no TA NIC A L TERMS. 



Note tliat tlie esseutiiil iiarls of tlie pistil are the ovary 

 or seed-bearing part, and tlie stigma wliich receives the 

 jiolleii. 



The style is often wanting, antl then tlio stigma is 

 ncHsile. 



An exceiJtional pistil is found in ;/!/mtios])frmcus plants 

 like tlie Pine. Hero the ovules are not enclosed, Imt are 

 attached to the inner face of an open leaf or scale, the 

 scales forming a cone (Figs. 167, 1G8, 169). 



Cohesion. 



Apocarpous : when the carpels are not united together in any 

 way (Fig. 159). 



Syncaupous : when the carpels are grown together in any 

 degree (Fig. IGO). They may be united merely at the 

 base of the ovary, or to the top of the style. 



Adhesion. 



SuPEKiou: when entirely free from the calyx (Fig. 1.'52, /), 



as in Buttercup, Shepherd's Purse, etc. 

 Inferior : when surrounded by the calyx-tube which grows 



fast to it (Fig. 134,/), as in Apple and Fuchsia. 



THE OVULE. 

 Definition. 



Ovules are the bodies which, after fertilization by the pollen, 

 develope into seeds. 



Placentation. 



By this term is meant the arrangement of the placentas, or 

 projections in the interior of the ovary upon which the 

 ovules grow. Placentation is 



(a) Mariiinal, in a simple pistil like that of Pea, the 

 placenta being on one seam or suture (Fig. 158). 



(b) AxUe or Central, when the pistil is compound, and 

 the dissepiments meet in the centre of the ovary (Fig. 160.) 



(c) Parietal, when the compound ovary is onC-celled 

 and the ovules are borne on the walls (Fig. 161). 



(d) F)'ee Central, when the ovary is one-celled, and 

 the ovules are borne on a column which rises from the 

 bottom of the cell (Figs. 170, 171). 



Parts of the Ovule. 



Funiculus : the stalk by which the ovule is attached to the 



placenta (Fig. 173,/). If this stalk is absent the ovule 



is sessile. 

 Primine : the outer coat of the ovule i^Fig. 17-2. ai). 

 Secundine: the inner coat (Fig. 172, /7). 

 MiCROPVLE : the minute opening through the two coats (Fig. 



172, m). 



'^ 



F\k. lOT. 



# 



Figs. 1C8, 1S8L 



Fig9. 170, 171. 



Ffg. 172. 



