For the July 2012 Monthly Challenge: Melodic Memories
and
for WEEKLY CHALLENGE 118: "Plants and Flowers"

Toxicodendron radicans, commonly known as poison ivy is a poisonous
North American plant that is well known for its production of urushiol,
a clear liquid compound found within the sap of the plant that causes
an itching, or sometimes painful rash in most people who touch it.
The plant is not a true ivy. Poison ivy grows throughout much of
North America, including the Canadian Maritime provinces, Quebec,
Ontario, Manitoba, and all U.S. states east of the Rockies, as well
as in the mountainous areas of Mexico up to around 1,500 m (4,900 ft),
and is normally found in wooded areas, especially along edge areas.
(Source: Wikipedia)

I happen to be quite allergic to poison ivy and learned early on...leaves of three, Let It Be!

"Let It Be" is a song by The Beatles, released in March 1970 as a single,
and (in an alternative mix) as the title track of their album Let It Be.
It was written by Paul McCartney, but credited to Lennon–McCartney.
It was their final single before McCartney announced his departure
from the band (by that time, Lennon had already left). (Source: Wikipedia)