wild wheat could perhaps help you.

I looked up "rustique" in the PLI: qui résiste aux intempéries (Agriculture).

I found several sites under rustic wheat. Just type " rustic wheat " in any search engine. SEE FOR EXAMPLE :


FORMULAS AND BAKING TIPS • Rustic Wheat Bread




Prepare natural starter by combining 2 lbs.
water with barley malt. Mix in 1 lb., 4 ozs.
each of white wheat flour and whole wheat
flour to form moist dough. Cover; let rise at
room temperature for 24 to 36 hours. Starter

in the sense of untreated, unbleached, hence more "rustic"
I did a quick check on Internet on the sites that sell spelt and natural wheat is how they would describe. Also there is a cereal that I like with spelt in it which is called "ancient grains".
Regards,
Paola L M

see below
Mosher - All natural Wheat and Grain Products.
Grains Available: Wheat, Amaranth, Triticale, Soybeans, Spelt, White Wheat, Peas, Blue Corn, Dehulled Millet, Flax, Hulless Oats, Hulless Oats Flakes, Corn and Beans. Whole grains are guaranteed to sprout.
Make delicious, nutritious and healthy breads and cereals. Add to soups, stew and casseroles. You can pop it for a crunchy snack or as a salad topping, or even make it sprout to use in salads. Wheat gluten also serves as an excellent meat substitute

I am not sure about this but I have heard about it in vegetarian circles. The French translation is "blé sarrasin" or "blé noir".