THE WOMAN'S HOUSE. 125 



Perigynous, around the ovary, as in the Buckthorns (Fig. 

 77). 



280. The Ovary. — The pistil is a transformed leaf, its 

 upper face folded inward. Its lower part forms the ovary 

 (Fig. 179, A, B) ; its apex, prolonged, forms the style ; 

 here the inner margins, turned outward and without a 

 skin, form the stigma. The united leaf-margins of the 

 ovary form the Ventral Suture (L. abdominal seam) ; the 

 mid-rib forms the Dorsal (backbone) suture. The ventral 

 suture turns invariably towards the axis (centre) of the 

 flower. The two halves of the ovary are Valves. The 

 ovaries are usually attached to the ventral suture, as in the 

 Pea and Lily (Fig. 5, 4, e), the Cherry and Vochysia (Fig. 

 179, A, E). 



281. A monocarpous (simple) ovary has but one cell and 

 one placenta. The cell may be 1-ovuled, as in the Cherry, 

 or many-ovuled, as in the Pea. The placenta (17) is 

 double when the ovules are on the ventral suture, because 

 there it is formed by the two leaf-margins. 



282. In the synearpous ovary, the united or adjacent 

 walls of the cells are called Dissepiments, or double-par- 

 titions, as in the Lily and Vochysia. 



283. Fake dissepiments are sometimes formed by a pro- 

 jection from the dorsal to the ventral suture, thus making 

 a 5-celled ovary 10-celled, as in the Flax. 



284. Plaeentation (the position of the placentae in the 

 cell) is Axile (ventral), Central, Dissepiniental, Dorsal, and 

 Parietal : 



I. When Axile, the placentse are on the ventral suture; Cherry, 

 Pea, Lily, Vochysia; this is the usual form. 



II. When Central, the dissepiments are obliterated (making the 

 ovary 1-celled), with the placentae forming a thick axis, as in the 

 Primrose (Pig. 5, i) and the Pinks (Pig. 178, F). 



III. When Dissepimental, the placentae are on the dissepiments, as 

 in the Flowering Eush (Fig. 179, C). 



IV. When Dorsal, they are on the dorsal suture; Water-Shield 

 (Fig. 176, A). 



V. When Parietal, the ovaries are not folded (Fig. 179, D). Their 

 open valves cohere by the neighboring edges, thus making one cell, 

 though normally there are as many ovaries as plaoentse. These open 

 ovaries are called Farleies (Xi. paries, parietis, wall). We see them in 

 the Violet and Fly-Trap (Fig. 179, D). 



11* 



