My Pycnospatha arietina (a juvenille plant) had a
few thorns/prickles/spines on its petiole last year:
And also my unidentified Anchomanes also has a spiny
----- Original Message -----
Sent: Sunday, February 22, 2009 2:03
Subject: [Aroid-l] Thorns on Aroids
I would think that any thoughts or study
on the ''prickles/spines'' on aroids would start with the Lasiodeae.
genera in this group exibit extreme spines, one has not lived till one has
tried to handle or re-pot a plant of Lasia spinosa only to be left with the
tips of dozens of thorns inbedded in ones hands and fingers, to later fester
and become pustules.
The genus Cyrtosperma runs a close second, and
a specimen of C. macrotum I once had from N. E. Papua-New Guinea was very much
like a porcupine to touch, and impossible to handle without resorting to
leather gloves. All the other species in this genus that I can think of
Podolasia is no better, this genus produces a bloom where even
the stipe (the structure below the spadix which attaches the spadix to the
spathe/peduncle) is also spiney! Of interest, the spines on
Podolasia all point upwards, while those on Cyrtosperma all point
The exception is the African genus Lasimorpha, its many spines,
which run in parallel rows along its petioles, are sort of ''crystaline'', and
somewhat ''blunt'', so handling has not been a problem for me.
A few of the
Old World genera are not spiney, the Indian Anaphyllum, and the Asian
Pycnospatha have at best ''rough'' petioles.
The Neotropicis have been kind
to us with their Lasioid genera, Anaphyllopsis, Dracontioides, Urospatha all
are spineless (though there are a couple (?) of species (?) of Urospatha in
Fr. Guyana with ''roughish'' petioles), while the genus Dracontium is
interesting in that certain species, the petioles demonstrate structures which
look like spines, but are generally soft and not ''dangerously'' sharp!
don`t know the origin of these spines in Aroids, but they must be a good form
of defense against browsers and even perching birds, etc.
I hope this
assists our friend Dmitry in his research.
> To: firstname.lastname@example.org
Fri, 20 Feb 2009 14:36:19 +0800
> Subject: Re: [Aroid-l] Thorns at
> Dear Dmitry,
> As I mentioned in my
last email, we are really not all aware of what role
> such prickles
might play in the aroids. As Tom has also mentioned they occur
Neotropical Homalomena too. The definition of a thorn is an indeterminate
> structure (such as a stem or root) capable of lateral growth through
> branching (and even of flowering and bearing leaves in some
> have a protective role. Thorns are most commonly
found in Rosaceae (e.g.,
> Crataegus), Fabaceae (notably Gleditschia)
and Rhamnaceae (many genera).
> Very best
> ----- Original Message -----
> Sent: Wednesday, February 18, 2009 8:19
> Subject: Re: [Aroid-l] Thorns at anubiases
> > Dear Peter,
> > This error in terms is
probably caused by features of transfer between
> > Russian and
English. In Russian such epidermal outgrowths are called as
thorns. Indeed, I found in the literature that J. Bogner named them as
> prickles, but he does not write about their role. I have only few
> knowledge about others Aroids. Therefore, could You tell me about a
> > of such prickles in Anubias?
> > Best
> > Dmitry Loginov
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