This is a sport of H. 'Frances Williams' and it is similar to several other plants known as the H. 'Sieboldiana' yellow group. It is a large size hosta with yellow (lutescent) leaves and bell-shaped, near white flowers in clusters from late June into July. It is an American Hosta Society registrant  from 1984.

 

According to The Hostapedia by Mark Zilis (2009), "This is the much maligned gold-leaved sport out of 'Frances Williams' with the unfortunate habit of developing heavy amounts of spring desiccation burn. It has many great qualities (substance, flowers, large size), bit it can become so badly burned in spring, that it is not recommended  for general garden usage. For a similar appearance, but without the burn, try 'Abiqua Gold Shield', 'City Lights', 'Golden Waffles', 'Piedmont Gold', or 'Zounds'."

An article by Marvin C. Eisel, Hosta Registrar in The Hosta Journal (1985 Vol. 16) states that, "In the Fall 1984 The American Hosta Society Newsletter, page 12, I reported that I had registered in the name of The American Hosta Society, the cultivar name 'Golden Sunburst' for the golden forms of H. ' Frances Williams' and 'Golden Medallion' for all the golden mutations of H. tokudama."

Nomenclature changes recommended in the 1991 book The Genus Hosta by W. George Schmid and accepted by The American Hosta Society would update names as follows: H. tokudama is now H. 'Tokudama'.