Mark Hasslock Mayfield

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Euphorbia ouachitana, commonly called Ouachita spurge, is a species of flowering plant in the spurge family (Euphorbiaceae). It is native eastern to North America, where its range is restricted to the Ouachita and Ozark Mountains, with disjunct populations east in the Nashville Basin. Its typical natural habitat is semi-open forests and woodlands, usually associated with thin soils underlain by shale or limestone. Before it was described as a separate species in 2013, it was typically considered to be the same species as Euphorbia commutata. Distinguishing characters of Euphorbia ouachitana

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Dirca mexicana, the Mexican leatherwood, is a low shrub with a very restricted population in Tamaulipas, Mexico. However, it does surprisingly well in the much colder environment of Ames, Iowa. Like most Dirca species, it blooms in early spring.

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