Stenocactus obvallatus (rare spines) - 10 seeds
Stenocactus obvallatus is a ball-shaped cactus with wavy-margined ribs. White areoles each bear 5–12 greyish-brown spines. In spring, it has pale yellow to pale pink flowers, with a purplish-red stripe on each petal. Stenocactus obvallatus is strictly related to Stenocactus multicostatus. However, the two are easy to tell apart. E. multicostatus plants have many pale green ribs (as many as 120), where Stenocactus obvallatus typically has less than 50 blue-green ribs.