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Hypogynous bristle short and enclosed in the perigynium or none.

Petals and stamens numerous, on a thick hypogynous receptacle or inserted upon the ovary.

Stamens indefinite on an hypogynous disk, not covered in the bud.

Petals 4, hypogynous, regular, placed opposite each other in pairs, their spreading limbs forming a cross.

Herbs or shrubs, with opposite entire dotted leaves and no stipules, regular hypogynous flowers, the petals mostly oblique and convolute in the bud, and many or few stamens commonly collected in 3 or more clusters or bundles.