Download 1 cm 1 cm 3 mm

petals ciliolate (tiny hairs)
(Order: Sapindales)
panicle
Margaret Fillius
bisexual+unisexual
Rhus integrifolia
Margaret Fillius
stamens 0 or 5
B
Toxicodendron diversiloba
Rhus integrifolia fruit
1 cm
Note longer
petiolule to
terminal leaf.
Petiolule
Terminal leaflet
Poison Oak:
resin in leaves,
stems, fruit can
cause severe
contact dermatitis.
Drupe sticky, spheroidal
5 petals
Lateral leaflets
Petiole
1 cm
© 2003 Michael Charters
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.
Rhus = Greek name for sumac
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.
Toxicodendron = poison tree
C
3 mm
pinnate venation
Terminology: Panicle Compound inflorescense 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. A
SGW
pistillate
© Br. Alfred Brousseau, Saint Mary's College
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.
small
drupe
© 2002 Margo Bors
D