rPOMCEA. 



183 



is done, and their succes- 

 sors, already in bud, will 

 renew the gorgeous dis])lay 

 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) 2cith the snn, i.e., 

 from left to right — a kind 

 of aestivation called super- 

 vohde. 



The 5 stamenf. adhere 

 to the lower part of the co- 

 rolla tube, ()])])()sito to its 



Fig. L.— Ipomoea purpilrea . /, a flower ; sta, tlie stainoiis ; sf, the style : s, 

 stigma ; o, ovary ; d, disk ; o, anther and pollen ; />, a pollen jrrain ; fr, capsule ; c, 

 capsule dissected ; o, cajj-^ule opening ; sU, seid ; z, embryo ; tinb, the embryo grow- 

 ing ; /•. radicle ; c, cotyKd hm. 



