The flowers are usually yellow in colour, but W. Gertel and W. Krahn have also observed plants with stiff spination and lilac-red flowers. The spination is also different in their development and are much more rigid than the type plant described by Cardenas of S. vizcarrae . It seems that Rausch's plant is closer to S. torotorensis . Violet , KK 1771. The recent finds by Heinz Swoboda have produced forms of S. vizcarrae with white and pale pink flowers, HS 44 and HS 44a.
Further study is necessary.
White and pale pink flowers are also found in S. flavissima , and in many populations of S. breviflora . The root system is fusiform with two or more thickened roots rather than a single tap-root. May. Pag e 3 Copyright Succulenta.