Contains 6 accepted taxa overall.
Characteristics
The elms have been significantly impacted by the ascomycete Ophiostoma (Dutch elm disease) (Brasier & Buck 2001).
Classification
Citation
ULMUS Linnaeus, Sp. Pl. 225. 1753.
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TYPE: Ulmus campestris Linnaeus Lectotypified by Britton & A. Brown, Ill. Fl. N. U.S., ed. 2. 1: 626. 1913.
Species
| Scientific Name | Common Name | Herbarium Specimens | Status | Photos |
|---|---|---|---|---|
| Ulmus alata | Winged Elm | |||
| Ulmus americana var. americana | American Elm, White Elm | |||
| Ulmus americana var. floridana | Florida Elm | |||
| Ulmus parvifolia | Chinese Elm, Lacebark Elm | |||
| Ulmus pumila | Siberian Elm, Dwarf Elm | |||
| Ulmus rubra | Slippery Elm, Red Elm |
Identification Key
1. Leaf blade mostly simply serrate; flowering late summer-fall
1. Leaf blade mostly doubly serrate (the larger teeth with small teeth along the margin); flowering late summer-fall or winter-spring
2
2. Stems sometimes corky-winged; petiole 0-3 mm long; leaf blades obtuse to acute, subtly acuminate at the tip; flowering late summer-fall or winter-spring
3
2. Stems not corky-winged; petiole 3-10 mm long; leaf blades cuspidate-acuminate at the tip; flowering winter-spring
4
3. Leaf blades usually smooth on the upper surface, mostly acute to acute-acuminate at the tip; samaras long-ciliate, 6-8 mm long; pedicel 2-7 mm long; calyx lobes 5; flowering Jan-Apr, before leafing out
3. Leaf blades scabrous on the upper surface, mostly bluntly acute to obtuse at the tip; samaras ciliolate, 8-10 mm long; pedicel 7-10 mm long; calyx lobes 6-9; flowering Jul-Oct, among fully developed leaves
4. Young stems glabrous to pubescent; buds glabrous to shortly pubescent; leaf blades smooth to lightly scabrous on the upper surface; pedicel 10-20 mm long; samaras ovate, 10-13 mm long, ciliate on the margin
4. Young stems often densely pubescent; buds long-pubescent; leaf blades strongly scabrous on the upper surface; pedicel 1-2 mm long; samaras orbicular, 14-17 mm long, the margin not ciliate
Genus Synonyms
| Synonym | Full Citation | Basionym | Type |
|---|---|---|---|
| No synonyms found. | |||