CACTE.E 



11 



showing no pulvinus till after the suberect position is changed to a 

 horizontal one, not very persistent. 



One of the two cotyledons is sometimes bifid, and occasionally 

 only one is present. 



FIG. 398. Opuntia basilaris. 

 A and B, stages in germination. C, seedling. All nat. size. 



Stem conical, succulent, about 5 mm. thick at first, green, with 

 acicular spines projecting in a substellate manner from slightly 

 tomentose protuberances arranged spirally around the young 

 stem. 



Opuntia Dillenii, Haw. (fig. 399). 



Fruit baccate, pyriform, tuberculate, one-celled, many-seeded, 

 with the seeds embedded in pulp. 



FIG. 399. Opuntia Dillenii. A, longitudinal section of seed, x 9 : 7?, radicle ; 

 M, micropyle ; P, endosperm ; OC, testa ; 1C, tegmen. B, transverse sec- 

 tion of seed near base, x 9 : B, radicle ; P, endosperm. 



