Vanda coerulea Lindley (1847.)
The photo shows selected, extremely dark blue clone of the species. Old litographs give much better idea about the true appearance of the wild form and comparing the two images can be thought-inspiring concerning what can be achieved horticulturally ...
Limodorum tankervilliae
H. Andrews: Botanist's Repository for New and Rare Plants. etc.
London, 1797-1814.