Terminology

[goodgollymissmolly]

Alba is often used to mean the lack of anthocyanin (red) pigment. So some yellow flowers are called alba. More often flava or aurea (Greek and Latin) is used to describe yellow.

Consequently alba is not strictly white always.

Ray is correct 'typo' is typical as lavender in cattleyas. The typo color is the usual lavender color.

While there are charts like the one posted, there is no strictly followed definition for these terms.