LESSON 13.J 



4.B0BTIVE ORGANS. 



85 



very interesting to the botanist, since it completes the symmetry of 

 the blossom. And to show that this really is the lost stamen, it 

 now and then bears an anther, or the rudiment of one. So the 

 flower of Catalpa should likewise have five stamens ; but we seldom 

 find more than two good ones. Still we 

 may generally discern the three others, i 

 as vestiges or half-obliterated stamens 

 (Fig. 196). In separated flowers the 

 rudiments of pistils are often found in 

 the sterile blossom, and rudimentary sta- 

 mens in the fertile blossom, as in Moon- 

 seed (Fig. 177). 



250. Mulliplicatioa of Parts. Quite in 

 the opposite way, the simple plan of the 

 flower is often more or less obscured by 

 an increase in the number of parts. In 

 the White Water-Lily, and in many 

 Cactus-flowers (Fig. 197), all the parts 

 are very numerous, so that it is hard 

 to say upon what number the blos- 

 som is constructed. But more com- 

 monly some of the sets are few and 

 definite in the number of their pgrts. 

 The Buttercup, for instance, has five ' 

 sepals and five petals, but many sta- [ 

 mens and pistils ; so it is built upon 

 the plan of five. The flowers of Mag- 

 nolia have indefinitely numerous stamens 

 and pistils, and rather numerous floral 

 envelopes ; but these latter are plainly distinguishable into sets of 

 three ; namely, there are three sepals, and six petals in two circles, 

 or nine in three circles, — showing that these blossoms are con- 

 structed on the number three. 



FIG. 194. Corolla of a purple Gerardia laid opeD, showing tlie four etamena ; tlio cross 

 shows where the fifth stamen wpuld be, if present. 



FIG. 195. Corolla, laid open, and stamens of Pentstemon grandiflorus of Iowa, &c., with 

 a sterile filament in the place of the fifth stamen, and representing it. ' 



FIG. 196. Corolla of Catalpa laid open, displaying two good stamens and three abortive 

 vestiges of stamens. 



