Butterfly Weed or Orange Milkweed
Butterfly Weed or Orange Milkweed
Asclepias tuberosa
Milkweed Family or Asclepiadaceae
  Pathology Images Inc. 2002 2009
A 1 to 2 foot tall herb with a hairy stem and long (2 to 6 inches), narrow, entire, alternate leaves. Flowers small but bright orange with 5 petals bent backwards. Flowers in flat clusters about 2 inches in diameter. Juice of stems and leaves colorless unlike the white sap of other milkweeds. 
(Photographed at Fletcher Wildlife Garden, Ottawa; July 26, 2009)