30 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



non-foveolate group is Eobertsonia, which only includes three 

 species, umbrosa, Gemn, and cuneifolia. The third is Bergenia 

 (called Megasaea byHaworth), which is confined to the Western 

 Himalayas and mountains of Siberia, and is very clearly separ- 

 ated from all the other groups by its red unspotted petals, thick 

 rootstocks, and large undivided leaves of firm texture. Of the 

 foveolate groups the best known is Euaizoonia (or crustaceous 

 Saxifrages), in which the densely rosulate leaves are margined 

 with numerous chalk- secreting pores, and the numerous 

 flowers form ample erect panicles. The most widely spread 

 species of this group is S. Aizoon. For purposes of cultivation, 

 Cotyledon, florulenta, longifolia, and lingulata are the finest. 

 Several of the species have a restricted range amongst the 

 mountains of Southern Europe. I should like to know how far 

 these need carbonate of lime for their successful cultivation. In 

 Kabschia, under which eighteen cultivated species fall (of which 

 we may take S. Burseriana as a type), the leaf -glands are much 

 fewer and less conspicuous, the flowers fewer, and the leafy 

 shoots last for many years, and are thickly beset down below 

 the fresh leaves with the relics of the old ones. In Porphyrion, 

 which includes oppositifolia and three other high alpine species, 

 the leaves are opposite and decussate, and the red or purple flowers 

 solitary on short leafy peduncles. In the small Chinese and 

 Japanese group Diptera there are long creeping stolons, and the 

 spotted petals are very unequal in size. The Californian S. pel- 

 tata has large peltate leaves like that of a Bhubarb or Gunnera. 

 I do not think there are many species not yet introduced that 

 are worth much from a garden point of view. Out of the thirty- 

 five Himalayan species, which are mostly endemic, twenty-six 

 have not yet been introduced. 



Structure of the Ovary. — A difference in the structure of the 

 ovary upon which botanists greatly rely for purposes of classifi- 

 cation is overlooked very easily by a casual observer. There are 

 in the genus three distinct types as regards the cohesion of the 

 ovary and calyx-tube. To take our illustrations from the wild 

 British species, in Geum, umbrosa, stellaris, and Hirculus, the 

 carpels are entirely distinct from the calyx-tube. In the species of 

 this group the calyx is sometimes reflexed when the flower is 

 fully expanded. In hypnoides, granulata, aizoides, and oppo- 

 sitifolia, the lower part of the carpels is fused with the calyx- 



