P van Rijckevorsel writes
A quick look shows that it does not exist

Occam's typorazor suggests you look at
Cistanthe grandiflora (Portulaceae, with characters as described by you)
PvR

Stewart Robert Hinsley schreef
That looks right. Thanks.
--
Stewart Robert Hinsley

+ + +
You are welcome

This would be a likely typo since Latin "cis-" is so common ("Gallia
cisalpina", also in organic chemistry) while 'cist-' (either from the genus
'Cistus' or from the Greek 'kiste': cf Eng 'cyst') is fairly uncommon
(Cistanthe, Cistanthera).
PvR