Echinocereus subinermis

Echinocereus subinermis is a common in culture plant, native to Sonora state. With low ribs and short spines it can easily be mistaken for Echinopsis when not in flower - the overall plant look is very similar. Flowers of cause will reveal the true identity.
This species flowers yellow, not the most common color among Echinocerei. Flowers are produced reasonably easy.