20 DK. U. T. MASTERS O^S" THE MOEPHOlOaY OF THE MALVALES. 



the sepals, as they seem to do also in Cheirostemon. In the latter 

 plant the anthers are all turned to one side, in the same way as 

 the petals of a ligulate corolla. Considering, from a recent exa- 

 mination of living specimens, that the androecium of Fremontia 

 and Cheirostemon is really pentandrous, an opinion now enter- 

 tained by Dr. Hooker (see Bot. Mag. 1866, tab. 5591), and not 

 decandrons as formerly supposed^ the arrangement of the sepals 

 and stamens, in the plants just named, may be expressed as 

 follows: 



s s s s s 

 st st st st st 



In JValtheria there are five petals and a column of five united 

 stamens, which latter are clearly antipetalous. 



This arrangement may be symbolized in the following man- 



ner: 



s s s s s 



p p p p p 



st st st st st 



s 8, representing the sepals ; p p, the petals ; st st, the stamens 



placed in front of the petals. 



In BonibaXy Eriodendron^ &c. the stamens, instead of being 

 simple, are compound, the five antipetalous bundles representing, 

 not so many groups of distinct stamens, but five originally simple 

 stamens each split up into many subdivisions. This may be re- 

 presented as follows : — ■ 



s s s s s 



p p p p p 

 sts sts sts sts sts 



In Sidalcea the stamens are in two rows, and show a tendency 

 to become united into phalanges ; or, more properly speaking, there 

 are ten comjJound stamens in two rows, five outer antipetalous 

 groups alternating with five inner sets. The formula for this 



would be 



s s s s s 



p p p p p 



sts sts sts sts sts 

 sts sts sts sts sts 



R 



minated by five teeth or staminodes, which represent probably the 

 inner staminal whorl of Sidalcea. This arrangement is shown by 

 the following symbol, X X denoting the staminodes : — 



