ANTHOPHYTA 377 
Family 300. Lactucaceae. Lettuces. Herbs with a 
milky juice; calyx mostly capillary; 
receptacle usually naked; flowers all 
ligulate, so no proper rays; medium 
sized to small plants.—Lactuca, Hier- 
acium, Cichorium, Taraxacum, (Leon- 
todon). 
REFERENCE BOOKS 
A. Engler and K. Prantl, Die Natiirlichen Pflanzenfamilien, 
Leipzig, 1889 to 1909. 
C. E. Bessey, A Synopsis of Plant Phyla, Lincoln, 1907. 
A. Engler and E. Gilg, Syllabus der Pflanzenfamilien, Berlin, 
1912. 
C. E. Bessey, Revisions of Some Plant Phyla, Lincoln, 1914. 
