DIV, n 



ANGIOSPERMAE 



665 



tetramerous (Fig. 698). Aestivation of sepals and petals valvate. 

 Stamens free, numerous, or equal or double in number to the petals. 



FIG. 700. Acacia catechu. ( uat. size. After MEYER and SCHUMANN.) OFFICIAL. 



The colour of the flower is due to the length and number of the 

 stamens, the corolla being as a rule inconspicuous. The pollen grains 

 are often united in tetrads or in larger numbers. The flowers are 

 grouped in spikes or heads. Embryo straight in the seed. 



