Türkçe karşılığının olmadığını ya da yerleşmediğini düşünüyorum. Japonlar bu bitkiye tatlıçay asması diyorlar, o halde bizim de bir şey yaratmamız uygun düşer.

Anavatanı olan Çin'de ölümsüzlük otu olarak anıldığına göre biz de Gılgamış destanındaki ota atfen ölümsüzlük otu olarak adlandırabiliriz.

Kaynaklar:

http://www.jiaogulan.net/Jiaogulan.htm
In Japan, jiaogulan is called amachazuru. 'Amacha' means 'sweet' in Japanese, referring to the sweet component prevalent in the plant, 'cha' means tea, and 'zuru' means 'vine'. The name perfectly describes the jiaogulan plant, which grows as a climbing vine and produces a sweet tea from its leaves.

http://www.herb.com/jgl.html
Jiaogulan (Gynostemma pentaphyllum), is a plant that grows wild in China, as well as many other countries throughout Asia. In China, it has been used for many years as a medicinal and energizing tea in the local regions where it grows. Jiaogulan is sometimes called "Southern Ginseng", since it grows in south central China and because of its similarity to ginseng in chemical composition and function. It is also praised as Xiancao, "Immortality" Herb, because it grows wild and has many health-giving qualities and anti-aging effects.

http://members.fortunecity.com/akademya6/makselgilgams.htm
Utnapiştim, Gılgamış'ın ısrarı üzerine, ona "ölümsüzlük otu"nun yerini tarif eder; "hayat otu", Tebu gölünün dibindedir.

http://www1.appstate.edu/~davisct/symbols/library/journey/gi...
The Dionysian serpent deprives Gilgamesh of the Herb of Immortality, a fact that reminds us that Dionysus is the god of the vine.

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Note added at 9 hrs 3 mins (2004-12-14 04:36:52 GMT)
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Yalnız ölmezotuyla karışmasın aman... :-)
http://www.belektourismcenter.org/eng/ekoloji/endemic_plants...