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Vascular Plants of California
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Toxicodendron diversilobum

Higher Taxonomy
Family: AnacardiaceaeView DescriptionDichotomous Key
Habit: Shrub, tree; generally dioecious or flowers bisexual and unisexual; resin clear, often weathering black, generally aromatic, latex milky or 0. Leaf: simple to ternate- or odd-pinnate-compound, alternate, deciduous or evergreen; stipules 0. Inflorescence: raceme or panicle; flowers generally many. Flower: generally unisexual, radial; sepals generally 5, base generally +- fused; petals 5, generally > sepals, free; (perianth parts 1--7 in Pistacia); stamens 4--7 or 10, vestigial in pistillate flowers; ovary superior, vestigial or 0 in staminate flowers, subtended by +- lobed, disk-like nectary, chamber generally 1, ovule generally 1, styles 1--3. Fruit: drupe, generally +- flat, sticky or not, hairs short or 0; pulp +- resinous, aromatic or not.
Genera In Family: 70+ genera, +- 850 species: tropics, warm temperate; some ornamental (Rhus, Schinus), cultivated for fruit (Anacardium, cashew; Mangifera, mango; Pistacia, pistachio). Toxicity: TOXIC: many genera produce contact dermatitis.
eFlora Treatment Author: John M. Miller & Dieter H. Wilken, except as noted
Scientific Editor: Bruce G. Baldwin, Thomas J. Rosatti.
Genus: ToxicodendronView Description 

Habit: Shrub, vine-like or not; generally dioecious. Leaf: +- resinous; leaflets 3--9, thin to +- leathery, entire, toothed, or lobed. Inflorescence: raceme or panicle, axillary, +- open; flowers pedicelled. Flower: stamens 5, vestigial in pistillate flowers; styles +- fused, stigmas 3. Fruit: generally spheric, papery or leathery in age, cream to brown; pulp resinous.
Species In Genus: 15 species: America, eastern Asia. Etymology: (Latin: poisonous tree) Toxicity: TOXIC: resin on leaves, stems, fruits causes severe contact dermatitis; one of the most hazardous plants in California.
Unabridged Reference: Yiet al. 2007 Syst Bot 32:379--391; Pell 2004 Ph.D. Dissertation, Louisiana State Univ, Baton Rouge; Cronquist et al. 1997 Anacardiaceae In: Intermountain Flora 3A: 313--317; Wannan & Quinn 1991 Bot J Linn Soc 107:349--385; Wannan & Quinn 1990 Bot J Linn Soc 103:225--252; Ibe & Leis 1979 Bull Torrey Bot Club 106:140--144; Gillis 1971 Rhodora 73:72--159, 161--237, 370--443, 465--540
Toxicodendron diversilobum (Torr. & A. Gray) Greene
Habit: Shrub, 0.5--4 m, or vine-like, < 25 m. Stem: twigs gray- to red-brown, tapered, hairs 0 to sparse. Leaf: petiole 1--10 cm; leaflets 3(5), +- round to oblong, entire, wavy, or +- lobed, thin to +- leathery, bright red in fall, adaxially glabrous, shiny, abaxially sparse-short-hairy, base truncate to rounded, tip obtuse to rounded; terminal leaflet 1--13 cm, 1--8 cm wide, lateral 1--7 cm, 1--6 cm wide. Inflorescence: branches loose, generally arched, slender; pedicels 2--8 mm; bractlets < 1 mm. Flower: sepals green; petals > sepals, generally ovate, yellow- to white-green. Fruit: 1.5--6 mm diam, spheric to +- compressed, glabrous to fine-bristly, creamy white, in age leathery; pulp white, black-striate. Chromosomes: 2n=30.
Ecology: Canyons, slopes, chaparral, coastal scrub, oak woodland; Elevation: < 2000 m. Bioregional Distribution: CA-FP; Distribution Outside California: to British Columbia, western Nevada, northern Baja California. Flowering Time: Apr--Jun
Synonyms: Rhus diversiloba Torr. & A. Gray
Unabridged Note: A related sp., Toxicodendron rydbergii (Small ex Rydb.) Greene, occurs in southeastern Oregon, Nevada, Utah, western Arizona.
Jepson eFlora Author: John M. Miller & Dieter H. Wilken
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Botanical illustration including Toxicodendron diversilobum

botanical illustration including Toxicodendron diversilobum


Citation for this treatment: John M. Miller & Dieter H. Wilken 2012, Toxicodendron diversilobum, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 07, 2021.

Citation for the whole project: Jepson Flora Project (eds.) 2021, Jepson eFlora,, accessed on May 07, 2021.

Toxicodendron diversilobum
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© 2014 Keir Morse
Toxicodendron diversilobum
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© 2008 Thomas Stoughton
Toxicodendron diversilobum
click for enlargement
© 2014 Keir Morse
Toxicodendron diversilobum
click for enlargement
© 2004 George W. Hartwell
Toxicodendron diversilobum
click for enlargement
© 2010 Thomas Stoughton
Toxicodendron diversilobum
click for enlargement
© 2008 Keir Morse

More photos of Toxicodendron diversilobum in CalPhotos

Geographic subdivisions for Toxicodendron diversilobum:
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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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All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).