VENATION OF THE STYLE. 93 
once explains the necessity of the peculiar venation of the 
styles, and the evascularity of the lamina, there being no 
recurrent vein. 
In Gilia tricolor Loudon's Annual, the stigmatic surfaces 
are confined to the inner surfaces of the divisions of the 
styles, or of the styles themselves, the ovarium. has three 
dorsal veins which are continued up the styles, and three 
others which run up the line of union of the carpellary leaves, 
and terminate about the apices of the placenta. 
In Linaria triphylia, Loudon's Annual, there are several 
veins to the carpellary leaves, the dorsal is the largest, 
anastomosing, and continued into the style; the anterior 
vessel of the style the smaller stigma punctiformi-capitatum. 
Placentary vessel ends by anastomosing with the dorsal vessels 
of either carpellary leaf. 
In RAinacanthus, the stigma is simple, the surface occu- 
pying whole of the inner face of the divisions of the style, 
and produced upwards above it; the termination of the style 
is here marked enough. Ovarial vessels about four, of which 
the most lateral ones supply the placentz, only the dorsal 
one alone is prolonged into the style. 
In Acanthacea, alia, the same conformation occurs, but 
the limits of the style are less distinct; the lobes of the 
stigma are equal, the ovarial leaf about three-veined, the two 
lateral ones supplying the placenta. : 
In Alyssum, the disposition of the vessels is curious, the 
2 larger bundles of the 4, are perfect, they are anterior and 
posterior, and to them, the funicles are attached, and from 
them they derive their vessels, the 2 smaller bundles are 
simple, and are continued up the style as far as the larger 
bundles. I find also that the placental vessels are the ear- 
liest developed, and that they may be nearly perfected almost 
before the appearance of the smaller ones. The analogy of 
other venation would lead me to suspect that in this plant 
the ovula really arise from the midribs of the carpellary 
leaves. Other vessels subsequently appear in the lamina ? 
Curious appearance of the septa occur, as if traversed by 
irregular cyclose vessels, the cellular tissue is also curious. 
