Ulmus

Contains 5 accepted taxa overall.

Characteristics
Ulmus L.
ULMACEAE
ELM
View USF Herbarium specimens of this family
Classification
ROSALES
Ulmus
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.
Distribution Map Present

This species have been reported in the counties highlighted.

Species
Scientific Name Common Name Herbarium Specimens Status Photos
Ulmus alata WINGED ELM Native FACU (NWPL) FACW (DEP)
Ulmus americana AMERICAN ELM Native FAC (NWPL) T (WAP) FACW (DEP)
Ulmus crassifolia CEDAR ELM Native FAC (NWPL) FACW (DEP)
Ulmus parvifolia CHINESE ELM Not Native FACU (NWPL) FACW (DEP)
Ulmus rubra SLIPPERY ELM Native FAC (NWPL)
Identification Key
1.  Leaf blade mostly simply serrate; flowering late summer-fall
U. parvifolia
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
U. alata
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
U. crassifolia
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
U. americana
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
U. rubra
Genus Synonyms
Synonym Full Citation Basionym Type
Microptelea Microptelea Spach, Ann. Sci. Nat., Bot., ser. 2. 15: 358. 1841. TYPE: Microptelea parvifolia (Jacquin) Spach (Ulmus parvifolia Jacquin)