>>By chance, in connection with some updating of a garden plant encyclopedia|
I'm currently working on, I have had some recent communications over the
correct name for the heart-leafed philodendron. According to Tom Croat, it's
Philodendron hederaceum. All other names (P. cordatum, P. oxycardium, P.
scandens) are synonyms. The reference for this is:
Croat, T. 1997. A Revision of Philodendron subgenus Philodendron (Araceae)
for Mexico and Central America. Ann. Missouri Bot. Gard. 84: 314-704.
Also, the correct name for common pothos is Epipremnum aureum.
On the subject of juvenile and adult leaf shapes, may I recommend Michael
Madison's Revision of Monstera - interesting explanations and diagrams. I
thought this was once published in Aroideana but maybe I'm wrong.
[mailto:firstname.lastname@example.org]On Behalf Of Plantsman
Sent: 25 November 2002 16:48
Subject: Re: [aroid-l] juvenile vs. adult
Seems like I remember the common heart-leafed philodendron vine
is/was named Philodendron oxycardium.
I've seen older Aloe vera that were almost unrecognizable from the
juvenile form: the color was much deeper and the wide leaf margins
were quite "spikey".
I've seen the common Epipremnum aureus changing from the juvenile
leaf shape and size even in three foot tall specimens found at our
area Home Depot. They were already getting quite rectangular with
some perforations of the leaves and were quite happily covering the
tree fern poles. We've got a E. aureus in my office that's been
here over twelve years and due to the low light and low humidity,
it's never left the juvenile stage. It's over ten feet long, still
with small heart-shaped leaves, mostly green. I suspect heat, light
and humidity would kick it off into mature form.
Kingsport, TN (Zone 6A)
----- Original Message -----
Sent: Monday, November 25, 2002 12:11 AM
Subject: [aroid-l] juvenile vs. adult
: Thanks, everybody, for explaining about Epipremnum aureus (what I
: calling common pothos). Now about this "adult form" versus
: thing... I've also heard about this change in looks for common
: philodendrum (whatever THAT is really called).
: And I think I've actually seen something like this sort of change
in a very
: unrelated houseplant, the thing sold as "aloe vera," so maybe this
is not an
: uncommon process across the vegetative world? Of course "aloe
: climb, but the change in appearance is very striking.
: Let me review the process for aroids as I understand it, what we
: in the florist's little pot is a juvenile form that looks very
: the adult. I sense from cryptic discussions I've read elsewhere
: switch to an adult form requires at least a tall moist standard
for the vine
: to cling to and climb, plus copious amounts of sunlight.
: Please correct me on the above. Then, my questions (sorry they're
: but I would guess there may be someone else on this list who
: this stuff), for anybody to answer:
: 1) Does this happen only to vining aroids?
: 2) Besides lots of light, does this also require lots of heat and
: 3) So can this be done indoors under home conditions without a
: Can this be done in a greenhouse? Is this strictly for outdoors in
: 4) What actually are the basic trigger and mechanism of this
: 5) What is the advantage of this change in evolutionary terms?
: 6) Is there a particular book that everybody else learned all this
: Thanks, and sorry if this seems like I'm quizzing you. I'm just
: stunned at the revelation that feral pothos can grow that big.