Essential is lavender (Lavandula angustifolia), an evergreen Mediterranean plant that belongs to the same family as mint and sage. (naturadoriente.com)
Clitoria has the standard rolled inward (like a spoon), and the standard is usually a lavender color with a purple center. (ncparks.gov)
Lavendula1
Lavendula angustifolia) , Chamomile ( Matricaria recutita), Passionflower ( Passiflora incarnata), Stevia (Stevia rebaudiana) & Butterfly Pea Flower ( Clitoria ternatea) , giving the infusion a vibrant purple colour. (pachamamaremedies.com)
Mariana2
This species shows vein reticulations on the undersides of the leaflets, to differentiate a non-flowering plant from its "cousin" -- Clitoria mariana -- which has no obvious vein pattern visible on the underside of the leaflets. (ncparks.gov)
Butterfly-pea" is a name usually assigned just to Clitoria mariana , but at times is given to Centrosema . (ncparks.gov)