298 A GUIDE TO THE WILD FLOWERS 



916. Blue Lettuce. Lactuca spicata. A smooth stout plant, 

 3-10 ft. high. Leaves deeply lobed, stalkless, or the lower 

 ones with a winged stalk, the segments sharply toothed, the 

 teeth almost prickle-tipped. Flowers bluish-white, the heads 

 small, erect, and in large, branched clusters. In moist places, 

 Newfoundland to No. Carolina, and westward. August. Fig. 

 916. 



917. Wild Lettuce. Lactuca canadensis. Not unlike No. 916, 

 but the leaves n ot diyid^j ^ and st em-c lasping at the J3ase. 

 Flowers yellow, the cluster of heads not so wide as in No. 

 916. In moist open places, Nova Scotia to Georgia, and west- 

 ward. August. 



918. Wood Lettuce. Lactuca hirsuta. Also resembling No. 

 916, but usually not so high. Leaves not divided, hairy on 

 the midrib, the lower ones stalked, the upper stalkless and 

 often stem-clasping. Flowers orange, the small erect heads 

 in much branched clusters. In dry places, Maine and Ontario 

 to Alabama, and westward. August. 



919. White Lettuce. Nabalus altissimus. (Prenanthcs altis- 

 sima.) A slender erect perennial, 3-7 ft. high, the stem some- 

 times purplish. Leaves thin, more or less halberd-shaped in 

 some leaves, in others on the same, plant without lobes, or 

 sometimes deeply divided. Flowers greenish-white, or green- 

 ish-yellow, the heads nodding, numerous, in a branched clus- 

 ter. In woods and thickets, Newfoundland to Georgia and 

 westward. August. There are several closely related species. 



920. Rattlesnake-root. Nabalus trifoliolatus. (Prenanthcs 

 trifoliolata.) Not unlike No. 919, but the leaves usually 3- 

 divided and the segments stalked, or rarely stalkless. Upper 

 leaves smaller and undivided. Flowers cream-white, the heads 

 nodding in small but very profuse clusters. In dry places, 

 Maine to Tenn., and westward. September. Fig. 920. There 

 are several closely related species, and two stunted alpine ones 

 that grow above timber line on the highest mountains. 



921. Fall Dandelion. Apargia autumnalis. (Leontodon 

 autumnalis.) A low smooth perennial not unlike No. 913 in 

 aspect, but with smaller flower heads. Leaves narrow, cut into 

 small lobes, or sometimes merely deeply toothed. Flowers 



