264 



PLANT STRUCTURES 



fruits (drupes)) as apricots, peaches (Fig. 189), plums, 

 cherries. 



141. Legumes. This is far the greatest family (Legumi- 

 HOSCB) of the Archichlamydeae, containing about seven thou- 

 sand species, distributed everywhere and of every habit. It 

 is the great zygomorphic group of the Archichlamydese, 

 being elaborately adapted to insect pollination. The more 



FIG. 250. A legume plant (Lotus), showing flowering branch (1), a single flower (2} 

 showing zygomorphic corolla, the cluster of ten stamens (3) which with the carpel 

 is included in the keel, the solitary carpel () which develops into the pod or le- 

 gume (5), the petals (6) dissected apart and showing standard (a), wings (b), and 

 the two lower petals (<?) which fold together to form the keel, and the floral dia- 

 gram (7). After WOSSIDLO. 



primitive forms of the Leguminosae, the mimosas, acacias 

 (Fig. 251), etc., very much resemble true roses and the but- 

 tercups, with their hypogynous regular flowers and nu- 

 merous stamens, but the vast majority are Papilio forms 

 with very irregular (zygomorphic) flowers and few stamens 



