----- Original Message -----
From:
Peter
Boyce
To: Discussion of aroids
Sent: Wednesday, May 02, 2007 12:34
AM
Subject: Re: [Aroid-l] arums + arisaema
triphyllum
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
----- Original Message -----
From:
Agoston Janos
To: Discussion of aroids
Sent: Tuesday, May 01, 2007 4:51
PM
Subject: Re: [Aroid-l] arums + arisaema
triphyllum
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
----- Original Message -----
From:
Peter
Boyce
To: Discussion of aroids
Sent: Tuesday, May 01, 2007 7:21
AM
Subject: Re: [Aroid-l] arums +
arisaema triphyllum
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
----- Original Message -----
From:
Agoston Janos
To: AROID-L
Sent: Monday, April 30, 2007 10:54
PM
Subject: [Aroid-l] arums + arisaema
triphyllum
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!
Bye,
Jani
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