(Order: Sapindales) Family: Anacardiaceae -- Sumac, Cashew Selected Family Traits: Habit: Shrubs, dioecious or bisexual+unisexual Leaves: Alternate, simple, compound, entire to serrate, pinnate venation, no stipules Infloresence: Raceme or panicle Flowers: Small radial, superior ovary, stamens 5 -10 reduced or sterile in pistillate flowers Calyx: 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 many genera. 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, vines Lvs. ternate, odd-pinnately compound Infl. raceme or panicle; Fls. small, stamens 5 sterile or reduced in pistillate flowers Calyx 5 sepals Corolla 5 petals Fruit small drupe. Drupe sticky, spheroidal SGW Rhus integrifolia fruit B pinnate venation Margaret Fillius Margaret Fillius petals ciliolate (tiny hairs) Rhus integrifolia bisexual+unisexual panicle pistillate D Toxicodendron diversiloba © Br. Alfred Brousseau, Saint Mary's College Terminal leaflet Lateral leaflets Petiole Petiolule Note longer petiolule to terminal leaf. Poison Oak: resin in leaves, stems, fruit can cause severe contact derma- titis. © 2002 Margo Bors © 2003 Michael Charters 1 cm 1 cm 1 cm 1 cm 3 mm 3 mm Rhus = Greek name for sumac Toxicodendron = poison tree Rhus (genus traits): Shrubs or small trees, dioecious or bisexual+pistillate Lvs. alternate, simple or compound, stipules 0 Infl. raceme or panicle Fls. small, stamens 0 or 5, styles 3 Calyx 4-6 sepals Corolla mostly 5 petals Fruit 3 lobed capsules. stamens 0 or 5 small drupe 5 petals