254 



PLANT LIFE. 



may be lifted on a common tube with tlie calyx from which 



»^ .^^^ it then seems to arise ; or it may be raised 



\rf \ "'''"' "^^^^ stamens, which then seem to be 



A— v^^ ^'^X'^ attached to it, as in figure 267 ; or stamens, 

 \^^_^ corolla, and calyx may be lifted together 

 (figs. 28S, 355). The corolla is ordinarily 

 not persistent, usually falling or withering 

 shortly after the microspores have been 

 lodged upon the stigma. 

 ^ 357. Irregularity. — Both corolla and 



Fig, 274— Outline of a calyx are often radialh' symmetrical — i. e., 



petal of Lyclinis, 



showing long stalk the parts surrouiiding the center of the 



and an outgrowth, u, ... 



the liguie. Compare stem are of equal size and li]<e sliape, 



fi.?- '37- — After Luers- 



sen. and may be divided into several like halves 



by radial planes (figs. 275, 276). But often the symmetry 

 of the calyx, and still more fretjuently that of the corolla, 



Fig. 275. 



Fig 276. 



Fig 275. — A flower of the flax, hah'ed ; showing radial syiumetry. .See fig 276, Magni- 

 fied 2 diam. — After Bessey. 



Fig. 276. — Diagram showing tile arrangement of the parts of a flower of flax. Outer 

 circle, 5 sepals ; second, 5 petals ; third, 5 stamens ; fourth, 5 carpels, each di\-ided by a 

 false partition into 2 chambers. Five different radial planes will, therefore, divide this 

 flower into hah'es, — After Hessey. 



is SO altered bv uneipial growth of the parts that the flower 

 can be divided into hl<e hahes by only one, or at most two, 



