Assertion: catalpa's leaf | /r/HasAspect | a pair of short thorns
Facets:
value: at the base
type: LOCATION
value: usually
type: TEMPORAL
value: on vigorous young plants
type: LOCATION
Source sentences:
text: Each leaf usually has a pair of short thorns at the base, 1 to 2 mm long or absent on adult crown shoots, up to 2 cm long on vigorous young plants.