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Viburnum

See list of 13 species in this genus

Species with 3-lobed leaf blades often will produce unlobed blades at the apex of shoot growth. Therefore, these leaves should not be used for identification purposes. Reference: McAtee (1956).

  • 1a. Leaf blades 3-lobed (sometimes the most apical pair of the shoot with simple blades) 
 [Fig. 314]
    • 2a. Bud scales 3 or more, generally at least sparsely pubescent; branchlets pubescent with stellate hairs; petioles lacking glands; drupe dark blue to dark purple
    • 2b. Bud scales 2 (sometimes appearing as 1), glabrous; branchlets glabrous or stipitate-glandular, not stellate-pubescent; petioles with raised glands; drupe red
      • 3a. Marginal flowers of inflorescence not enlarged, fertile, similar in morphology to other flowers in the inflorescence; leaves without stipules, the blades usually toothed in the sinuses; petiole glands usually at very summit near edge of leaf blade; winter buds dark purple
      • 3b. Marginal flowers of inflorescence enlarged and neutral; leaves with slender stipules, the blades usually lacking teeth in the sinuses; petiole glands usually near apex of petiole but separated a short distance from the blade; winter buds red
  • 1b. Leaf blades not lobed [Figs. 313,315]
    • 4a. Winter buds naked [Fig. 312]; branchlets, winter buds, leaves, and inflorescence axes stellate-pubescent; drupes red (eventually turning very dark)
      • 5a. Marginal flowers of inflorescence not enlarged, fertile, similar in morphology to other flowers in the inflorescence; leaf blades 5–12 cm long; pubescence gray; stems erect
      • 5b. Marginal flowers of inflorescence enlarged and sterile; leaf blades 10–18 cm long; pubescence yellow-brown to red-brown; stems straggling or loosely ascending
    • 4b. Winter buds perulate; stellate hairs absent or present and then generally restricted 
to the leaves (abundant in V. plicatum, also on the winter buds in V. sieboldii); drupes dark blue to dark purple (red in V. dilatatum, at first pink in V. sieboldii)

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