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 summer) =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 (1-3 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) =Wild Lettuce, Lactuca pulchella.= 24b. Upper leaves dentate or lobed; heads about 1 cm. wide (1-3 m. high) =Wild Lettuce, Lactuca floridana.= 25a. Achene tipped with a slender beak, bearing the pappus at its summit (summer) (Wild Lettuce) --26. 25b. Achene without a beak --29. 26a. Leaves hirsute or hispid on the mid-veins beneath --27. 26b. Leaves glabrous --28. 27a. Leaves pubescent on both sides (1-2 m. high) =Wild Lettuce, Lactuca hirsuta.= 27b. Leaves glabrous, except on the mid-vein (5-15 dm. high) =Wild Lettuce, Lactuca scariola var. integrata.= 28a. Leaves entire or sparsely toothed (1-2 m. high) =Wild Lettuce, Lactuca sagittifolia.= 28b. Leaves chiefly sinuate-pinnatifid (1-3 m. high) =Wild Lettuce, Lactuca canadensis.= 29a. Flowers white, cream-color, or purplish (summer and autumn) (Rattlesnake Root) --30. 29b. Flowers bright-yellow or orange --33. 30a. Heads nodding (6-20 dm. high) --31. 30b. Heads pointing in various directions, in spike-like panicles; involucres pubescent (5-15 dm. high) =Rattlesnake Root, Prenanthes racemosus.= 31a. Heads with 5-7 flowers in each =Rattlesnake Root, Prenanthes altissima.= 31b. Heads with 8-12 flowers --32. 31c. Heads with 20 or more flowers =Rattlesnake Root, Prenanthes crepidinea.= 32a. Pappus dark reddish-brown =Rattlesnake Root, Prenanthes alba.= 32b. Pappus pale-brown or nearly white =Rattlesnake Root, Prenanthes trifoliata.= 33a. Pappus tawny or brown in color (summer and autumn) (Hawkweed) --34. 33b. Pappus white --42.