 



13b. Leaves broader, mostly serrate; bracts shorter than the flowers; 



heads 2.5 4 cm. wide Chicory, Cichorium intybusr 



14a. Heads in a narrow crowded cluster (5 15 dm. high) 30b. 

 14b. Heads in a spreading open panicle (Wild Lettuce) 22. 



15a. Heads solitary at the summit of leafless stalks 16. 

 15b. Heads several, on leafy, naked, or scaly stalks 19. 



16a. Basal leaves strictly entire; heads about 2.5 cm. wide 

 (summer and autumn) 35a. 



16b. Basal leaves toothed, lobed, or pinnatifid (spring and sum- 

 mer) 17. 



17a. Heads 8 14 mm. wide (1 4 dm. high) 



Dwarf Dandelion, Krigia virginica. 



17b. Heads 2550 mm. wide (16 dm. high) (Dandelion) 18. 



18a. Outer involucral bracts reflexed 



Dandelion, Taraxacum officinale. 

 18b. Outer involucral bracts erect or spreading 



Dandelion, Taraxacum erythrospermum. 



19a. Pappus none; heads about 1 cm. wide (4 10 dm. high; sum- 

 mer) Nipplewort, Lapsana communis. 



19b. Pappus of an inner row of bristles and an outer row of short 

 scales; heads about 3 cm. wide (3 8 dm. high; early sum- 

 mer) Cynthia, Krigia amplexicaulis. 



19c. Pappus of feathery bristles (summer) 20. 



19d. Pappus of simple bristles 25. 



20a. Flower-stalk scaly, without foliage leaves (2 6 dm. high) 



Fall Dandelion^ Leontodon autumnalis. 



20b. Stem leafy (3 10 dm. high) 21. 



21a. Leaves entire, linear-lanceolate . 



Meadow Salsify, Tragopogon pratensis. 

 21b. Leaves serrate, oblong-lanceolate Picris, Picris hieracioides. 



22a. Pappus tawny in color (13 m. high) 23. 

 22b. Pappus white 24. 



23a. Leaves pinnatifid Wild Lettuce, Lactuca spicata, 



23b. Leaves undivided, dentate 



Wild Lettuce, Lactuca spicata var. integrifolia. 



24a. Upper leaves entire; heads about 1.5 cm. wide (5 10 dm. 



high) W T ild Lettuce, Lactuca pulchella. 



24b. Upper leaves dentate or lobed; heads about 1 cm. wide (1 3 



m. high) Wild Lettuce, Lactuca floridana. 



