From what the Dutch bulb/rhizome experts told me (these guys are rarely if ever wrong) all Eucrosia bicolor are clones of the same individual as nobody managed to get the plant to go to seed in captivity yet. That's why there's limited interest in growing them, as showy hybrids are the backbone of the bulb/rhizome trade.
As far as cares go E. bicolor needs filtered sunlight. This means full sun with, say, a white curtain in the middle. Direct hot scorching sun will cause the plant to dry up quickly, and you don't want that to happen as this is a plant that needs plenty of water during growing season.
E. bicolor has the same requirements as Zantedeschia (Arum lilies) to flower, meaning a dry winter dormancy to trigger blooming in the Spring.
Sorry for not being able to tell you more but with little interest in growing these plants commercially information are very hard to come by.
