brcacti:
Subpilocereus margaritensis may = S. russelianus ssp./var. or form margaritensis according to Johns & Backbg. Plant/picture at BBG Notes Below
brcacti:
Subpilocereus margaritensis, some are including all the species/forms into one name repandus.
brcacti:
red dotted island is Island Margarita, left is Aruba, right is Grenada. Next photos are descriptions of Subpilocereus some will be seperate species and some will end up being ssp of repandus.