Gaultheria macrostigma, or prostrate snowberry, is a species of Gaultheria, endemic to New Zealand. Description. A small shrub that grows either prostrate or "staggling". It has small white flowers, and the stigma (noted in the specificic name "macrostigma") has been described as "large." Range. Across New Zealand. Etymology. "macrostigma" means "large stigma." Taxonomy. "Gaultheria macrostigma" was moved into this genus from "Pernettya" in 1990. It is also known to hybridize with "Gaultheria antipoda."