Notocactus ubelmannianus (Parodia werneri) Has a small purple to magenta bloom with yellow center no more than 1-1/2 to 2" in diameter, native to Brazil in the area of Rio Grande Do Sul. Growth is globular and short/squatty, blooms at 3" diameter in growth. They are popular in cultivation, but must be grown indoors where temperatures fall below 10 °C.