How the collision happens
The pattern is consistent. A distinctive plant is found or bred; a tea made from it becomes locally famous; the tea’s name is the plant’s name because at first there was nothing to distinguish. Then demand outgrows the plant. The plant may be low-yielding, difficult, or confined to a small area, while the manufacturing method transfers easily — so producers make the same style from easier cultivars, and the name follows the style rather than the plant. Within a generation the name means a way of making tea, and the original plant is a specialist claim within it. Nothing dishonest is required at any stage. Each step is a reasonable commercial decision, and the result is a vocabulary in which a single word denotes a plant to a nurseryman, a process to a factory and a category to a shop. The confusion is structural rather than deceptive, which is why it survives so well: nobody involved has an interest in resolving it, and each party is using the word correctly in their own domain.
Tie Guan Yin, the clearest case
Tie Guan Yin is a genuine Anxi cultivar with a thick folded leaf and a pronounced orchid aroma. It is also low-yielding, disease-prone and awkward, and a great deal of tea sold under the name is made from easier Anxi cultivars — Ben Shan, Mao Xie, Huang Dan and the more recent Guan Yin crosses — in the Tie Guan Yin manner. The case is sharpened by Taiwan, where Muzha-style Tie Guan Yin is made in the hills south of Taipei from Ying Zhi Hong Xin, a completely different plant, and is not attempting to be the Anxi cultivar at all. A drinker holding a tin marked Tie Guan Yin therefore has, at minimum, three possibilities: the Anxi cultivar made in its own style, an Anxi substitute cultivar made in that style, or a Taiwanese tea made in a related style from unrelated material. All three are legitimate products. Only one of them is the plant, and no label convention exists to say which you have.
Da Hong Pao, where the name has three referents
TeaHQ's own reading of well-attested general knowledge, with no single source behind it.
Da Hong Pao is the name of a small number of famous old bushes in the Wuyi mountains, no longer harvested; of the clonal descendants propagated from them, with Qi Dan usually identified as the line; and — in overwhelming volume — of a blended commercial style of roasted Wuyi rock oolong assembled to a house recipe from several cultivars. The third is the normal product and is not a fraud: blending is the traditional Wuyi approach, and a well-made blended Da Hong Pao is what most people who like the tea actually like. What is misleading is the marketing that attaches the first meaning to the third, and this is where the mother-bush narrative does its work. Any tea sold with a story about the original bushes is making a claim that cannot be true of a commercial quantity, since those plants have not been harvested commercially for a long time and never produced much. The story is a style of selling, not a description of contents.
Shui Xian, Rou Gui and the mountain that is not named
Shui Xian is a Fujian cultivar and a Wuyi rock tea; it is also, as Fenghuang Shui Xian, the base population of the entirely separate Phoenix Dan Cong tradition in Guangdong, several hundred kilometres away. Rou Gui is a Wuyi cultivar known for a cassia-like aroma, and Rou Gui Xiang is one of the aroma classifications of Phoenix Dan Cong — same spice reference, different provinces, different plants, different teas. Zhangping Shui Xian, pressed into small squares, is a third use of the name again. The practical rule is that a name of this kind is incomplete without a mountain. Shui Xian from Wuyi and Shui Xian from Fenghuang are not variants of one tea and a seller who lists neither has not told you what they are selling. The same applies to Rou Gui, and to any Dan Cong aroma name, since the aroma names belong to a Chaozhou classification system and mean something different anywhere else.
Jin Xuan, and a name that travelled
TeaHQ's own reading of well-attested general knowledge, with no single source behind it.
Jin Xuan is Taiwan’s Taicha No. 12, a bred cultivar with a naturally creamy note, and it is one of the very few plants whose name reached consumers as a selling point. It has also been planted extensively outside Taiwan — in Thailand and Vietnam in particular — so a Jin Xuan is now a cultivar claim rather than an origin claim, and a cheap one is quite likely not Taiwanese. Alongside it sits milk oolong, which is a marketing term rather than either a plant or a place, and which is applied both to genuine Jin Xuan and to teas that have been flavoured. The related trap is Ruan Zhi, which in Thai usage designates a Taiwanese numbered cultivar and in Taiwanese usage is a name for Qing Xin Oolong. A word that names one plant in one country and another in the next is not a rare failure in this vocabulary; it is normal, and it is why a cultivar catalogue has to record aliases rather than assume names are unique.
What to ask, and what an honest answer sounds like
Three questions separate most of these cases. Which mountain or county — because a shared name almost always resolves once a place is attached. Which cultivar, if the seller knows, and are they willing to say they do not. And is this a single-cultivar tea or a blend, since for Wuyi rock teas and for most famous names the honest answer is frequently blend. A good vendor answers all three without difficulty and a poor one produces the origin story instead. It is worth being clear that no answer to these questions can be verified by the buyer. Nothing in a finished leaf identifies its cultivar, and a cultivar claim is an assertion of good faith rather than a certification. What the questions test is whether the seller knows their own supply chain, and that turns out to correlate with a great deal else.