Re: Fw: Schismatoglottis species

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D. Christopher Rogers

Senior Invertebrate Ecologist/ Taxonomist

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EcoAnalysts, Inc.

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Davis, CA 95616

USA

 

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Colocasia & Xanthosoma, & Alocasia (for the most part), have very distinctive 'colocasioid' venation with primary veins running pinnately off both sides of the mid-rib with the secondary veins arising from the primary veins and uniting between the primary veins into more-or-less sinuous interprimary collective veins. I have attached a photograph of this typical 'colocasioid' venation. No Schismatoglottis have such venation, although the aptly named S. colocasiodea approaches it (see attached image). An additional problem is that not all Alocasia have 'colocasioid' venation and a much more reliable method in differentiating Alocasia is that there are glands, often waxy, in the axils of the primary veins on the abaxial side of the leaf; these glands are never present in Schismatoglottis.

 

Additional useful characters are that Xanthosoma and Colocasia both have slightly to very milky latex from cut tissue. A few Alocasia have milky latex (A. macrorrhizos) for example, but for the most part the say is clear.

 

Hope this helps some

 

Peter

 

 

----- Original Message -----
From: Christopher Rogers
To: 'Discussion of aroids'
Sent: Sunday, June 22, 2008 11:17 AM
Subject: Re: [Aroid-l] Fw: Schismatoglottis species


Wow. Okay, so is there an easy way to separate Schismatoglottis, Alocasia, Colocasia and Xanthosoma just by the leaves?
 
D. Christopher Rogers
Senior Invertebrate Ecologist/ Taxonomist
((,///////////=======<
 
EcoAnalysts, Inc.
1.530.756.4481
1.530. 383.4798 (cell)
1307 "L" Street
Davis, CA 95616
USA
 
ŸInvertebrate Taxonomy
ŸEndangered Species
ŸEcological Studies
ŸBioassessment
ŸInvasive Species
ŸPlankton
ŸPhycology
 
Moscow, Idaho Ÿ Bozeman, Montana Ÿ Davis, California Ÿ Joplin, Missouri
Selinsgrove, Pennsylvania
ecoanalysts.com
 
From: aroid-l-bounces@gizmoworks.com [mailto:aroid-l-bounces@gizmoworks.com] On Behalf Of Peter Boyce
Sent: Friday, June 20, 2008 2:14 PM
To: Discussion of aroids
Subject: [Aroid-l] Fw: Schismatoglottis species
 
Hi Leyland,
 
I think that the server may have stripped the image; am resending.
 
Pete



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