[S. rugosa and var. coronata (Rüst in Monatsschr. Kakt. vi. 40, not of Jacquin) are hybrid forms unlike S. rugosa, Jacq., with corollas 2 1/2 in. in diam. and ovate acuminate lobes, not ciliate; in rugosa yellow, with irregular purple-brown spots and very slender lines between them; annulus circular, paler yellow than the lobes, but very thickly covered with rather large confluent purple-brown spots; outer corona-lobes oblong-linear, 3-toothed, with the middle tooth minute, pale yellow, with a purple central stripe and darker dots on the apical part; inner corona-lobes with the outer horn spreading. VAR. coronata; lobes pale sulphur-yellow, irregularly variegated with dark purple-brown spots and markings, with slender lines between them; annulus circular, with the margin and inner part crimson-brown leaving a very irregular ring of light yellow between; corona as above, but the outer corona-lobes narrowed at the teeth.]