Convolvulaceae de Mongolia

Ron, thank you so much for all the information.

That is a shocking (and very interesting) data!!
But I find it hard to believe.
In my area Convolvulus arvensis, C. althaeoides and C. lineatus (among others) coexist and are quite frequent.
Nevertheless, I have never seen any hybrid, not even a single specimen of doubtful identity.
Flora Iberica (a reputable publication) did not mention any hybrid within genus Convolvulus in Spain + Portugal.

I will investigate this issue further.

Best wishes.

 

Hey Fer - I wish I could remember the exact studies where people started in Mongolia and worked their way around, eventually traveling east and analyzing all of the Convolvulus, because you would indeed be 'shocked'...I know I was...in lieu of that , you could take a look at some of the following...

Remember that Inter-specific cross compatibility is a "wide range" from "totally cross incompatible" to "totally cross compatible"...

The term "open pollinated stable" is a highly variable range which evolves over time...

You mentioned :

"Nevertheless, I have never seen any hybrid, not even a single specimen of doubtful identity."

Look with different / new eyes...

I suppose the best place to start to find "how to hide a hybrid" is right in the open...i.e., in your own backyard...
http://onlinelibrary.wiley.com/doi/10.1111/j.1095-8339.2007.00657.x/abstract

New natural hybrids of Convolvulus (Convolvulaceae) from Turkey
http://onlinelibrary.wiley.com/doi/10.1111/j.1756-1051.2011.01164.x/abstract

Convolvulus x cyprius
http://www.sbaadministration.org/in...eco-plants/85-aeeic-bio-convolvulus-x-cyprius


Calystegia sepium x silvatica = C. x lucana
https://data.nbn.org.uk/Taxa/NBNSYS0000161452

Calystegia species interspecific hybrids
http://protist.i.hosei.ac.jp/asagao/yoneda_db/e/species/hybrids5.html
http://protist.i.hosei.ac.jp/asagao/yoneda_db/e/slides/slide240-250.html

Keep following the trail...amaze yourself and your friends...