1390 



A TEXTBOOK OF THEORETICAL BOTANY 



Fig. 1290. — Types of ovules. A, Orthotropous. B, Anatropous. 

 C, Amphitropous. D, Campylotropous. E, Hemitropous. (After 

 Prantl.) 



sometimes persists into the ripe seed and stores food materials, constituting a 

 perisperm, or which may later be compressed or destroyed. The amphi- 

 tropous condition may, alternatively, arise from the hemitropous, both the 

 micropylar and the chalazal ends of the ovule being bent downwards {e.g., 

 in Atriplex), like a saddle over the top of the funicle, which is then attached 

 medianly between the arms of the semi-circular ovule. 



One other curious ovular form deserves to be named. It occurs in some 

 of the Plumbaginaceae and also in Opiintia, Phyllocactiis and other Cacta- 

 ceae. The funicle is exceptionally long and forms a complete circle around 

 the ovule, which is free from it except for a small area of attachment at the 

 end of the funicle. This has been called circinotropous (Fig. 1291). 



ABC 



Fig. I2QI. — Phimhago capemis. Three stages in the development of the circinotropous ovule. 



{After Haiipt.) 



