Cattleya walkeriana Cattleya walkeriana Cattleya walkeriana (Walker's cattleya) is a species of orchid. It differs from most species of "Cattleya" by having inflorescences which arise from the rhizome instead of from the apex of the pseudobulb. In its native habitat (Brazilian Central Plateau) it grows as either an epiphyte or a lithophyte, sometimes in full sun. Pseudobulbs are relatively short, bulbous or fusiform, with one or two ovate leaves at the apex. Inflorescence is one- or few-flowered, about 8" (20 cm) tall. Flowers are 4-5" (9-12 cm) across. Genetically "C. walkeriana" is close to bifoliate Cattleyas. The diploid chromosome number of "C.
Portia labiata and from Sagada, both in the Philippines, have slightly different hunting tactics, and Los Baños has some very dangerous prey spiders. In laboratory tests, Los Baños "P. labiata"s rely more on trial and error than Sagada "P. labiata"s in finding ways to vibrate the prey's web and thus lure or distract the prey. Around Los Baños the web-building "Scytodes pallida", which preys on jumping spiders, is very abundant. All members of the genus "Scytodes" spit a sticky gum on prey and potential threats, and this can immobilise a "Portia" long enough for the "Scytodes" to wrap the "Portia" in silk