This section is from the book "Commercial Gardening Vol2", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
A genus containing several species of pretty bulbous plants, mostly North American, and fairly easy to grow. There is a fair trade in the bulbs (or conns) in the autumn, when they are planted in well-drained soil. One of the best-known species is B. uniflora (formerly better known under the names of Milla and Triteleia), which has white flowers. Other kinds are: californica, rose purple; capitata, lilac or violet, with a white variety; congesta, deep violet; Douglasi, bright blue; gracilis, bright yellow; grandiflora, violet blue; Hendersoni, salmon yellow striped with purple; Howelli, porcelain white, striped blue, and its fine variety lilacina; hyacinthina, purple; Orcutti, lilac; Purdyi, rose purple; etc.