Assertion: thornless boysenberry | /r/HasProperty | vigorous variety
Facets:
Source sentences:
text: These include the Youngberry (a Louisiana berry which is sweeter but not as productive as other varieties), the Loganberry (the oldest of the trailing blackberry varieties for the Pacific Coast) and the thornless Boysenberry (a vigorous variety which produces a large, long, dark reddish black berry and has been shown to be productive in this area.