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| 苦苣苔科石山苣苔属一新种——重庆石山苣苔 |
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苏兰英1,2, 彭 涛3, 赵志国2, 盘 波2,4, 温 放2,4*
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1. 珍稀濒危植物生态与环境保护教育部重点实验室, 广西师范大学, 广西 桂林541006;2. 广西喀斯特植物保育与恢复
生态学重点实验室, 广西壮族自治区
中国科学院 广西植物研究所, 广西 桂林 541006;3. 贵州师范大学 生命科学学院,
贵阳550025;4. 中国苦苣苔科植物保育中心, 中国科学院桂林植物园, 广西 桂林541006
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| 摘要: |
| 该文报道了产自我国重庆市苦苣苔科植物一新种——重庆石山苣苔(Petrocodon chongqingensis F. Wen, B. Pan & L.Y. Su)。此新种(重庆石山苣苔)在形态上与其近缘种(湖南石山苣苔)(P. hunanensis X. L. Yu & Ming Li)相似,二者的区别在于此新种无明显延长的根状茎、叶柄密被白色长柔毛,叶片两面均密被长柔毛和短柔毛、苞片互生,线形至披针形,1.3～1.5 × ca 0.4 mm、花冠紫红色至紫色,长3～5 cm、子房长约2 cm,无柄。根据IUCN物种红色保护名录濒危等级的评定标准,此新种的保护等级被暂定为易危Vulnerable(VU)。对此新种的种子和花粉及其近缘种(湖南石山苣苔)的种子微观形态进行了扫描电镜观察。结果表明:二者种子均为瘦长形,此新种的种子表面具圆形、长圆形或不规则小穴状纹饰和不规则突起,穴内有次级微突起而其近缘种种子表面纹饰呈网状结构,网格为方形、长方形或少数规则形,网格内具次级不规则形突起。此新种的花粉为长球形,极面观为近圆形,赤道观为椭圆形,细网状纹饰,网脊上具有小颗粒状突起。 |
| 关键词: 花粉形态, 湖南石山苣苔, 喀斯特植物, 苦苣苔亚科, 新分类群, 种子形态 |
| DOI：10.11931/guihaia.gxzw201903010 |
| 分类号:Q949.9 |
| 文章编号:1000-3142(2019)08-0997-10 |
| Fund project:国家自然科学基金(31860047); 广西自然科学基金(2017GXNSFAA198006); 广西喀斯特地区植物保护与恢复生态重点实验室基金(17-259-23); 广西科学院科学研究基金(2017YJJ23022); 桂林市科学研究与技术开发计划项目(20170107-2, 20180107-6)[Supported by the National Natural Science Foundation of China(31860047); Guangxi Natural Science Foundation Program(2017GXNSFAA198006); Fund of Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain(17-259-23); Science Research Foundation of Guangxi Academy of Sciences(2017YJJ23022); Guilin Scientific Research and Technology Development Program(20170107-2, 20180107-6)]。 |
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| Petrocodon chongqingensis, a new species of Gesneriaceae from Chongqing City, China |
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SU Lanying1,2, PENG Tao3, ZHAO Zhiguo2, PAN Bo2,4, WEN Fang2,4*
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1. Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Ministry of Education, Guangxi Normal University,
Guilin 541006, Guangxi, China;2. Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of
Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, Guangxi, China;3. School of Life Sciences,
Guizhou Normal University, Guiyang 550025, China;4. Gesneriad Conservation Center of China
(GCCC), Guilin Botanical Garden, CAS, Guilin 541006, Guangxi, China
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| Abstract: |
| Petrocodon chongqingensis(Gesneriaceae), a new species from Chongqing City, China, is described and illustrated here. This new species morphologically resembles P. hunanensis, and different from the latter in lacking elongated rhizome, petioles densely white villous, both surfaces of leaf blades densely villous and pubescent, bracts alternate, linear to linear-lanceolate, 1.3-1.5 × ca. 0.4 mm, corolla fuchsia to reddish purple, 3-5 cm long, ovary ca. 2 cm long and no stipitate. The conservation status of P. chongqingensis is provisionally assessed as “Vulnerable”(VU)according to IUCN Red List categories. The micromorphological characteristics of seed and pollen grain of the new species and seed of its congener were observed by using scanning electron microscope(SEM). Seed shape of the new species and its congener are narrowly oblong, exine ornamentation of P. chongqingensis has rounded, oblong or irregular cave and irregular protrusions, caves also with irregular protrusions. Exine ornamentation of P. hunanensis is reticulate, lumina is rectangular square or irregular, lumina with irregular protrusions. The pollen grain shape of P. chongqingensis is prolate, circular in polar view and oblong in equatorial view, exine ornamentation is microreticulate to perforate, ridge of reticulum with granulate protrusions. |
| Key words: pollen morphology, Petrocodon hunanensis, limestone flora, Didymocarpoideae, new taxon, seed morphology |
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