Notes

S. lunata, Dammann, and vars. umbrosa and minuta (Rüst in Monatsschr. Kakt. vi. 43) are either hybrid forms or slight variations of S. variegata, var. marmorata, differing only as follows:— S. lunata, corolla-lobes minutely ciliate, very dark purple-brown or blackish-purple with a pale yellow crescent-shaped marking and 2–3 specks near the apex of each lobe and a pair of yellowish marks at each sinus; annulus rather lighter than the lobes, speckled with yellow. Var. umbrosa, corolla-lobes not ciliate, somewhat reticulated with whitish-yellow at the tips only; annulus with larger whitish markings; outer corona-lobes with dots at the apical part only, no central stripe. Var. minuta, corolla-lobes minutely ciliate, with a pale yellowish marking something like a flattened ring with 2 teeth on each; annulus with a few small yellowish marks; outer corona-lobes with the teeth slightly diverging. S. marmorata, Rüst, l.c. 38, is totally different from S. marmorata, Jacq., and merely a hybrid form of S. variegata with a corolla 2 3/4 in. in diam., minutely ciliate on the lobes, which are margined and marked with a few large spots and blotches of dark purple-brown; annulus paler with a few smaller purple-brown spots.