May 10, 2012
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Southeastern, New Hampshire
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The 5-lobed white flowers formed into flat-topped infloresences and
opposite leaves were a couple keys to see that this is a Viburnum. Two of
the keys to determine what type of Viburnum is whether the leaves are
lobed and whether there are prominent leaf veins that may branch,
but run all of the way to the teeth. In this case the answer to both
questions is, “No.”
Using the new botanical guide by Arthur Haines,
Flora
Novae Angliae: A Manual for the Identification of Native and Naturalized
Higher Vascular Plants of New England, you can see the flow of steps used to
identify this species of Viburnum:
- Leaf blades not lobed.
- Winter bud has scales. Only two other Viburnums in New England have unlobed
leaves and no leaf bud scales: Hobblebush (Viburnum lantanoides) has very large
leaves with a large sterile flower surrounded by small fertile flowers. Wayfaring Tree
(Viburnum lantana) has gray stellate (star shaped) hairs on the back of the leaves
and there is a short stalk of the inflorescence (penduncle).
- Leaf blades with many-forked and not prominent pinnate veins that do not extend
to the tip of the teeth. Winter buds with 2 valvate scales.
- Inflorescence (cymes) not elevated on a peduncle.
- Leaf stem (petiole) 10-20 mm long and has a wavy or tiny tooth-like projections.
Some leaf blades have an acuminate tip (gradually tapering to a point with concave
sides along the tip). I could not find many acuminate tips. There were only a few.
But it is not Smooth Blackhaw (Viburnum prunifolium) because those leaf
petioles are only 5-12 mm long.
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