264 



TLANT STRUCTURES 



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

 cherries. 



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

 noHce) of the Arcliichlamydeae, 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 {Lodn^), showing flowering ))ranch (1), a single flower {S) 

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

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

 gume {[)), the petals {(]) dissected apart and showing standard (a), wings {b), 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 Leguminosse, 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 Pajnlio forms 

 with very irregular (zygomorphic) flowers and few stamens 



