Just Dioscorea

? ? atlas_titan@hotmail.com
Fri, 02 Jul 2010 15:00:56 PDT
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> From: jimmckenney@jimmckenney.com
> To: pbs@lists.ibiblio.org
> Date: Fri, 2 Jul 2010 11:12:08 -0400
> Subject: Re: [pbs] Just Dioscorea
> 
> I'll bet the one in your garden is Chinese yam, Dioscorea oppositifolia
> (widely known as D. batatas). It's a terrible pest in many areas and is
> widely considered to be "officially" invasive in some states. This species
> forms large tuberous roots and small aerial tubers. I've never seen a
> variegated form however. This species and D. japonica are similar, although
> web photos of D. japonica show very upright conspicuous spikes of flowers.  
> 
> The ones you saw with big aerial tubers might have been D. bulbifer.
> According to the wikipedia account, the tubers of this one range from edible
> if boiled to toxic. It is probably not hardy northward but is feral in
> Florida. 
> 
> Jim McKenney
> 
> 
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