108 



THE OVULES. 



often wide spaces covering large portions of ihe walla of the cell, aa in poppy, 

 water-lily, and in other cases, as Datura^ they become large and fleshy, nearly fill- 

 ing the ceU. 



\ 628. A FREE AxiLE PLACENTA, without dissepiments, occurs in some 

 compound, one-celled ovaries, as in tte pink and primrose orders. This 

 , anomalyis explained in two ways : first, by the obliteration of the early 

 formed dissepiment's, as is actually seen to occur in the pints ; secondly, 

 by supposing the placenta to be, at least in some cases, an axial rather 

 than a marginal growth ; that is, to grow from the point of the axis 

 rather than from the margin of the carpellary leaf, for in primros* no 

 dissepiments ever appear. 



404 89S 405 



89S. Sauiolus Valornndi, section of flower showing tlie free axile placenta. 399, Ovary of 

 Scropliulariaceje. 400, Ovary of Tulip. 401, Cross-section of ovary of Flax, 6-celled, falsely 

 lO-celled. 403, Ovary of Violet, 1-celled. 403, Ovary of ruchsia, 4-celle(l. 404, Ovary of rock- 

 rose, 1-celled, 6-carpelled. 405. Gentianaceas, 2-valved, 1-celled. 



529. A FEW PECULIAR FORMS of the Style and stigma are worthy of note in our 

 narrow limits, as the lateral style of strawberry, the basilar style of the Labiatse 

 and Borrageworts, the branching style of Emblioa, one of the Enphorbiaceae ; also, 



530. The globular stigma of MirabUis; the linear stigma, of G^romia; the 

 feathery stigma of grasses ; the filiform stigma of Indian com ; the lateral stigma 

 of Aster; the petaloid- stigmas of Iris; the hooded stigma of violet'(3'ri — 379). 



531. Stigma wanting. In the pine, cedar, and the Coniferse generally, both the 

 style and stigma are wanting, and the ovary is represented only by a fiat, open, 

 carpellary scale bearing the naked ovules at its base. 



THE OVULES. 



532. Theie nature. Destined to become seeds in the fruit ovules 

 are understood to be altered^ buds. Their development from the mar- 

 gins and inner surface of the carpel favors this view ; for the ordinary 

 leaves of Bryophyllum and some other plants do habitually produce 

 buds at their margin or on their upper surface ; and in the mignonette 

 ovules themselves have been seen transformed into leaves. 



