AESTIVATION 215 



This is the case with HIBISCUS, GOSSYPIUM, AL- 

 TH^EA the Hollyhock, and all others of that family, 

 with VINCA, CERBERA, NERIUM, PLUMERIA (fig. 27) 

 and all others of their family, with JASMINUM, and 

 with the Coffee, IXORA (fig. 47) and many other plants. 



In a very large number of plants, the petals (or 

 corolla lobes) overlap each other unequally, one or 

 two being overlapped by two edges, and one or two- 

 overlapping the next ones, by two edges. They are 

 then said to be imbricate. This is the arrangement 

 in CASSIA, CJSSALPINIA, PisuM the Pea, LATHYRUS 

 the Sweet-pea, and the other flowers studied in 

 chapter xvi. 



We have seen too that with this there is the further 

 variation, that in the first two the odd posterior petal 

 is innermost of all in bud, in the other two, it is 

 outermost (fig. 48, p. 202). 



In many cases the corolla is folded inwards along 

 (generally) five lines, which run up the flower from 

 the base. This is well seen in SOLANUM and DATURA 

 when the areas left in bud exposed to the light, are 

 of a slightly lighter shade, and appear in the opened 

 flowers as five lens-shaped areas. This type is known 

 as induplicate. 



In IPOMCEA and CONVOLVULUS and others of that 

 family the corolla is folded in the same way, but 

 also twisted and may be distinguished from the last 

 as induplicate-convolute. The same occurs in GEN- 

 TIANA the Gentian. 



