Examples from the Web for bicolor
Punctata is probably the hardiest, but regia and bicolor are also hardy if planted about six inches deep.The Book of Bulbs|Samuel Arnott
The horticultural characters of Bicolor are much the same as those of Aestivalis.The Grapes of New York|U. P. Hedrick
The horticultural characters of Bicolor are much the same as those of stivalis.
Like stivalis, Bicolor does not thrive on limy soils and it is difficult to propagate from cuttings.
He makes the same remark for the allied forms (bicolor, saccharatus, etc.), which are often regarded as mere varieties.Origin of Cultivated Plants|Alphonse De Candolle