> Do you have any other information about Roridula? I have never seen the name
> before.
_Roridula_ (Roridulaceae) is a small genus (2 spp.: _R.dentata_ &
_R.gorgonias_) of dicotyledoneous plants from and endemic to the Cape
region (S Af). The leaves have numerous glandular emergences
superficially resembling the tentacles of the cps in the plumbagin
group (incl. Droseraceae). However, the emergences of _Roridula_ lack
endodermis like tissues underlying the secretory cells, and they are
not vascularized. The secreted liquid is resinous (unlike the
mucilaginous secretions of most sticky cps). The flowers are rather
specialized because they depend on the action of certain
invertebrates to bite the "explosive" anthers into operation.
Morphologically, it is rather difficult to place Roridulaceae close
to any other plant family.
A placement in Saxifragales s.l. was tentatively proposed mainly
because some sticky cps of (p.p. formerly) uncertain affinity were
traditionally placed there. By rbcL gene homology comparison,
Roridulaceae group next to Sarraceniaceae. As both families contain
iridoid monoterpenoids, at least a common placement in a clade also
containing Ericaceae and Cornaceae seems justified.
The carnivorous status of _Roridula_ is rather doubtful, as no
compelling evidence for endogeneous secreted proteases was presented
yet (with the possible exception of the mentioned article which I
have not seen yet).
Kind regards
Jan