Andrcecium 



"3 



those cases where the calyx and corolla resemble one another, 



being both green or both petaloid, especially when it occurs 



among monocotyledonous 



plants. In this case we 



speak of it as being gamo- 



phyllous or polyphyllous. 



(Some botanists use the 



term perianth for describing 



the flowers which possess 



only one floral envelope.) 



Estivation. — Just as 

 the terms vernation a.ndj>rcs- 

 foUation are applied to the arrangement of the foliage leaves in 

 the bud, so the terms aestivation and prsefloration are em- 

 ployed to describe the arrangement of the leaves in the flower- 

 bud. The same terms already employed (see Chapter VII.) 

 can also be used in this case. Besides these, however, we apply 

 the term vexillary to the estivation as seen in a papilionaceous 

 plant (fig. 205), and crumpled when the petals are crumpled 

 up as in the Poppy. 



Fig. 204. — Spurred 

 stamens of Violet. 



Fig. Z05. — Vexillary assti- 

 vation of Papilionaceae. 



Fig. 206. — Mon- 

 adelphous sta- 

 mens olMalva. 



FiG. 207. — Diadelphous stamens of 

 Lathyrus ; nine filaments united 

 into a sheath at the base, one 

 free. 



Fig. 208.— Polyadel- 

 phous stamens of 

 Orange. 



Andrcecium. — We now come to the first whorl of the 

 essential organs of the flower. Each stamen of which the an- 

 drcecium is composed consists, when complete, of three parts, 

 viz., the stalk which attaches it to the rest of the flower, apd 



I 



