620 



BOTANY 



I'AKT II 



Senegal (Soudan and Senegambia) and of other species, ACACIAE gummi is obtained. 

 This exudes from wounds as a thick fluid and hardens in the air. 



Family 2. Caesalpiniaeeae. — Trees or shrubs with pinnate or 

 bipinnate leaves. Flowers usually somewhat dorsiventral. Corolla 

 with ascending imbricate aestivation (Fig. 635) or wanting. Tyjoical 



Fia. 637. — Tamarindus indica (| nat. size). (After A. Meyer and Schumann.) Official. 



floral formula : K 5, C 5, A 5 + 5, G 1. The number of petals and 

 stamens is often incomplete. Embryo straight. 



Abundantly represented in the tropics and sub-tropics. 



Important Genera. — Characteristic examples of the Caesalpiniaeeae are 

 afforded bj^ tiie flowers of Cassia. In the sub-group Senna, to which C. angusti- 

 folia belongs, the sepals and petals are both five in number and free (Fig. 636). 

 The lower overla2)}(ing petals are somewhat larger than the upper ones. Of the 

 ten stamens the three upper ones are short and sterile, while the other seven, the 



