Warnaar and Co., the Netherlands
Year Registered: 1933
Shanghai
Percival D. Williams, England
Year Registered: 1927
Crocus
Perianth segments broadly ovate, blunt, slightly mucronate, inflexed, concave in upper half, smooth, overlapping one-third to a half; the inner segments more narrowly ovate, with margins sometimes nicked at shoulder; corona cylindrical, lightly ribbed, mouth expanded and more heavily ribbed, rim rolled and more or less deeply notched and crenate.
There are no photos of "Pretoria" in Daffseek.