Species 900 in our area 48 (Gray); 43 (B&B)43
Distribution temperate regions
Flowers Cyme, regular, perfect, solitary or in clusters
#Parts 4-12 fused sepals, 4-12 fused petals, stamens fused to petals, alternate with petal lobes and equal petals in number.
Leaves simple opposite entire, may be fused across the stem.