SUNFLOWER FAMILY 593 
Sonchus leucophaeus Willd. Sp. ™ 3:3:1520. 
Lactuca — a Hit yet in Britt. & ile 7; Fl. 3: 276. 1898, as to plant described; not as to basic type 
Sonch Peeteanes 
Lactuca biennis “iakrg ‘Bocioce 42: 300. 1940. 
Biennial, glabrous throughout, the stems simple, stout, erect, 1 -3.5 m. high, leafy. Leaves pin- 
nati id o or ru poor irregularly i sharply dentate, the upper auric culate-clasp ping at base, 15-30 
hea d 1 d 
cm. long; heads in an elongated, many-flowered panicle, ligules little-exserted, cream- colored to 
bhaish Eblgercs 9-14 mm. high, siege constricted above, the phyllaries pe pena at tip; 
achenes 4 mm. long, mm. broad, narrowly winged on the margins, 3-ribbed on each side, gpa 
ome 
with different ah of brown, narrowed at apex to a very short beak; pappus tawny, o 
times tinged with purple. 
Wet grassy aa in rich soils, Transition and Canadian Zones; nee British tapers and Olympic Mou 
tains, Wace a, to Humboldt Ff eatpeget California, and east a s Washing and Orego: on to the caiters 
United States and Can da. Type locality: not indicated. Fude-Ades 
6027. Lactuca ludoviciana 6029. Lactuca serriola 
6028. Lactuca virosa 6030. Lactuca saligna 
