You selected Hoya verticillata var. citrina (Ridl.) D. Kloppenburg. This is a synonym for:

Accepted scientific name:
Hoya verticillata var. citrina (Ridl.) J.F. Veldkamp (accepted name) 1 literature reference for Hoya verticillata var. citrina (Ridl.) J.F. Veldkamp
Synonyms:
Hoya acuta var. citrina (Ridl.) D.H. Kent (synonym) 1 literature reference for Hoya acuta var. citrina (Ridl.) D.H. Kent
Hoya citrina Ridl. (synonym) 1 literature reference for Hoya citrina Ridl.
Hoya parasitica var. citrina (Ridl.) R.E. Rintz (synonym) 1 literature reference for Hoya parasitica var. citrina (Ridl.) R.E. Rintz
Hoya verticillata var. citrina (Ridl.) D. Kloppenburg (synonym) 1 literature reference for Hoya verticillata var. citrina (Ridl.) D. Kloppenburg
Common names: -
Classification:
Plantae CoL
Phylum Tracheophyta CoL
Class Magnoliopsida CoL
Order Gentianales CoL
Family Apocynaceae World Plants
Genus Hoya World Plants
Species Hoya verticillata World Plants
Distribution: peninsular Malaysia (Perak, Pahan, Selangor), Laos
Lifezones: -
Additional data: -
Source database: World Plants, Mar 2014   100%
Latest taxonomic scrutiny: -
Online resource: http://worldplants.webarchiv.kit.edu//
CoL taxon LSID: urn:lsid:catalogueoflife.org:taxon:3226425d-ac8f-11e3-805d-020044200006:col20140401