356 



OBGANOGEAPHY. 



This suppression of parts is most frequent in the gyncecium. 

 Thus in the Cruciferae {fig. 775), we have four sepals, four 

 petals, six stamens, and two carpels ; here two carpels are sup- 

 pressed : in the Heart's-ease {fig. 778), we have a pentamerous 

 flower, so far as the calyx, corolla, and androecium are concerned, 

 but only three carpels, two carpels being here suppressed : in 

 many Leguminous Plants {fig. 779) we have five sepals, five 

 petals, ten stamens, and only one carpel, four of the latter being 

 here aljortive : in plants of the order Compositse the calyx, corolla, 

 and androecium, have each five organs, but only one, or, accord- 

 ing to other botanists, two carpels. 



In some species of Impatiens {fig. 780), we have five carpels, 

 five stamens, and five petals, but only three sepals ; here two 



Fig. 778. 



Fig. 779. 



Fig. 780. 



Fig. 778. Diagram of the flower of the Heart's-ease. Fig. 779. Diagram 



of a Leguminous flower. Fig. 780. Diagram of the flower of Impor 



tiens parvijiora. 



sepals are suppressed : in Tropceolum pentajohyllum {fig. 781), 

 there are five sepals, and but two petals ; three of the latter organs 



Fig. 781. 



Fig. 782. 



Fig. 781. Diagram of the flower of Tropceolum 



pentaphylhim. Fig. 782. Diagram of flowers 



of Euphorbiaceous Plants becoming more and 

 more simple. After Jussieu. 



1. Stamiuate flower of Tragia cannabina. 



2. „ „ Tragia volubilis. 



3. „ „ Anthostema senegalensa. 



4. „ „ A denopeltis coUiguaye. 



5. „ „ Euphorbia. 



being suppressed. In the Labiatse and Scrophulariaceae one of 

 the stamens is commonly suppressed, and sometimes three ; 

 thus in the Lamium we have five parts to the calyx and corolla, 

 but only four stamens ; and in the Salvia we have also five parts 

 to the calyx and corolla, but only two perfect stamens. 



