You know a grape is rare when you can’t find any information on it at the usual wine websites. Wikipedia has a brief note basically stating it is from the Canary Islands and genetically distinct from the Italian grape variety of the same name.
The best information I could find was from a university working to categorise local Spanish grape varieties. Unfortunately it’s all in Spanish so you’ll have to google translate.
Click on the image below to open the article.
The Honest Wine Drinker 