Notocactus crassigibbus houseplant Mammillaria boolli is a clumping

Mammillaria boolli is a clumping plant with soft

even though it's not a cactus

the rosette grows alone

senilis (Eriosyce senilis) typically has thin twisted white spines and flowers with few bristles and wool

Notocactus crassigibbus houseplant Mammillaria boolli is a clumpingRecommended temperature Zone: USDA: 9b 11 Frost tolerance: Hardy to 23F ( 5C) for short periods Flowers: Huge beautiful yellow flowers that will expand up to 10 cm across Sun exposure: Light shade Origin: Brazil (Rio Grande do Sul) Watering needs: Regular water in summer. Keep rather dry in winter, rot easily if the substrate is wet and cold, tends to lose its roots in winter. Some of the information in this description has been found at desert