(Order: Sapindales) Family: Anacardiaceae -- Sumac, CashewSelected Family Traits: Habit: Shrubs, dioecious or bisexual+unisexualLeaves: Alternate, simple, compound, entire to serrate, pinnate venation, no stipulesInfloresence: Raceme or panicleFlowers: Small radial, superior ovary, stamens5 -10 reduced or sterile in pistillate flowersCalyx: 5 sepals common, united at base, disk-like nectary Corolla: 5 petals common, petals free Fruit: Drupe sticky, spheroidal, glabrous Genera: Anacardium, Malosma, Mangifera, Pistacia, Rhus, Schinus, Toxicodendron.TOXIC: Contact dermatitis caused by manygenera.

A

Terminology: Panicle Compound inflores-cense with younger flowers at the apex. Pistillate A flower with stamens sterile or degenerate. Drupe Fleshy frt. 1 seed Petiole, petiolule Stalk to leaf, leaflet rsp.

C

Toxicodendron (genus traits): Shrubs, vinesLvs. ternate, odd-pinnately compound Infl. raceme or panicle; Fls. small, stamens 5 sterileor reduced in pistillate flowers Calyx 5 sepals Corolla 5 petals Fruit small drupe.

Drupe sticky, spheroidalSGW

Rhus integrifolia fruit

B

pinnate venation

Margaret Fillius

Margaret Fillius

petals ciliolate (tiny hairs)

Rhus integrifolia

bisexual+unisexual

paniclepistillate

D

Toxicodendron diversiloba

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Bro

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au, S

aint

Mar

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Col

lege

Terminal leaflet

Lateral leaflets

Petiole

PetioluleNote longerpetiolule toterminal leaf.

Poison Oak: resin in leaves,stems, fruit cancause severe contact derma-titis.

© 2002 Margo Bors© 2

003

Mic

hae

l Ch

arte

rs

1 cm1 cm

1 cm1 cm

3 mm3 mm

Rhus = Greek name for sumac

Toxicodendron = poison tree

Rhus (genus traits): Shrubs or small trees, dioeciousor bisexual+pistillate Lvs. alternate, simple or compound, stipules 0 Infl. raceme or panicle Fls. small, stamens 0 or 5, styles 3 Calyx 4-6 sepalsCorolla mostly 5 petals Fruit 3 lobed capsules.

stamens 0 or 5

smalldrupe

5 petals