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); ov, 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. 



