LACTUCA IN IOWA 245 



cousin" Herb. Parry; Madison, Allen, 7 sheets; Onalaska, Pammel, 

 1917. Utah — Logan Canon, Pammel, 1908. Colorado — Soldier 

 Canon, elevation 6,500 feet, 1898. 



4. Lactiica sayittifolia Ell. Bot. S. C. & Ga. 2 : 253 (1821-24) Ar- 



row-leaved Lettuce. 



Very leafy up to the branched inflorescence; two to six feet high, 

 glabrous throughout ; leaves entire, thickish, lanceolate to broadly 

 oblong, the broad amplexicaul auricles of the sagittate base slightly 

 toothed, the basal leaves sometimes petioled. Heads five to seven 

 lines high, rays yellow or reddish ; akenes oval, flat, longer than the 

 filiform beak. 



The plant ranges from New Brunswick and Ontario to Georgia, 

 Missouri and Idaho. All Iowa specimens seen are from the southern 

 portion of the state. Frequent locally in rich soil. 



Specimens examined : 



Iowa: Ogden, Pammel, 1898; Decatur County, Anderson, 1904; 

 Des Moines, McKiine, 1916; Mt. Pleasant, Jaques, 1917; Hopkin- 

 ton, Macbride; Appanoose, Fitzpatrick, 1902; Taylor County, Fita- 

 patrick, 1898; Ringgold County, Fitspatrick, 1898; Decatur County, 

 Fitspatrick, 1896. 



North America: Illinois — Morris, Pammel, 1918; Urbana, Tre- 

 lease, 1916. Missouri — St. Louis, Greeneman, 1916, 2 sheets. Wis- 

 consin — Madison, C. A. Davis, 1916. Mijuiesota — Duluth, I'aiitnicl. 



5. Lactuca ludoviciana (Nutt) D. C. Prod. 7 : 141 (1838). Western 



Lettuce. 



Lactuca campestris Greene is probably only a color form of this 

 species. Biennial, glabrous throughout up to the branched, panicu- 

 late inflorescence; two to five feet high, with stem stout, leaves 

 sinuate-pinnatifid, the lobes spinulose toothed. Heads large, eight 

 to ten lines high, the flowers not so numerous as in the two preced- 

 ing species. Bracts glabrous, the lower ones ovate. Akenes oval to 

 obovate, flat, about equaling the beak ; rays pink or light purple so 

 far as observed in Iowa ; the flowers seldom opening except early in 

 the morning or on cloudy days ; a very variable species. This plant 

 is a good example of color variation in the flowers. The color given 

 in the manuals is yellow, but forms with blue flowers occur in Colo- 

 rado according to Dr. N. L. Britton. The range is from Minnesota 

 and Illinois to Montana, Colorado and Texas. 



