Assertion: cultivar's leaf | /r/CapableOf | form concave cup
Facets:
value: over the tree trunk
type: LOCATION
Source sentences:
text: Several species exhibit adaptations for mutualism with ants by providing modified leaves for domatia ("homes"), much as in the related genus Dischidia; H. imbricata has leaves that form a concave cup over the tree trunk it climbs up to shelter ants, and H. darwinii has arrangements of bullate leaves on its stems to form shelters.