Authoritative English literature should be found on SCI and NCBI, but the literature here is charged. If you can't find the literature you want, you can send an email to the science museum and library in your city, and it will usually be sent to you. This is also the method I use more. If you can't download it, you can send me the English keywords of botany, or I'll help you find the author and email address you want, because I use the SCI and NCBI databases bought by the school. But I may not check it for you right away, which means the experiment is a little busy ~ ~