Echinocereus in bloom
This was sold to me as Echinocereus pamanesiorum. I am not certain it is that species. These flowers are about 3.5" / 9cm in diameter.
It is definitely an Echinocereus. It has the short-columnar stems with many ribs, clumping from the base, and bright green pistil lobes. Flowers in this genus erupt through the epidermis, leaving a permanent scar. Fruits are spiny. Some are edible and delicious.
They are from North America. Most species need lots of direct sunlight; these species are not as easy to grow in more northerly climates as some other cacti. There are grassland species, accustomed to dappled shade, that do better in temperate greenhouses.
Some species grow in areas with very cold winters, from northern and eastern Arizona into Utah and Colorado, or from Texas into Missouri. Some have lemon-scented flowers!
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