264 



PLANT STRUCTUKES 



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

 cherries. 



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

 noscB) of the Archichlamydeae, containing about seven thou- 

 sand species, distributed everywhere and of every habit. It 

 is the great zygomorphic group of the Archichlamydeae, 

 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 (A) which develops into the pod or le- 

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

 the two lower petals (c) 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 



