This page is based on the 1993 Jepson Manual.
Please see the Jepson eFlora for up-to-date information about California vascular plants.
|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL||
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
Print edition is available from the University of California Press
|The second edition of The Jepson Manual (2012) is available from the University of California Press|
|See also the Jepson eFlora, which parallels the Second Edition|
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 1few; bracts 0
Flower radial; sepals 46, free to fused; corolla 0; stamens 46, 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 51:1840]
Recent taxonomic note: Celtis recently treated in Celtidaceae [Angiosperm Phylogeny Group 1998 Ann Missouri Bot Gard 85:531553; Wiegrefe & Sytsma 1998 Plant Syst Evol 210:249270]
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 59; stamens 59, 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).
Tree generally < 10 m
Stem: twigs glabrous to sparsely puberulent
Leaf: blade 39 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 1015 mm, 1012 mm wide; body 24 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.
|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).|