This is a red wine variety most commonly associated with Austria where it is becoming increasingly popular.
Hahndorf Hill Winery:
The home of Saint Laurent in Australia
Synonyms include Sankt Laurent, Saint-Lorentzen, Laurenzentraube and Lorenzentraube (Austria) Schwarzer (Germany) Svatovavrinecke (Czech Republic and Slovakia),
There is a variety called Pinot Saint-Laurent which is a different variety. It is not related to either Saint lares, or Pinot Noir according to Jancis Robinson's Wine Grapes.
The variety produces wines which are velvety and deeply coloured (hence the German synonym Schwarzer, black). Sour cherries is one descriptor which occurs often in tasting notes.
Oz Clarke claims the variety is more like Gamay than Pinot Noir - high praise indeed.
The variety is suitable for cool areas and I would predict that a few producers in the Adelaide Hills or perhaps Tasmania may have a look at it.