IPOMCEA. 



183 



is done, and their succes- 

 sors, already in bud, will 

 renew the gorgeous display 

 the following morning. 



Analysis. Observa- 

 tion and study are wont 

 to begin with the I* lower, 

 and for once we will re- 

 verse our usual order. The 

 calyx, the outer envelope, 

 green, persistent, is com- 

 posed of 5 long-pointed 

 sepals combined at the 

 base into a cup. The in- 

 ner envelope, the fugaci- 

 ous corolla, between trum- 

 pet and bell-form, of deli- 

 cate texture and intense 

 colors, is composed of 5 

 broad petals united along 

 the plicate (folded) edges, 

 quite to the expanding en- 

 tire border. In the bud, 

 the folds are contorted 

 (twisted) with the sun, i.e., 

 from left to right a kind 

 of aestivation called super- 

 volute. 



The 5 stamens adhere 

 to the lower part of the co- 

 rolla tube, opposite to its 



FIG. L. Ipomcea purpilrea s /, a flower ; sta, the stamens ; st, the style ; *, 

 stigma ; o, ovary ; d, disk ; a, anther and pollen ; p, a pollen grain ; fr, capsule ; c, 

 capsule dissected ; o, capsule opening ; sd, seed ; z, embryo ; emb, the embryo grow- 

 ing ; r, radicle ; c, cotyledons. 



