Between Platycarya and Houttuynia, which has more species within the genus?
Houttuynia
Title: Besla vaga
Passage: Besla vaga is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.  The species is one of twelve known species within the Besla genus of gastropods.  The species is one of three species within the Besla genus to have a binomial name accepted by Laws, C. R. in 1941, with the exception of the other two being Besla rossiana and Besla waitangiensis.
Title: Platycarya
Passage: Platycarya is a genus of flowering plants in the family Juglandaceae, usually treated as comprising a single species Platycarya strobilacea, though one to two additional species are accepted by some authors.  It is native to eastern Asia in China, Korea, and Japan.
Title: Houttuynia
Passage: Houttuynia is a genus of two species in the Saururaceae native to Southeast Asia.  One species, "H. cordata", is widely cultivated as a culinary herb.  The genus was originally described in 1783 by Carl Peter Thunberg when he formally described "H. cordata" as the only species.  It remained a monotypic genus until 2001 when Zheng Yin Zhu and Shi Liang Zhang discovered and described a second species native to China, "H. emeiensis".
Houttuynia Platycarya