ASTERACEAE: CICHORIEAE 195 
1. Sonchus asper (L.) All. Sow-thistle. 
A common weed throughout the state. Central City; Hastings; Hat 
Creek Basin; Kearney; Lincoln; Nebraska City. 
7. Lactuca. 897. 
Flowers yellow; beaks of the achenes as long as the body. 
Margins of the leaves, and often also the midribs, spiny. 
Heads 6-12 flowered, involucre 8-12 mm. high. 
Leaves sinuate-pinnatifid. 1. L. scariola. 
Leaves merely irregularly denticulate. 
1a. L. scariola var. integrata. 
Heads 12-20 flowered, involucre 10-20 mm. high. 2. L. ludoviciana. 
Margins of the leaves not spiny. 3. L. canadensis. 
Flowers blue or violet; achenes beakless or beak shorter than the 
body. : 
Achenes flat; involucre 15-20 mm. high. 4. L. pulchella. 
Achenes thicker slightly compressed, involucre 10-12 mm. high. 
Achenes not beaked; leaves not pinnatifid. 5. L. villosa. 
Achenes short beaked; leaves pinnatifid. 6. L. floridana. 
1. Lactuca scariola L. 
Red Cloud. 
1a. Lactuca scariola integrata Gren. & Godr. 
A common weed in the eastern part of the state. Minden; Nebraska 
City; Red Cloud; Republican. 
2. Lactuca fludoviciana (Nutt.) DC. Western Wild Lettuce. 
A common weed all over the state. Banner County; Cherry County; 
Franklin; Grand Island; Mullen; Nebraska City; Minden; Pishelville; 
Plummer Ford. 
3. Lactuca canadensis L. Wild Lettuce. 
A common weed throughout the state. Cherry County; Long Pine;. 
Nebraska City; Pishelville; Plummer Ford; Sioux County; St. Paul. 
4. Lactuca pulchella (Pursh.) DC. Blue Lettuce. 
Throughout the state. Cherry County; Brown County; Lincoln; 
Mullen; Nebraska City; Niobrara; Sioux County. 
5. Lactuca villosa Jacq. 
Crawford; Nebraska City; Saltillo. 
6. Lactuca floridana (L.) Gaertn. 
Reported from Crete. 
8. Lygodesmia. 899. 
Heads solitary at the ends of the branches, leaves short. 1. L. juncea. 
Heads racemose, leaves elongated linear, the lower 7 cm. or more 
long. 2. L. rostrata. 
1. Lygodesmia juncea (Pursh.) D. Don. 
Common in prairies throughout the state. Anselmo; Cherry County; 
Freeport; Grand Island; Kearney; Lincoln; Mullen; Minden; Nattick; 
Sioux County; Valentine. 
2. Lygodesmia rostrata A. Gray. 
Less common than the last. Kennedy; Long Pine; Minden; Valentine. 
