Table I.

Morphological characteristics of the four Central Amazon floodplain tree species

Species	Leaf-Shedding	Suberization	Adventitious Roots	Aerenchyma	Intercellular Spaces
T. juruana	−	+++	+	−	+
L. corymbulosa	−	++	−	−	−
S. martiana	−	+	++	+	+
C. benthami	+	−	−	−	+

With the exception of adventitious roots, which are formed in response to low oxygen conditions, morphological traits were not affected by the oxygen level in the growth medium. The intensity of suberization and adventitious rooting is indicated by + and − symbols using the following order: − < + < ++ < +++.