Based on analysis of references, network resource databases (including flora, specimen, and pictures), and also the field survey on all of the wild survival sites, the taxonomic status and morphological characteristics, places of origin and habitats, specimen records, research advances, and the endangered factors of the key national protected grade II plant Firmiana danxiaensis, were summarized in this paper, so as to providing scientific basis for its protection. There have been more than 30 years since the type specimen was collected in 1986 and named in 1987 first found in Danxia Mountain, Renhua County, Guangdong Province in China. According to the research, its areal range were enlarged from endemic to Danxia Mountain, Renhua County, to Quan’an Town and Gushi Town, Nanxiong City in 2014, and then to Yingcheng Town and Hengshitang Town, Yingde City in 2019. The habitats had enlarged from Danxia landform to limestone landform. All protection measures such as in situ and ex situ conservation, and more studies on this species should be combined for its effective protection.?
[1] 徐祥浩,丘华兴,徐颂军. 中国梧桐科植物的新种和新变种[J]. 华南农业大学学报, 1987,8(3): 1–5.
[2] Flora of China编委会.《中国植物志》英文修订版[EB/OL]. http:// foc.iplant.cn/content.aspx?TaxonId=242322642. [2019-09-14].
[3] 廖春花,张卿雄. 丹霞梧桐栖身南雄全安苍石寨[N]. 韶关日报, 2015-01-13, A01.
[4] 中国科学院植物研究所. 中国植物图像库[EB/OL]. http://ppbc.iplant.cn/sp/218752. [2019-09-14].
[5] 欧阳杰,彭华,罗晓莹,陈再雄,张安新,马育宣. 国家珍稀濒危保护植物丹霞梧桐空间分布的微地貌环境特征研究[J]. 地理科学, 2017,37(10): 1585–1592.
[6] 罗晓莹,陈秋慧,蔡纯榕,曾浩宁,任斌,郑万里,冯均尧. 极小种群植物丹霞梧桐群落的地理区系成分分析[J]. 韶关学院学报(自然科学版), 2015,36(12): 28–31.
[7] 陈璐,周宏,王敏求,武星彤,林雪莹,张原,文亚峰. 丹霞梧桐群落特征比较研究[J]. 中国野生植物资源, 2018,37(2): 46–49.
[8] 李远球,黄林生,缪绅裕,戴克元,曾阳金,陶文琴. 广东英德石灰岩地区植物多样性研究[J]. 亚热带植物科学, 2018,47(3): 235–240.
[9] 中国科学院植物研究所. 国家标本资源共享平台[EB/OL]. http://www.nsii.org.cn/2017/query.php?name=\u4e39\u971e\u68 a7\u6850. [2019-09-13]
[10] 徐颂军,徐祥浩. 梧桐科植物的地理分布[J]. 热带亚热带植物学报, 2001,9(1): 19–30.
[11] 徐颂军. 梧桐科植物在中国的地理分布[J]. 广西植物, 2002,22(6): 494–498.
[12] 谷立辉,周红菊. 丹霞梧桐首次人工孕育成功[N]. 南方日报, 2010-03-16. A10.
[13] Fan Q, Chen S F, Li M W, He S Y, Zhou R C, Liao W B. Development and characterization of microsatellite markers from the transcriptome of Firmiana danxiaensis (Malvaceae) [J]. Applications in Plant Sciences, 2013,1(12): 1300047.
[14] Chen S F, Li M W, Hou R F, Liao W B, Zhou R C. Low genetic diversity and weak population differentiation in Firmiana danxiaensis, a tree species endemic to Danxia landform in northern Guangdong, China[J]. Biochemical Systematics and Ecology, 2014,55: 66–72.
[15] Zhang Q M, Luo X Y, Chen Z X. Conservation and reintroduction of Firmiana danxiaensis, a rare tree species endemic to southern China[J]. ORYX, 2014,48(4): 485.
[16] Chen S F, Li M W, Jing H J, Zhou R C, Yang G L, Wu W, Fang Q, Liao W B. De novo transcriptome assembly in Firmiana danxiaensis, a tree species endemic to the Danxia landform[J]. PLoS One, 2015,10(10): e0139373.
[17] 武星彤,陈璐,王敏求,张原,林雪莹,李鑫玉,周宏,文亚峰. 丹霞梧桐群体遗传结构及其遗传分化[J]. 生物多样性, 2018,26(11): 1168–1179.
[18] 张薇,黄雅婷,钟平生,何向阳,陈红锋. 珍稀濒危植物丹霞梧桐种子萌发特性研究[J]. 林业与环境科学, 2018,34(6): 51–55.
[19] Liu C, Ai M C, Chen Z, Zhou Y, Wu H B. Detection of Firmiana danxiaensis canopies by a customized imaging system mounted on an UAV Platform[J/OL]. Hindawi Journal of Sensors, 2018, https://doi.org/10.1155/2018/6869807.
[20] 雷雨菁. 南雄丹霞梧桐自然保护区生态敏感性评价[D]. 长沙: 中南林业科技大学硕士学位论文, 2018.
[21] 胡纯. 南雄丹霞梧桐自然保护区植物多样性评价研究[D]. 长沙: 中南林业科技大学硕士学位论文, 2018.
[22] 陈璐. 丹霞梧桐EST-SSR标记位点开发及其群体遗传结构分析[D]. 长沙: 中南林业科技大学硕士学位论文, 2018.
[23] 武星彤,陈璐,王敏求,张原,李鑫玉,林雪莹,周宏,文亚峰. 基于丹霞梧桐转录组数据的EST-SSR标记开发[J/OL]. 植物遗传资源学报, 2019. https://doi.org/10.13430/j.cnki.jpgr.20190121001.
[24] Ouyang J, Luo X Y, Simoncon S L, Li G X, Chen Z X. Determining the number and distribution of Firmiana danxiaensis, a rare and endangered plant species in Danxiashan, South China, using DEM data and UAV technology[J/OL]. IOP Conf. Ser.: Earth and Environmental Science, 2019, 227: 052005. doi:10.1088/1755-1315/227/5/052005.
[25] 欧阳杰. 丹霞山国家重点保护野生植物丹霞梧桐生态保护红线研究[J]. 地理科学, 2019,39(7): 1166–1173.
[26] 汪松,解焱. 中国物种红色名录第1卷——红色名录[M]. 北京: 高等教育出版社, 2004: 360.
[27] 国家林业局. 中国重点保护野生植物资源调查[M]. 北京: 中国林业出版社, 2009: 165.
[28] 彭少麟,陈万成. 广东珍稀濒危植物[M]. 北京: 科学出版社, 2003: 44.
[29] 任海,张倩媚,王瑞江. 广东珍稀濒危植物的保护与研究[M]. 北京: 中国林业出版社, 2016: 31.
[30] 丘华兴. 华南植物区系的评论(二)Ⅱ.值得注意的锦葵科种类 Ⅲ.稀有的广东梧桐科植物[J]. 广西植物, 1994,14(4): 303–306.