Based on the photos I've seen of P. spiritus-sancti ('Santa Leopoldina')
and all the other philodendrons erroneously called 'Santa Leopoldina',
there can be no mistaking the real thing based on the strikingly narrow
leaf blade length to width ratio. To my mind the only philodendron that
can legitimately be called 'Santa Leopoldina' is the one the Brazilian
locals have endeared with this name for perhaps centuries. And that plant
is P. spiritus-sancti.
There is no argument whatever to be made regarding 'first publishing rights'
of the name 'Santa Leopoldina' since it is not a scientific name under the
control of botanical nomenclature.
In any case, those who have labeled these various species and hybrids with
the name are in error, including Graf. The name 'Santa Leopoldina' comes
originally from the Brazilian people of the P. spiritus-sancti habitat, they
coined it for this particular plant, so it cannot be placed on any other
philodendron. I do understand there are a couple of forms of
spiritus-sancti with minor physical differences, such as reddish reverse.
But almost without exception, the philodendrons being erroneously called
'Santa Leopoldina' have little physical similarity to the real
spiritus-sancti, and can be dismissed very easily.
Russ
central Florida
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