Purple Lotus

Purple Lotus is a Herb found in Felwood that can be gathered with Herbalism (210).

Purple Lotus is one of the four types of Lotus and the most common of the four types. Visually, it appears to be a purple flower and a little bit of white/green near the ground.

Tainted Moths prefer to feed on Purple Lotus nectar.

Source
Purple Lotus can typically be found around troll, night elf and titan ruins in Felwood. There is a chance that one harvesting a Purple Lotus may find a Wildvine. Since the Shattering, Purple Lotus can only be found in Felwood.

Prior to the Shattering, Purple Lotus could be found in:
 * Tanaris
 * Azshara
 * Stranglethorn Vale
 * The Hinterlands
 * Feralas
 * Badlands
 * Ashenvale
 * Dire Maul
 * Zul'Gurub

Alchemy

 * Magic Resistance Potion
 * Elixir of Greater Water Breathing
 * Wildvine Potion
 * Philosopher's Stone
 * Dreamless Sleep Potion
 * Elixir of Dream Vision

Tailoring

 * Cenarion Herb Bag

Enchanting

 * Lesser Mana Oil
 * Brilliant Mana Oil

Inscription

 * Violet Pigment
 * Ruby Pigment