NYCTAGINACEAE, Four-o’-clock Family
Herbs; leaves opposite; blades entire; flowers hypogynous, perfect, each flower or each cluster subtended by a
calyxlike involucre; calyx regular, coroUalikc. funnetrorm, 5-lobed. base constricted above ovary in such way that flower
appears epigynous; stamens 3-5; carpel. locule. and ovule 1; style slender, stigma capitate; fruit indehiscent.