Stems spreading, major stems cylindrical side shoots flattened and with scalloped edges. Flowers nocturnal, fragrant. Fruit red.

Mexico, Guatemala

 

Related plants with scalloped or toothed margins include E. pumilum (Vaupel) Britton & Rose from S Mexico and Guatemala, E. crenatum (Lindl.) G. Don from Mexico to Hinduras, and E. phyllanthus (L.) Haw. from Panama to Brazil (for differences see key). E. stenopetalum (Frst.) Britton & Rose from Mexico has flowers with numerous extremely narrow, creamy petals.

Source: Thompson, A, ; Forbes, S.; Spencer, R. (1997). Cactaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.