146 



ROSACEOUS FLOWER 



[CH. 



and spreading open, like a saucer, as in Ruhus (Fig. 43, B), 

 or deeper and more cup-like, as in Prunus (Fig. 43, A), or 

 more prolonged upwards and tending to close in above, 

 somewhat like an urn, as in Rosa (Fig. 43, C), or even 

 narrowed to a small orifice closely investing the style or 

 styles above, as in Pyrus (Fig. 43, D F). 



Fig. 43. Rosaceous flowers. A Blackthorn, B Blackberry, C Rose; 

 all these are perigynous. D and E White Bean, F Pear ; all epigynous. 



At the margins, or throat, of this calyx-tube the sepals 

 come off as five equal and more or less separate and 

 triangular or ovate lobes, spreading or reflexed as the 

 flower opens, but fitting together at the slightly imbricate 

 margins in such a manner that two sepals overlap their 

 neighbours with both margins, two underlap with both 

 margins, and one has its upper margin overlapping and 

 its lower underlapping, a kind of aestivation known as 



