This gourd is popular in Southern India and Southeast Asia. It comes in various colors, sizes and shapes, growing to as long as 6 feet, and in Asia is often seen with a rock tied to the tip to keep it growing straight. Shoots and leaves are also eaten as a vegetable.
The flesh of this gourd is similar to the Luffa and Bottle Gourd, and like them will hold its shape when cooked. Unlike the other two, the seed mass of the Snake Gourd is loose and fluffy. It is removed from all except the long 1 inch variety shown below. Snake gourd is also used in traditional Chinese medicine. Photo by Abhilash placed in public domain.
The Snake Gourd has a very strange flower that opens at night. In the photo the flower is still unfurling so it looks disorderly but it will open to 5 lacy petals. Photo by Tanakawho distributed under Creative Commons Attribution 2.0.
More on edible Gourds.
Here are some really snaky ones from a local Indian market in Los Angeles,
purchased in early 2010. The longest was 33-1/2 inches long, 1.1 inches
diameter and weighed 8 ounces.
Here's yet another variety from the same Indian market about 2 years earlier.
These were about 20 inches long, 2-1/4 inches diameter and weighed 1 pound
4 ounces. Green and white striped ones as shown in the heading photo are
also common here.