THE FLOWER 



19 



appear. "\Vebb * has recently observed in Astilbe that the 

 order of succession of floral cycles is sepals, inner stamens, car- 

 pels, outer stamens, and petals. In this case there is an acro- 



Fig. 4. — Capsella Bursa-pastoris. Floral development: A, floral axis before appearance 

 of floral organs ; B, appearance of sepals ; 0, appearance of stamens ; carpels barely 

 distinguishable ; Z>, appearance of petals : «, sepals ; m, stamens ; c, carpels ; p, petals 

 x 130. 



petal succession of certain cycles, followed by a basipetal succes- 

 sion of the remaining ones. The remarkable case of the flower 

 of the Primnlaeeae, noted by Pfeffer,+ is also familiar, in 



* Webb, J. E. A Morphological Study of the Flower and Embryo of Spi- 

 raea. Bot. Gazette 3&: 451-4S0. figs. 87. 1902. For correction of names, see 

 Kkiider in Bot. Gazette 34: 246. 1902. 



\ Pfeffer, W. Zur Bliit henentwicklung der Primulaceen und Ampelideen. 

 Jahrb. Wiss. Bot. 8: 194-215. 1872. 



