Assertion: primitive angiosperm | /r/HasProperty | without vessel
Facets:
Source sentences:
text: The putatively primitive angiosperms are without vessels and evolved from a condition in which only tracheids were present to one in which a series of long vessel elements had scalariform lateral walls and highly inclined end walls with many scalariform perforations, to short vessel elements with circular bordered pits in lateral walls and simple perforation plates in horizontal end walls.