Viburnum L.

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1976, Flora Europaea. Volume 4. Plantaginaceae to Compositae (and Rubiaceae), Cambridge University Press : 45

2. Viburnum L. 1

Shrubs or small trees. Leaves simple, deciduous or evergreen, stipulate or exstipulate. Flowers in cymose corymbs, actinomorphic, but sometimes the marginal flowers of the inflorescence enlarged, somewhat zygomorphic and sterile. Calyx 5-lobed. Corolla 5-lobed, rotate to campanulate. Stamens 5. Style short; stigma 3-lobed. Ovary 3-locular, with one fertile loculus with a single ovule and 2 sterile loculi. Fruit a drupe with a single, globose pyrene.

1 Leaves lobed; outer flowers sterile, much larger than inner 1. opulus

1 Leaves entire or serrulate; flowers uniform 2 Leaves deciduous, not coriaceous, serrulate; twigs with dense, greyish, stellate pubescence 2. lantana

2 Leaves coriaceous, evergreen, entire; twigs glabrous or sparsely pubescent 3. tinus