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"Poisonous" does not mean deadly. Some manifestations of toxicity are subtle. The dose, as always, determines if a plant is safe source of nutrients or a toxic hazard.

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BRIEF: Are these wildflowers toxic?

Are the following wildflowers toxic? blue flax gaillardia Siberian pea shrub


Flax seed (Linseed) meal contains a number of toxins that need to be considered if you were feeding buckets of raw linseed to ponies, but I don't think a few plants in the mix are going to be a problem. Flax does have some cyanogens, a glucosinolate and some amino neurotoxins. But nibbling a couple stems in a pasture of other feed won't do much. Some people get a rash from the gaillardia. I don't know the Siberian pea shrub.