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Euphorbia pinkavana
related to Euphorbia pulcherrima, which is known in México as "noche buena", related to Christmas celebrations.
Endemic of gypsum dunes at Cuatro Ciénegas Basin. Chihuahuan desert.
This species doesn't have a common name that I'm aware of. So, the common name is one I made up from the scientific name (fruticose referring to shrubs). Sandmat is a common name for a lot of species in E. sect. Anisophyllum.
E. pinkavana is a part of the Tithymalus group which has alternate leaves on at least part of the stem. This has opposite leaves and appears to have well defined stipules. Furthermore, E. fruticulosa is supposed to grow well in gypsum (though not exclusively). Alternatively, this could be E. fendleri but I'm pretty sure E. fruticulosa is a better fit as E. fendleri has typically has narrower stems at the base.