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Dear Steve,
I can only guess that they call rhachis the part of
the leaf with leaflets, as they describe that the petiole is 15-35 cm long.
My plant's total leaf length is up to 120 cm. So possibly the petiole is the
thick part without leaflets and the rhachis is the rest of the
leaf.
"Botany the main axis or stem of an inflorescence
or compound leaf"
In your page I would rather change "Philodendron"
to "Amorphophallus" - a majority of the amateur growers of Amorphophallus
call the petiole "stem".
Although growers that are
family with plants such as a Philodendron would likely call the petiole
the "stem", in the case of this species the true stem is an underground
rhizome(...)
Best,
Marek
----- Original Message -----
From:
S*@ExoticRainforest.com
To: aroid-l@gizmoworks.com
Sent: Tuesday, November 23, 2010 8:42
PM
Subject: [Aroid-l] Zamioculcas
zamiifolia
I addressed this to Anna Haigh at the Kew but I welcome input
from anyone familiar with this plant. I continue to receive mail from
folks telling me the page is wrong no matter how I describe the central stalk
that supports the leaflets which are on short petiolules.
Anna, can you
pass this along to someone that can give me an accurate answer?
I have
revised my page on Zamioculcas zamiifolia several times over whether or
not the plant's central stalk is a petiole or a or a rachis and the leaflets
are petiolulate. I found this on cate this morning and it appears it has
both but I can't discern which is which.
http://www.exoticrainforest.com/Zamioculcas%20zamiifolia%20pc.html
Zamioculcas zamiifolia
(Lodd.) Engl. sec CATE Araceae, 2009 Tuber subcylindric, ± 3-4 cm.
in diameter or more, tough, woody. LEAVES: Petiole green with darker
transverse blotches, 15-35 cm. long, 1-2 cm. in diameter near base; blade
20-40 cm. long; leaflets 4-8 per side, subopposite, distant, oblong-ovate to
-elliptic to -obovate, sometimes oblanceolate, fleshy, dark glossy green, 5-15
cm. long, 1.5-5 cm. broad, shortly acuminate, sessile or shortly petiolulate,
articulated to rhachis, cuneate to rounded basally; rhachis terete, marked
like petiole.
Will you take a look at the page or ask
someone that is knowledgeable about the plant to tell me exactly where the
rachis and petiole differ?
All the rest of the material was taken from
Pete, Simon and Josef's text The Genera of Araceaa and despite the fact
growers argue with me all the time I will take their word over that of any
grower that believes this plant should b grown dry. It does grow in dry
conditions part of the year, but it is not a desert species!
Thanks a
bunch!
Steve Lucas
www.ExoticRainforet.com
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