Persicaria odorata herb is believed to repress sexual urges. A saying in Vietnamese states, ""rau răm, giá sống"" ("Vietnamese coriander, raw bean sprouts"), which refers to the common belief that Vietnamese coriander reduces sexual desire, while bean sprouts have the opposite effect. Many Buddhist monks grow coriander in their private gardens and eat it frequently, believing it helps them remain celibate. Persicaria odorata Persicaria odorata, known as rau răm or Vietnamese coriander, is an herb whose leaves are used in Southeast Asian cooking. Other names for this herb include Vietnamese mint, Vietnamese cilantro, Cambodian mint, hot mint, laksa leaf, and praew leaf.
Leaf power powers for bounded values of have bounded clique-width, but this is not true of leaf powers with unbounded exponents. A graph is a 2-leaf power if and only if it is the disjoint union of cliques (i.e., a cluster graph). A graph is a 3-leaf power if and only if it is a (bull,dart,gem)-free chordal graph. Based on this characterization and similar ones, 3-leaf powers can be recognized in linear time. Characterizations of 4-leaf powers are given by and , which also enable linear time recognition. For "k" ≥ 5 the recognition problem of "k"-leaf powers is open, and likewise