134 COMMON CANADIAN WILD PLANTS. 



2. T. glau'eum, Nntt. Scape 1-2 feet high. Leaves 

 varying from entire to dentate or laciniate. Achenes long- 

 beaked. — N.W. prairies. 



55. TAKAX'ACIIM, Haller. Dandelion. 

 T. Ofileina'le, "Weber. {T. dens-leonisy Desf.) (Common 

 Dandelion.) Outer involucre reflexed. Leaves runcinato. 

 — Fields everywhere. 



56. lACTlT'CA, Tourn. Lettuce. 



1. L. Canaden'sis, L. (Wild Lettuce.) Heads numer- 

 ous, in a long and^ narrow naked panicle. Stem stout, 

 smooth, hollow, 4^9 feet high. Leaves mostly runcinate, 

 partly clasping, pale beneath; the upper entire. Achenes 

 longer than their beaks. — Borders of fields and thicketsi 



2. L. scari'ola, L. (Prickly Lettuce.) Stem below 

 sparingly bristly. Leaves vertical, spinnlose-dentictilate, 

 oblong or lanceolate, prickly on the midrib below. Heads 

 small, 6-12 flowered. — Waste places. 



3. Ji. integrifO'lla, L. Stem 3-6 feet high; leaves all 

 undivided, entire or slightly toothed. Flowers pale yellow, 

 cream-colour, or purple. — Dry soil. 



4. L. hirsu'ta, Muhl. Leaves runcinate, the midrib 

 beneath often sparingly bristly-hairy. Flowers yellowish- 

 purple, rarely white. — Dry soil. 



57. MDLGE'DIITSI, Cass. False ok Blue Lettuce. 

 M. leueophse'um, DC. {Lactuca leucophcea. Gray, in 

 Macoun's Catalogue.) Stem tall and very leafy. Heads in 

 a dense compound panicle. — Borders of damp woods, and' 

 along fences. 



58. SON'CIIIIS, L. Sow-TiriSTLE. 



1. S. Olera'eeus, L. (Common Sow-Tiiistlk.) Stem- 

 leaves runcinate, slightly toothed with soft spiny teeth, 

 clasping ; the auricles acute. — Manured soil about dwellings. 



2. S. asper, Vill. (Spiny-leaved S.) Leaves hardly 

 lohed, fringed with soft spines, clasping; the auricles 

 rounded. Achenes margined. — Same localities as No. 1. 



