Unit 22 (022)

1. Viburnum species

Bud, stem, and leaf characteristics make it possible to separate some of the species.

Imbricate or overlapping bud scales are found in Viburnum dentatum.

Naked or foliose buds and scurfy or brown scaly new stems are found on Viburnum

x burkwoodii, Viburnum carlesii, Viburnum lantana, Viburnum x rhytidophylloides, and

Viburnum rhytidophyllum.

A ring of sterile outer flowers (fertile flowers small and in middle) is found on Viburnum

alnifolium, Viburnum opulus, Viburnum plicatum forma tomentosum, and Viburnum

trilobum.

Several viburnum have thin, finely toothed, cherry like leaves, often with a winged

petiole or wide leaf stalk. These are Viburnum cassinoides, Viburnum lentago, and

Viburnum prunifolium.

The earliest flowering viburnum is Viburnum farreri.

Viburnum opulus and Viburnum trilobum have glands on the petiole. Most Prunus

leaves have glands on the petiole or leaf stalk. (see Unit 024).