APPENDIX. No. V. 427 



In Hippocraticese, the insertion of the ovula is either towards the base, or is 

 central ; the direction of the radicle is always inferior. In these points of 

 structure, which are .left undeteiinined by M. de Jussieu, they diiFer from 

 Malpigliiacese, but agree with Celastrinje, to which, notwithstaiidhig the dif- 

 ference in insertion and number of stamina, and in the want of albumen, they 

 appear to me to have a considerable degree of affinity ; especially to Elaeoden- 

 drum, where the albumen is hardly visible, and to Ptelidium, as suggested by 

 M. du Petit Thouars,* in which it is reduced to a thin membrane. 



SAPINDACEjE. Only four plants of this natm-al family, which is 

 almost entirely equinoctial, occur in the herbarium. Two of these are new 

 species of Sapindus. The lliii-d is probably not spccificdly different from Car- 

 diospermum grandlflorum of the West India Islands. And the fourth is 

 so nearly related to Paulllnla pinnata, of the opposite coast of America, 

 as to be with difficulty distinguished from it. M. de Jussieu,-f- who probably 

 intends die same plant, when he states P. pinnata to be a native of equinoctial 

 Africa, has also described a second species from Senegal.^ No other species 

 of tliis genus has hitherto been found, except in equinoctial America ; for 

 PauUinia japonlca of Thunberg, probably belongs even to a different natural 

 order. The species from Congo, however, seems to be a very general plant 

 on this line of coast ; having been found by Brass near Cape Coast, and by 

 Park on the banks of the Gambia. 



In Sapindaceae there is not the same constancy in the insertion of the 

 ovulum and consequent direction of embrj'o, as in the two preceding orders. 

 For although, in the far greater part of this family, the ovulum is erect and 

 the radicle of the embryo inferior, yet it includes more than one genus in which 

 botii the seeds and the embryo are inverted. With this fact it would seem 

 M. de Jussieu is unacquainted; § and he is surelj' not aware that in his late 

 Memoir on Melicocca* he has referred plants to that genus differing from each 

 otlier in this important point of stiiicture. 



TILIACE^E. It is remarkable that of only nine species belonging to this 



* Hist, des I cgtl. des Isles de V Afrique, p. 34. 



t In Annal. du Mas. dllhl .Vat. i,p. 34T. + loc. cit. p. 348. 



^ Annal. du Mus. d'Hist. Sal. 18, p. 476. J Mim. du Mus. d'Hist. Nut. 3, p. 119. 



