1. Tangdi táng di is the name of the flower. The flowers are yellow and bloom in late spring. Tangtang flowers are yellow and should be distinguished from Ditang flowers. They are actually two kinds of flowers. It is also the name of the tree. See Dong Zhongshu's "Spring and Autumn Dew·Bamboo Forest": ""Poetry" says: The flowers of Tangdi are turned against each other. Don't you think that the room is far away."
2. The ancient poem "Tang Di" is a poem in which Zhou people sing about the love between brothers when they have a banquet with brothers. "Everyone today is better than a brother", is the main theme of one article. However, the poem's elucidation of this theme is multi-layered: it includes singing about "nothing better than brothers"; there is also a lament about "not as good as friends"; and there is also admiration and expectation for "harmony and perfection".
"Tang Di Shu" says that Tang Di "its flowers are either white or red, ripe in mid-June, as big as plums, and edible." Li Shangyin's poem "Send to Luo Shaoxing" says: "Tangdi has yellow flowers and hair, and forgets to worry about the green leaves." It must be that Tangdi must have a variety of yellow flowers. It shouldn't be the same species.
So, there are two varieties of Ditang with yellow and white flowers. Are the flowers of Ditang the same as Ditang? Furthermore, we know that Ditang is Di, but what is Di?
"Shantang Si Kao" is a natural history compiled by Peng Dayi, a folk scholar in Tongzhou during the Wanli period. In Volume 200, there is this passage:
Xinyi Flowers with Ditang Flowers
General Commentary on the Study of Things: Xinyi flowers are several feet tall, with leaves like persimmons, and they are just beginning to grow. Like a pen. It blooms in the first two months of the year and drops without seeds. It blooms again in summer and autumn and is small with red purple bracts. It is called a wooden pen and a Hou peach. This is what the Li Sao Sutra calls Xin Yi. Ditang, that is, Tangtang, the tree is like a poplar. It has been passed down from generation to generation that the flowers are blooming, but they are blooming later. "Shi Xiaoya" "The flowers of Tang Di are not blooming", and the Yi poem "The flowers of Tang Di are blooming but they are blooming instead", which is the fragrance of fragrance.
As for the trees that look like poplars, most of the rose family are shrubs, and none of the tree trunks can grow as straight as poplars, so they must be mistaken for poplar trees.
Going back to the poem, we can find that Tangdi has two characteristics: first, "E is not Wei Wei", the calyx and pedicle are bright and bright; second, they can be compared to brothers. There are two more sayings here. One is that flowers (or fruits?) are dependent on each other, and the other is that calyx and flower embryo are dependent on each other. But if it is the latter, it seems that it cannot be regarded as a distinctive feature. Furthermore, "The Complete Collection of Jialing Ci" contains the sentence "Zengtangdi is the most important thing." The flowers of Tangdi should indeed depend on each other. Hawthorn has been nicknamed "Tangqiuzi", and the flowers grow quite close together, so it is reasonable to guess that it is Tangdi.
To summarize, Tangdi should:
The flowers or fruits are white
The flowers (or fruits?) are dependent on each other, and the flowers bloom first and then close
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Neither Tang Di, nor very Di (Yu Li), but similar to Tang Di
According to this speculation, Tang Di's real body should be Bai Ditang, also known as Ji Ma. The ancients did not know the species, so it was reasonable to think that Bai Ditang was a type of Ditang.