DE CANDOLLE'S NEW MONOGRAPHS. 251 



many years, has very naturally tried the other tack, and has 

 developed the Linnsean Vitis and Cissus into ten genera. The 

 principles upon which he has proceeded, as explained in the 

 preface, are wholly legitimate ; and one could wish that they 

 have been successfully applied. This, only use can deter- 

 mine. We may be confident, however, that if this monograph 

 had been in the hands of the authors of the latest Genera 

 Plantarum, they would not have bodily adopted its conclu- 

 sions, although they would have been much helped by the 

 elaborate investigations, and might have seen their way to 

 admit three or four genera. They would not have trusted 

 over-much to the difference between polygamo-dioecious, i)oly- 

 gamo-monoecious and partly pseudo-hermaphrodite, herma- 

 phrodite and probably some pseudo-hermapln?odite, and her- 

 maphrodite or rather physiologically polygamo-monoecious and 

 with some blossoms pseudo-hermaphrodite, — differences which 

 must be shadowy, — nor to variations in the mere shape of 

 style and stigma. And as to the disk, which should be more 

 tangible and hopeful, we gather from Planchon's synopsis and 

 from our own observations that there are only three types. 

 In the true Grapevines the disk is represented by nearly dis- 

 tinct and free nectariferous glands, alternate with the stamens. 

 In most other Ampelidece, it is cupular or annular (entire or 

 crenate or lobed), with base or lower half more adnate to the 

 base of the ovary, but at least the margin or lobes free. In 

 the Virginia Creeper there is really no disk at all, as was first 

 noted by Dr. Torrey in his " Flora of the Northern States," 

 in 1824, and insisted on in the " Flora of North America," in 

 1838, and again in the " Genera lUustrata," where there are 

 correct figures. Dr. Planchon expresses the same opinion in 

 essence but in different language, i. 6., "Discus obsoletus 

 ovarii basi plane adnatus et tantum colore proprio subdis- 

 tinctus." We could not make much of the color ; but the 

 tissue does thicken more or less, and possibly may become 

 obscurely nectariferous ; but the flowers are not attractive to 

 bees, as the allied species from Japan is. In the latter, while 

 there is equally no hypogynous disk, there is much thickening 

 of nectariferous tissue over all the lower part of the ovary 



