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Viburnum dentatum var. scabrellum Torr. & A. Gray  
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Family: Adoxaceae
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The Morton Arboretum
Shrub 1 - 5 m tall Leaves: opposite, stalked, shiny green above, dull green beneath, 4 - 10 cm long, mostly rounded with a heart-shaped base (sometimes) and pointed to rounded tip, sharp-toothed, thick, bearing many star-shaped hairs on the lower surface, veins strongly raised. Leaf stalks 8 mm - 2.5 cm long, with star-shaped hairs. Flowers: in branched, compound clusters (cymes), which are borne terminally on the stems. Cymes mostly five- to seven-rayed, flat-topped, to about 13 cm wide. The leaves subtending the cymes have leaf stalks over 7 mm long. Corolla five-lobed, white, 4 - 5 mm wide, bell-shaped, sometimes sparsely hairy internally. Corolla tube to 1.2 mm long, 2 - 3 mm wide. Stamens five, exserted from the corolla. Anthers yellow. Stigma three-lobed. Fruit: berry-like (drupe), in clusters, bluish black, 5 - 10 mm wide, spherical, single-seeded. Twigs: slender, angled, downy when young, becoming hairless with age. Form: rounded with arching branches.

Similar species: Two other varieties of Viburnum dentatumoccur in the Chicago Region: dentatum and lucidum. Variety dentatum differs by having egg-shaped, thin, and nearly hairless leaves. Variety lucidum differs by having nearly hairless leaves and hairless leaf stalks. Viburnum rafinesquianum is also similar but has stipules on the leaf stalks. Also, the leaves subtending the inflorescence of V. rafinesquianum have leaf stalks no longer than 7 mm.

Flowering: May to June

Habitat and ecology: Introduced from farther east. Our only Chicago Region record is from Cook County, Illinois. The plant was found growing in a woodland edge, and was probably an escape from cultivation.

Occurence in the Chicago region: non-native

Notes: About 200 species of Viburnum occur between North America, Europe and Asia. Many are ornamental shrubs cultivated for their showy flowers, autumn foliage, and attraction to wildlife.

Etymology: Viburnum is the Latin word for the Wayfaring tree. Dentatum means toothed.

Author: The Morton Arboretum

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Viburnum dentatum var. scabrellum
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