This South African corm used to be known as Freesia refracta and I have previously called it (incorrectly) Freesia lactea. It may be a hybrid of Freesia alba crossed with Freesia leichtlinii. Whatever its name, it is one of the icons of Sydney gardens in early spring! It has a fan of narrow, sword-shaped leaves (ht to 30cm), from which arise wiry stems of creamy white, goblet-shaped flowers, which appear around late August to September and have a beautiful scent. Sometimes the petals are flushed with subtle purple tones. They are useful cut flowers.
They prefer to grow in sunny, well-drained spots in the garden, and can be left undisturbed to form large drifts, or else dug up and divided every three years in autumn. They can also be grown in pots.
They are attractive grown around spring-flowering shrubs, such as creamy Loropetalum chinense. There are many other larger hybrid Freesia, which come in a rainbow of colours, but most lack the perfume of the species and seem to need staking - to me they just don't have the same charm as this one.
Note that in some areas, it is regarded as having weed potential.