The Audubon Field Guide to North American Trees. 1992.
www.xs4all.nl/~kwanten/cultivars.htm
Maidenhair Tree
Ginkgo biloba L.
The leaves are in clusters of 3-5; 1-2 inches long;
fan shaped; slightly wavy on the broad edge; long leaf
stalk; can be 2 lobed. It has been cultivated into many
varieties. It is dioecious meaning the
male and female flowers are on
separate trees. The female tree has
seeds that smell like rancid butter. The
name Maidenhair refers to the fern that
the leaves resemble. The Ginkgo tree
is a native of China. It is resistant to
disease. It is believed to be 200 million
year old. The Ginkgo
tree was around during
the time of the
dinosaurs. It is used in
Chinese medicine to
improve brain and
respiratory function. It
is a strong antioxidant
and improves blood circulation.  It has helped people
with Parkinson's and Alzheimer's diseases.