4 86 
STRUCTURE AND LIFE HISTORIES 
(ligulate) corolla, formed by the fusion of the five petals, 
as indicated by the five notches at the end (Fig. 372). 
The tubuliflorae may have both tubular and ligulate 
flowers, as in boneset (Eupatorium perfoliatum) or in white 
daisy (Chrysanthemum leucanthemum) , or only tubular, as 
in the burdock (Arctium, Fig. 371), or in the Canada thistle 
FIG. 371. Inflorescence and flowers of the burdock (Arctium minus}, 
a, Inflorescences; b, longitudinal section of the same; c, bud of individual 
flower; d, mature flower; sty, stigma; stig, style; a, ring of syngenesius 
anthers; c, corolla; p, pappus (calyx); oil, ovary; e, mature seed. 
(Cirsium arvense). Among the liguliflorae may be men- 
tioned chicory (Cichorium Intybus, Fig. 372), dandelion 
(Taraxacum), garden lettuce (Lactuca saliva), and others, 
all of which possess a milky juice, or latex. The five stamens 
(rarely four) are inserted on the corolla, and have their 
anthers united in a .tube (syngenesious) around the style. 
