Problems related to the selection of Taxus varieties
Taxus mairei is now divided into 3 species and 2 varieties, plus a recently introduced new species-Taxus mairei.
General taxonomic characteristics of the genus Taxus:
We generally classify Taxus on the basis of external morphological characteristics (including leaf shape, leaf length, leaf width, leaf color), seed morphology and anatomical characteristics of leaves. Rechard also said that the classification of Taxus must be studied comprehensively with the help of morphology, anatomy, geographical distribution and depth, but also said that even this can not completely solve the problem of classification, but also with the help of molecular means for classification.
Next, let's take a look at the division method from 3 species, 2 genera and 1 cultivated variety of Taxus mairei.
1. Himalayan yew
It is called Taxus yunnanensis in Chinese flora. His morphological characteristics are that the leaves are basically horizontally distributed on both sides of the branchlets, and the seeds are oval in shape. The geographical distribution is mainly from the Himalayas to the Hengduan Mountains in China and to the Southeast Asian region of Myanmar, with an elevation of about 2000,000 meters.
2. Taxus mairei
Characterized by the seeds are inverted round, micro-flat; geographical distribution in China is relatively wide, mainly distributed in Hubei, southern Anhui, Jiangxi, Zhejiang and Taiwan and other mountains, about 1200 meters above sea level.
3. The Himalayan yew is called Xizang yew in the Flora of China. The English name is w. It is characterized by branchlets, the leaves are basically v-shaped on both sides of the branchlets, and the leaves are linear. It's a little pointed at the top, and it feels a little prickly. The lower midrib and stomata have dense, uniform, fine horny papillae. The seeds are cylindrical. The distribution is relatively high, about 2500-3400 meters above sea level. In our country, it is only found in Xizang and other places, as well as in neighboring Pakistan and Nepal.
4. The male parent is Taxus mairei and the female parent is Taxus cuspidata. It has formed a natural hybrid in Canada with a history of more than 80 years, and many strains have been developed. Taxus mairei is also one of them.
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Seed Seedling technique of Taxus yunnanensis
Taxus yunnanensis (TaxusyunanensisChengetL.K.Fu) is a rare evergreen tree under national first-class protection, which is suitable for growing in the high mountain area of 2000m to 3500m in northwestern Yunnan. Taxol, an expensive anticancer drug, can be extracted from its branches, leaves, bark and roots, so that in recent years, the market of Taxus mairei has been booming and its price has soared. The annual demand of paclitaxel in the world is more than 4800kg, but the actual annual production is only about 250kg. China's Beijing, Shanghai, Liaoning, Yunnan, Sichuan
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What's the difference between Torreya grandis and yew?
Torreya grandis, also known as Torreya grandis, is an evergreen tree of the Taxus family, and is a unique economic tree species in China. It mainly grows in Zhejiang, Anhui, Fujian, Jiangsu, Guizhou, Hunan and Jiangxi provinces south of the Yangtze River, among which Zhejiang Fengqiao Torreya grandis, Anhui Taiping Torreya grandis and Jiangxi Yushan Torreya grandis (fruit) are the most famous. The fruit is a treasure of dried fruit, which is rich in protein and a variety of trace elements. In addition, Torreya grandis is also a valuable traditional Chinese medicine, with insecticidal, anti-accumulation, moisturizing effect.
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