List of C. Walkerian Variations
 

I've had this list since 2005. I doubt that it is complete.

Alba - Petals, sepals, labellum and column should be pure white. Frequently, a greenish color is present on the column and on the apexes of the petals and sepals. The flower may also exhibit a creamy yellow coloration along the longitudinal grooves of the labellum, that is underneath the column.
Albescens - Petals and sepals are white colored with a very faint hint of rose pink. The column may have a light rose shade or have the same green coloration like the alba variety. A green color on the apexes of the petals and sepals can also be present. The backside of the sepals will sometimes show traces of pigmentation.
Amoena - Petals and sepals are pure white. Its labellum should have a light, rose lilac color that partially covers the medial lobe or can be in the form of delicate, colored grooves or veins.
Aquinii - The petals' apexes and its surrounding areas have the same tonality and color as the labellum. The petals and sepals occasionally have a longitudinal line in the center that starts from the midlobe and goes all the way to the apex.
Caerulea (Coerulea) - Petals and sepals have a bluish color of variable intensity and tonality with the labellum having a more intense blue coloration on the midlobe.
Caerulens (Coerulens)- Petals, sepals and midlobe of labellum have the same light blue coloration. Almost like a concolor but bluish hue.
Concolor - Petals, sepals and labellum have the same color of similar intensity. The labellum may show a creamy white color beneath the column.
Fantasia - Also known as suave but often referred to as "fantasy" or "false semi-alba". The petals and sepals are almost white, with a hint of rose, whose intensity may vary. Sometimes, the column and the apexes of the petals and sepals may have a tinge of green coloration. Labellum can be light rose or white accompanied with light rose grooves or veins.
Flamea - Petals and sepals are white or lilac in color with the petals exhibiting a more intense lilac color near or at the apex. Midlobe of the labellum should have the same tonality but much deeper in intensity.
Lilacina - Petals, sepals and the labellum's midlobe section all have the same intermediate coloration between lilac and bluish intensities.
Perola (Pearl) - Sepals and petals (or just the petals) have a faint hint of rose pink on both sides of a white flower. The labellum's lilac coloration can vary in intensity, ranging from light lilac to crimson. Some flowers may have a greenish color on the column and on the apexes of the petals and sepals.
Rosada (Rose) - Sepals and petals have a rosy or light lilac coloration. Labellum has a more intense lilac color on the midlobe.
Rubra - Sepals and petals have an intense, dark lilac coloration. Labellum should be dark lilac, nearing crimson in color, on the midlobe and lateral lobes.
Semi-alba - Petals and sepals are white colored with no signs of pigmentation on the back of the sepals. The labellum should have a dark lilac color with or without grooves or darker colored veins. Some flowers may have a greenish color on the apexes of the petals and sepals.
Striata - The petals' apexes and its surrounding areas have short streaks or lines of more intense lilac color than the rest of the petal or sepal segments.
Tipo - Petals and sepals have lilac coloration. Labellum has a more intense lilac color on the midlobe. This is the color type of the specimen used to describe the species.
Vinicolor - Petals, sepals and labellum have a red wine color. Labellum may also have a more intense red wine coloration than other parts of the flower.

First C. Walkeriana Flower of the Season - ‘Mirtha Isabel Oliveros'
 

Accidental Post - Ignore

Lou Menezes book discusses variations in depth. Do you have her book?

No. Where can I find it?

-Keith

Not sure! You might have to poke around. Here’s a better description of the book: Book Review - Cattleya walkeriana