A new species of Bredia (Sonerileae, Melastomataceae) from Sichuan, China
A new species of Bredia (Sonerileae, Melastomataceae) from Sichuan, China
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中国四川Bredia (Sonerileae, Melastomataceae)一新种
DOI：
10.3897/phytokeys.152.53512
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发表时间：
2020-07-03
期刊：
影响因子：
1.4
通讯作者：
Liu, Ying
中科院分区：
文献类型：
--
作者：
Dai, Jin-Hong;Zhou, Qiu-Jie;Liu, Ying
摘要根据形态学和分子生物学资料，对川东南产的一种短梗野牡丹（Bredia hispida）进行了新描述。B的一般位置。hispida的系统发育分析和形态学特征都很好地支持了这一观点，包括基部心形，叶片有毛，聚伞状花序，基部囊状花药和扩大的子房冠内有一个倒截头锥状凹陷。分子和形态的差异表明，B。硬毛目与它的近亲有很好的分离，证明它是一个独特的物种。新物种类似于B。repens，B. changii和B. Guidongensis在匍匐习性和雄蕊同形方面存在显著差异，但在叶片对生不相等、叶片正面刚毛粗长2-4 mm、叶尖渐尖等方面存在显著差异。Bredia hispida与B共存。野生的爱斯基摩人尽管它们在花期重叠，但没有观察到它们之间的形态学上推定的杂种。隔离机制尚不清楚，有待进一步调查。
Abstract Bredia hispida (Sonerileae, Melastomataceae), a species occurring in southeastern Sichuan, China, is newly described based on morphological and molecular data. The generic placement of B. hispida is well supported by phylogenetic analysis and morphological characters, including basally cordate, hairy leaf blade, cymose inflorescence, basally gibbous anthers and enlarged ovary crown enclosing an inverted frustum-shaped depression. Both molecular and morphological divergence showed that B. hispida is well separated from its close relatives, justifying its recognition as a distinct species. The new species resembles B. repens, B. changii and B. guidongensis in the prostrate habit and isomorphic stamens but differs markedly in the unequal opposed leaves, the 2–4 mm long, stout bristles on the adaxial surface of leaf blade and acuminate leaf apex. Bredia hispida co-occurs with B. esquirolii in the wild. No morphologically putative hybrids between them were observed despite their overlap in flowering season. The isolating mechanism remains unclear, pending further investigation.