The cross of C. radicans and
C. grandiflora produces Campsis X
tagliabuana, most often represented in
the nursery industry by the variety
‘Mme Galen’. The cross is an evident
mix of the two: a larger showier bloom
than the American species, but not
quite as large as C. grandiflora.
The simplest way to separate the
two species and the cross is a careful look at the calyx. The Chinese trumpet
creeper features a greenish calyx with long pointed lobes. The American trumpet
creeper enjoys a darker calyx with shorter lobes that are not pointed. The cross
lies in between.
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