https://www.atlasobscura.com/articles/what-is-yaupon-tea-cassina

"In the modern South, cassina, usually known by the name yaupon, is just a plant: a border shrub or small tree in residential developments. (Americans regularly walk by the caffeine-producing plant on their way into coffee shops that source beans from the other side of the globe.)"

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Yaupon Tea

https://www.thespruceeats.com/yaupon-tea-5097556

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Yaupon Leaves Are Safe, but Don’t Eat the Berries

https://naturallysavvy.com/blog/yaupon-leaves-are-safe-but-dont-eat-the-berries/