I have CA poppies and several others. Send me an email and I will let you know what I have. Also, Chaparral is the type of ecosystem, not sure what specific plant you were talking about, but I have several plants that grow in the Chaparral.

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Pink wildflowers that will do well on roadsides in north Texas include Wild Bergamot - Monarda fistulosa, and coneflowers. There is the Pale Purple Coneflower - Echinacea pallida?, and Purple Coneflower - Echinacea purpurea, which really is more pink than purple. The cosmos shown above isn't native to the US, so I wouldn't call it a wildflower. It is an easy to grow annual that might be a good choice for the first year or so before the perennials fill in. Don't plant the cosmos too thick or they will shade the others and the others will be slower to fill in.

It's a weedy euphorbia. I'd pull it. It's already blooming and will set seed in a few days. Wear gloves: the sap can cause allergic reactions in some people.