Jepson Flora Project: Jepson Interchange    

link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora.



Elizabeth McClintock

Shrub, tree, generally dioecious
Stem often thorny; bark often bitter
Leaves generally alternate, simple, entire, or pinnately compound with subentire leaflets
Inflorescence: panicle, raceme, or flowers solitary
Flower inconspicuous; sepals generally 5, generally fused at base, generally erect; petals generally 5, free, generally spreading; stamens generally 10–15, generally inserted on a disk, filaments often with a basal scale; pistils generally 2–5, ovaries superior, 1-ovuled (if pistil 1, chambers generally 2–5, 1-ovuled), styles free or partly fused
Fruit: winged achene, drupe, berry, or capsule
Genera in family: ± 25 genera, ± 150 species: tropical, warm temp; some cultivated
Reference: [Brizicky 1962 J Arnold Arbor 43:173–186]
Bark, leaves used in medicine.


Tree, unarmed, ± dioecious, with a few bisexual flowers
Leaves deciduous, generally ± odd-pinnate, ill-smelling when crushed
Inflorescence: large panicle, terminal
Flower: calyx lobes 5–6; petals 5–6; stamens 10–12; ovaries very compressed, adherent near middle, styles ± free but twisted around one another
Fruit: winged achene, 2–5 per flower, ± pendent
Species in genus: ± 15 species: eastern Asia, ne Australia
Etymology: (Moluccan: sky tree)


A. altissima (Mill.) Swingle


Plant < 20 m, rapidly growing; young parts ± glandular-puberulent
Leaf 3–9 dm; leaflets 13–25, 8–13 cm, lanceolate, base generally ± truncate, with 2–4 teeth, each with a large gland on lower surface
Inflorescence 10–20 cm
Fruit < 5 cm, linear or oblong, seed near middle
Ecology: Common. Disturbed urban areas, waste places
Elevation: < 1250 m.
Bioregional distribution: California Floristic Province
Distribution outside California: native to e Asia
Cult as street tree, spreading by seeds, invasive roots. Common near old Chinese habitations, especially SNF.

previous taxon | next taxon
bioregional map for AILANTHUS%20altissima 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 Ailanthus altissima
Retrieve dichotomous key for Ailanthus
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
Return to the Jepson Interchange main page
Return to treatment index page
  • This page is no longer being maintained.

University & Jepson Herbaria Home Page |
General Information | University Herbarium | Jepson Herbarium |
Visiting the Herbaria | On-line Resources | Research |
Education | Related Sites
Copyright © by the Regents of the University of California