COMPOSITiB. 133 



51. CKEPIS, L. 



C. runeina'ta, Torr. and Gr. Stem 1-2 feet high, gla- 

 brous. Eadical leaves obovate-oblong to oblong-lanoeolate, 

 with short lobes or teeth. Cauline leaves absent or very 

 small. Involucro pubescent, sometimes it and the upper 

 part of the scape glandular. — N.W. 



52. PRENAN'THES, Vaill. Baitlesnake-root. 



1. P. alba, li. (Nabalus albus,'H.o6k.) (White Lettuce. 

 Heads 8-12-iiowered. Pappus deep cinnamon-coloured. Stem 

 2-4 feet high, smooth and glaucous, corymbose-paniculate. 

 Leaves triangular-halberd-shaped, or 3-5-lobed, the upper- 

 most oblong and undivided.— Eich woods. 



2. P. altiss'ima, L. (Nahalus altissimus.) (T at.t. White 

 Lettuce.) Heads 5-6-flowered. Pappus pale straw-coloured. 

 Stem taller but more slender than in No. 1, with a long, leafy 

 panicle at the swmviit. — !Rich woods. 



3. P. raeemo'sa, Michx. {Nahalus racemosus, Hook.) 

 Heads about 12-flowered. Involucre and peduncles hairy. 

 Stem wand-like, smooth. Leaves oval or oblong-lanceolate, 

 slightly toothed. Heads crowded in a long and narrow 

 interruptedly spiked panicle. Pappus straw-colour ; flowers 

 flesh-colour. — Shore of Lake Huron and south-westward. 



4. P. Mainen'sis, Gray. Leaves as in the last, but the 

 radical ones ovate and more abruptly narrowed to the short 

 petiole. Heads 8-12-flowered, persistently drooping on 

 slender pedicels. — Atl. Prov. 



53. LTCtODES'MU.. Don. 

 L. jun'cea, Don. Much branched from the ba.se, the 

 branches closely erect and rigid, rush-like, terminating in 

 erect heads of pinkish flowers. Leaves small, the lower 

 lance-linear, the upper scale-like. — N. W. plains, 



54. TRO.\:'IMOX, Nntt. 

 1. T. CUSplda'tum, Puxsh. Scape a foot high. Leaves 

 lanceolate, tapering to a sharp point, entire, woolly on th© 

 margins, Achenes beakless —N.W. prairiesi 



