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Cultivars include:
C. byzantinum - to 32cm tall. This is possibly a hybrid with pale pink flowers 10-12cm long, followed by folded leaves to 10cm wide. It is a reliable garden form.
C. luteum - flowers to 10cm tall. The leaves are 25-30cm and appear with the flowers but grow to maximum height after the flowers have finished.
C. melanthioides - a tropical species which produces white flowers and leaves at the same time.
C. speciosum - mauve flowers to 15cm tall followed by leaves to 35cm high.
This genus is widespread originating in Western Asia, Europe, and East Africa down to South Africa. There are somewhere between 65 and 160 recognised species.
Ebook - Great colourful reference - professionals, home gardeners: all you need to know to grow bulbs for pleasure and profit.
Ebook - Identify, select, grow, care, propagate, landscape, dictionary of perennials.
Course - for the professional grower or hobbyist.
Very comprehensive - great starting point to your career in horticulture.