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  [Aroid-l] Fw: Schismatoglottis species
From: botanist at malesiana.com (Peter Boyce) on 2008.06.23 at 03:10:17(17917)

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

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