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  arums + arisaema triphyllum
From: "Agoston Janos" <agoston.janos at citromail.hu> on 2007.04.30 at 07:54:12(15612)
Dear All,

I need a bit help. In the attachment you will find some
unnamed Arum. I have no idear what it can be...

The other 2 are Arum orientale. Is it common that spathe have
different markings at this species?

My Arisaema triphyllum had brown-white spathe, but it has got
green-white spathe this year. Is this chanage he spathe color also or it depends
on the sexuality of the inflorescence?

Thany in advance!

+More
From: "Peter Boyce" <botanist at malesiana.com> on 2007.04.30 at 22:21:42(15615)
Hi Jani,

Arum orientale is a highly variable
species in the same way as A. maculatum, A. italicum, &c.
Your A. orientale2 is pretty much 'typical' for the species. The image
of the spotted form is certainly an unusual plant. Did you notice if there was
any difference in the smell produced at anthesis? Other expressions have the
spadix appendix wholly yellow, or purple with a yellow stipe, or vice versa and
the spathe ranging from completely green to completely pale purple with all
intermediate combinations.

Your unknown Arum is A. rupicola
from Turkey and much of the middle east through into N. Iraq & N. Iran
west of the Caspian (replaced NE of the Caspian by A. korolkowii
and SE of the Caspian by A. jacquemontii), southern Azerbaijan,
Armenia. It also occurs on Lesbos and Cyprus. This is a highly variable species
with several synonyms of which A. conophalloides and A.
detruncatum are the most often seen.

Best wishes

Peter

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From: "Agoston Janos" <agoston.janos at citromail.hu> on 2007.05.01 at 01:51:14(15616)
Dear Peter,

Thank you for the explanation. For A. orientale I did
not nosed any difference.
The A. rupicola has came also as Dracunculus
vulgaris. You also helped me identifying A. dioscorides,
which came also from the same source as Dracunculus. Maybe a 3rd
Arum shows up, cause I have 3 Arum tubers...

I would like to ask you if it is possible, that these Arums do
not flower because of serious cold weathers? I have these tubers for 3 years
now, and this winters weather was very mild. We have had only -10 C. They
haven't bloomed yet, but tubers were big (compared to A. maculatum...)
and usally a tuber had 3 or 4 leaves. Is this possible?

Thank you for the ID!
Bye,
Jani

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From: "Peter Boyce" <botanist at malesiana.com> on 2007.05.01 at 15:34:17(15618)
Dear Jani,

It is certainly possible that some of your
Arum do not flower because of cold winters, especially the coastal
Mediterranean species (such as A. dioscoridis, A. creticum,
A. italicum, A. purpureospathum, &c.) which
experience a cool damp winter during which most of their foliage development
occurs following the autumn emergence of leaves.

However, for species from continental climates
(such as A. rupicola, A. korolkowii, &c.) the more
crucial aspect to ensuring flowering is hot summers to 'ripen' the
tuber. In nature these continental species experience a short, warm, wet
spring (wetness enhanced by snow melt), then a long and very hot (40+ C) dry
summer followed by a short, warm, wet autumn during which root development
starts but no aerial shoot emerges. The very deep (often nearly 1 m down) tubers
pass the intense winter in a 'ready to go' state and burst into growth with the
onset of spring, developing foliage, flowering and fruiting in the space of 3
months, with fruit dispersal occurring as the summer heat and drought begins to
bite.

In order to copy this you need to give these
species a long, dry summer rest BUT you need to be careful doing this in pots
since in the confines of a pot the tubers can overheat and desiccate. Remember
that in nature the tubers are very deep in the soil and buffered from the
extreme heat of the summer and also never fully dry; they tend to favour
limestone-derived terra-rossa clays that are not only ultra-fertile but also
moisture retentive.

Best wishes

Peter

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From: "Agoston Janos" <agoston.janos at citromail.hu> on 2007.05.04 at 02:29:51(15626)
Thank you for the cultivation tips! They did not get any hot
summer or mild winters except last year. They were planted under a tree, as
formerly I did not know how to tret them..

Tnak you again!

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