Two new hopane-type saponins, succulentosides A and B, were isolated from Polycarpon succulentum (whole plant). Based on spectral analyses (including 2D NMR, and FAB-mass spectroscopy), the structures of succulentosides A and B were characterized as 6.-O-[.-L-arabinopyranosyl-(1-3)-~-L-arabin•pyran•sy•]-fl-•-fl-D-xy••pyran•sy•-•6•-O-•-•-xy••pyran•sy••22-hydr•xyh•pane• and 6.-O-c~-L-arabinopyranosyl-3fl-O-fl-D-xylopyranosyl-16fl-O-fl-o-xylopyranosyl-22-hydroxyhopane, respectively.