Origanum Vulgare: Commonly called oregano, but has been called wild marjoram. Origin: It is native to warm- temperate western and southwestern Eurasia and the Mediterranean region. Appearance: Oregano is a perennial growing to 20 inches, with pink flowers and spade-shaped, olive-green leaves. It prefers a hot, relatively dry climate, but will do well in other environments. Taste: Oregano has an aromatic, warm and slightly bitter taste. It is a close relative to marjoram.