SUNFLOWER FAMILY 
A genus of about 50 or more species, natives of the northern hemisphere. Type species, — sativa L. 
baat common garden lettuce is Seeulonkity’ collected in waste places but apparently does not become estab- 
lished 
591 
Aemeal: or biennial; ligttles not long-exserted, shades of yellow (bluish in L. biennis and forms of L. /udoviciana). 
1-nerved on each side. 
Frviting involucres nS as m. high; pappus 5—7 mm. long. 1. L. canadensis. 
Rubehnetaat Subtaapeats3 re 22 arp aigre baie 7-12 mm. long. 2. ha pareminted 
Achenes with a long filiform beak as long as or longer than the achene. 
es black, conspicuously eae ne 3. L. virosa. 
chenes gray or brownish, no 
Inflorescence broadly paniculate rig peste ap branches; stem-leaves bine to elliptic in outline 
Infl picif P lat 1 tly linear- EN Rg — 
5. L. saligna. 
Achenes with a short —- sates ageen than the achene or beakless 
Pappus tawny; ligules 15-35, white or bluish (in ours) 6. L. biennis. 
Repose demic gules -e yellow. 
7. L. muralis. 
Perennial wit ; ligules long-exserted and showy, blue or bluish purple. 
8. L. tartarica pulchella. 
6023. Sonchus oleraceus 6025. us asper 
6024. Sonchus tenerrimus 6026. Lactuca canadensis 
