[quote=Shortie;21062]They do look similar don't they?
[quote]
Just to mention that the Chilean Potato Vine (Solanum Crispum) and Potatoes (Solanum tuberosum) are in the same plant family, hence similar flowers.
Also Tomatoes (Solanum lycopersicum) and Eggplant (Solanum melongena) as well. Its the flowers on the plants that taxonomists study to classify plant families.
More info here...
http://en.wikipedia.org/wiki/Solanum
Potatos sprouting in the compost heap are possibly the product of potato peelings, or those very small spuds that got thrown out.