Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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Dieter H. Wilken

Shrub or tree, often monoecious
Leaves simple, generally alternate, generally 2-ranked, short-petioled; stipules deciduous; blade base often oblique, veins pinnate
Inflorescence: cyme, clustered, axillary; flowers 1–few; bracts 0
Flower radial; sepals 4–6, free to fused; corolla 0; stamens 4–6, opposite sepals; ovary superior, chamber 1, ovule 1, style branches generally 2
Fruit: drupe or winged nutlet
Genera in family: ± 15 genera, ± 150 species: temp to tropical; some cultivated for ornamental (Celtis , Ulmus , Zelkova ), some used for wood, fibers (especially Ulmus )
Reference: [Elias 1970 J Arnold Arbor 51:18–40]
Recent taxonomic note: Celtis recently treated in Celtidaceae [Angiosperm Phylogeny Group 1998 Ann Missouri Bot Gard 85:531–553; Wiegrefe & Sytsma 1998 Plant Syst Evol 210:249–270]



Shrub or tree
Stem: trunk bark scaly to furrowed, gray to brown
Leaf serrate (or doubly so), base generally oblique, obtuse to cordate
Inflorescence sessile to short-stalked
Flower bisexual; calyx generally bell-shaped, lobes 5–9; stamens 5–9, exserted; style branches spreading
Fruit: nutlet, compressed, clearly winged
Species in genus: ± 20 species: n temp; some widely cultivated (e.g. U. americana , american elm, U. X hollandica , dutch elm).


U. pumila L.


Tree generally < 10 m
Stem: twigs glabrous to sparsely puberulent
Leaf: blade 3–9 cm, narrowly elliptic to lanceolate, margin generally singly serrate, glabrous (lower surface vein axils puberulent)
Inflorescence: flowers appearing before leaves in spring
Flower: calyx lobes short, unequal
Fruit 10–15 mm, 10–12 mm wide; body 2–4 mm wide; wing translucent, whitish
Ecology: Waste places, roadsides, washes
Elevation: < 1800 m.
Bioregional distribution: Sierra Nevada Foothills, Great Central Valley, East of Sierra Nevada, n Mojave Desert
Distribution outside California: to c US; native to c Asia
Flowering time: Spring
Cult; reproducing by seeds and root-sprouts.

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bioregional map for ULMUS%20pumila being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Ulmus pumila
Retrieve dichotomous key for Ulmus
Overlay Consortium of California Herbaria specimen data by county on this map
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