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Ulmus americana
AMERICAN ELM

Higher Taxonomy
Family: UlmaceaeView Description 

Common Name: ELM FAMILY
Habit: Tree. Leaf: simple, alternate, 2-ranked; veins pinnate; stipules deciduous. Flower: radial; sepals 4--9, free to fused; corolla 0; stamens 4--9, opposite sepals; ovary superior, chamber 1, ovule 1, style branches 2. Fruit: 2-winged nutlet.
Genera In Family: 7 genera, +- 60 species: temperate to tropics; some cultivated for ornamental (Ulmus, Zelkova), used for wood (especially Ulmus). Note: Celtis moved to Cannabaceae.
eFlora Treatment Author: Alan T. Whittemore
Scientific Editor: Bruce G. Baldwin.
Genus: UlmusView DescriptionDichotomous Key

Common Name: ELM
Habit: Deciduous. Leaf: serrate (or doubly so), base generally oblique, 2° veins straight, parallel, extending to margin, each ending in a tooth; axils of 2° veins generally with prominent tufts of hairs. Inflorescence: umbels or short racemes in leaf axils on old wood; flowers sessile or pedicels 7--17 mm. Flower: bisexual; calyx generally bell-shaped, lobes 4--9; stamens 4--9, exserted; ovary strongly compressed; style divided to base, branches spreading.
Species In Genus: +- 40 species: northern temperate. Note: Widely cultivated as street trees; flowers, fruit needed for identification.

Ulmus americana L.
WAIF
Habit: To 35 m; bark split into ridges that mostly curve together at their ends. Stem: corky outgrowths on branches 0; winter buds red-brown, conical or narrowly ovoid, +- pubescent. Leaf: 8.6--12.5 cm, 4.2--7 cm wide, elliptical or occasionally oblong, acuminate, generally slenderly so, margins strongly double-serrate, abaxial surface sparsely long-hairy on blade and veins, hairs tufted in vein axils. Inflorescence: flower, fruit before leaves in spring; pedicel 7--17 mm, slender. Fruit: 0.9--1.3 cm, 0.6--0.8 cm wide, elliptical or oblong, tan, margins densely ciliate, surfaces glabrous.
Ecology: Seeding along disturbed streambanks, or spreading by root suckers near old plantings; Elevation: 60--700 m. Bioregional Distribution: ScV, SCo; Distribution Outside California: native to eastern United States. Flowering Time: Feb--Mar
eFlora Treatment Author: Alan T. Whittemore
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Citation for this treatment: Alan T. Whittemore 2016. Ulmus americana, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=47473, accessed on August 26, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on August 26, 2016.


Ulmus americana
click for enlargement
© 2016 Keir Morse
Ulmus americana
click for enlargement
© 2016 Keir Morse
Ulmus americana
click for enlargement
© 2016 Keir Morse
Ulmus americana
click for enlargement
© 2016 Keir Morse
Ulmus americana
click for enlargement
© 2016 Keir Morse
Ulmus americana
click for enlargement
© 2016 Keir Morse

More photos of Ulmus americana in CalPhotos


Geographic subdivisions for Ulmus americana:
ScV, SCo;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.