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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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

ANACARDIACEAE

SUMAC or CASHEW FAMILY

Dieter H. Wilken

Shrub, tree, generally dioecious or flowers bisexual and unisexual, ± resinous, sometimes milky, generally aromatic
Leaves simple or compound, alternate, deciduous or evergreen; stipules 0
Inflorescence: raceme or panicle; flowers generally many
Flower generally unisexual, radial; sepals 5, base generally ± fused; petals 5, generally > sepals, free; stamens 5 or 10, reduced and sterile 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-like, glabrous, sticky, or short-hairy; pulp ± resinous, sometimes aromatic
Genera in family: 70+ genera, ± 850 species: tropical, warm temp; some ornamental (Rhus, Schinus ), some cultivated for fruit (Anacardium , cashew; Mangifera , mango)
Reference: [Brizicky 1962 J Arnold Arbor 43:359–375]
TOXIC: many genera produce contact dermatitis.

TOXICODENDRON

POISON OAK, POISON IVY

Shrub, tree, vine, generally dioecious
Leaves generally ternate or pinnately compound, ± resinous; leaflets 3–9, lateral generally opposite, thin to ± leathery, entire, toothed, or lobed
Inflorescence: raceme or panicle, axillary, ± open; flowers pedicelled
Flower: stamens 5, sterile or reduced in pistillate flowers; styles ± fused, stigmas 3
Fruit generally spheric, becoming papery or leathery, cream to brown; pulp resinous
Species in genus: 6 species: Am, eastern Asia
Etymology: (Latin: poisonous tree)
Reference: [Gillis 1971 Rhodora 73:161–237,370–443]
TOXIC: resin on leaves, stems, fruits causes severe contact dermatitis; one of the most hazardous plants in CA.

Native

T. diversilobum (Torr. & A. Gray) Greene

WESTERN POISON OAK

Shrub (sometimes tree-like) 0.5–4 m or vine < 25 m
Stem: twigs glabrous to sparsely hairy, gray- to red-brown
Leaf: petiole 1–10 cm; leaflets generally 3(5), ± round to oblong, thin to ± leathery, becoming bright red in autumn, base truncate to rounded, tip obtuse to rounded, margin entire, wavy, or slightly lobed, upper surface glabrous, ± shiny, lower sparsely short-hairy; terminal leaflet 1–13 cm, 1–8 cm wide; lateral leaflets 1–7 cm, 1–6 cm wide
Inflorescence drooping, spreading, or erect; pedicels 2–8 mm; bractlets < 1 mm
Flower: sepals, petals generally ovate, yellow-green
Fruit 1.5–6 mm diam, spheric to slightly compressed, becoming leathery, glabrous to finely bristly, creamy white; pulp white, black-striate
Chromosomes: 2n=30
Ecology: Canyons, slopes, chaparral, oak woodland
Elevation: < 1650 m.
Bioregional distribution: California Floristic Province, sw edge Mojave Desert
Distribution outside California: to British Columbia, Baja California
Flowering time: Apr–May
Synonyms: Rhus d. Torr. & A. Gray

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bioregional map for TOXICODENDRON%20diversilobum being generated
 
N.B. The distribution depicted here differs from that given in The Jepson Manual (1993)

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