Rio San Miguel watermelon 

Origin - Originally from an isolated area near Polanco, Chihuahua, Mexico.

Days till harvest -

RindSolid green fruits are small and round.   Flesh - Pale flavorless flesh.   Fruit weight -   

Grown by the Tarahumaras for the plentiful edible seeds which are black, red and mottled.

My Notes:   

 Seeds available from nativeseeds.org   USA