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  Re: [Aroid-l] Zamioculcas zamiifolia
From: Hannon <othonna at gmail.com> on 2010.12.03 at 07:27:45


I will go over the longer text you sent shortly. In the meantime, it may help to conceive of the petiole as originating from the stem. The stem can be a twig on an oak tree or it can be a rhizome, etc. In Zamioculcas, as far as I can tell, the rhizome is tuberous (or tuberously thickened) and is similar to the rootstock of Gonatopus.. In both cases the rhizome is irregularly tuberous or swollen and ultimately the plant forms a compact clump with multiple growing points. However, the roots are not tuberous-- the "tuberousness" is in the rhizome. Plants with more orthodox tuberous roots include Dahlia, Chlorophytum and others.=C2=A0

Applying these concepts and terms is relatively straightforward in some cases but every form "in between" also occurs and it becomes very problematic to employ a precise terminology for rootstocks. I read a paper years ago describing the "tuber" of a Dioscorea and they described it as having features of both root and stem at the anatomical level!


On 29 November 2010 18:45, Steve Lucas/Exotic Rainforest.com <Steve@exoticrainforest.com> wrote:
Thanks Susan, that and quite a few other changes have now been made to the page as a result of information that was kindly provided by Dylan Hannon at the Huntington.=C2=A0

The petiole grows from a unique structure beneath the soil known as tuberous rhizome roots.=C2=A0 Tuberous roots are true root tissue that is swollen possessing tuberous portions that radiate from a central point known as a crown.=C2=A0 The crown serves as the growth point for the petiole and is effectively the stem.=C2=A0 The petiole changes to become the rachis (RAY-kis) at the point where the leaflets begin to grow creating a single compound leaf so Marek, you had it correct.

Thanks to all that offered help but a special thanks to Dylan for his time today!=C2=A0 If anyone spots an editing error anywhere on the site feel free to point it out. I have a kind lady that tries to find all my errors and we are having the entire page checked now for typos now but we can always use the help from growers on this forum!=C2=A0 I can tell you for certain, there is a ton of bad information on the internet about this plant species!



On 11/26/2010 6:41 PM, Susan B wrote:
Also change family, I believe you meant familiar??

Susan B

From: Marek Argent <abri1973@wp.pl>
To: Discussion of aroids www.gizmoworks.com>
Sent: Fri, November 26, 2010 5:19:44 PM
Subject: Re: [Aroid-l] Zamioculcas zamiifolia

Dear Steve,
I can only guess that they call rhachis the part of the=C2=A0leaf 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=C2=A0growers of Amorphophallus call the petiole "stem".
=C2=A0Although 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(...)
----- Original Message -----
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.=C2=A0 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.=C2=A0 I found this on cate this morning and it appears it has both but I can't discern which is which.=C2=A0


Zamioculcas zamiifolia (Lodd.) Engl. sec CATE Araceae, 2009

Tuber subcylindric, =C2=B1 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.=C2=A0 It does grow in dry conditions part of the year, but it is not a desert species!

Thanks a bunch!

Steve Lucas

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