From Queretaro, Mexico, this Mammillaria forms dense clusters. We’ve seen this little guy called M. marnier-lapostollei, M. camptotricha cv marnier-lapostollei or curvispina, or just M. camptotricha Marnier. The green body is mostly obscured by whitish curving spines, and the apex tends to have yellow spines. The flowers are small and white. These seedlings are available in 4-inch pots.