Assertion: chokecherry's fruit | /r/HasProperty | sour
Facets:
value: very
type: DEGREE
Source sentences:
text: The fruits are about 6–14 mm in diameter, range in color from bright red to black, and possess a very astringent taste, being both somewhat sour and somewhat bitter.
text: These fruits are very sour but are edible, and contain a single seed.
text: I assume the name comes from the fact that the fruit is astringent, bitter and/or sour and thus difficult to swallow, but I don't actually know, and reading the relevant section was unenlightening.