xii.] BOTANY. 55 



Primrose (Fig. 28, 29). Flower regular. Calyx 

 of 5 combined sepals. Corolla of 5 petals combined 

 into a tube below. Stamens 5, opposite the petals, 

 their filaments combined with these. Pistil with a 

 i -celled ovary having i style and stigma. 



Deadnettle (Fig. 30). Flower irregular. Sepals 

 5, combined into a cup. Corolla of 5 petals com- 



FIG. 30. Vertical section of Dead-nettle flower, enlarged. 



bined into a tube with two lips ; lobes alternate with 

 the sepals. Stamens 4, 2 longer than the others. 

 Pistil of 2 carpels forming a 4-celled ovary with i 

 style and cleft stigma. 



B. Complete flowers with superior perianth. 



Rose (Fig. 31). Flower regular. Calyx of 5 

 sepals. Corolla of 5 free petals, alternate with the 

 sepals. Stamens many, seated on the calyx. Pistil 



