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In page Peanut:

"

The leaves are opposite and pinnate with four leaflets (two opposite pairs; no terminal leaflet); each leaflet is 1 to 7 cm (12 to 2+34 in) long and 1 to 3 cm (12 to 1+14 in) across. Like those of many other legumes, the leaves are nyctinastic; that is, they have "sleep" movements, closing at night.[citation needed]