Flower size variation in Danhatchia (Orchidaceae)

IF 0.5 4区生物学 Q4 PLANT SCIENCES Telopea Pub Date : 2020-09-29 DOI:10.7751/TELOPEA14437

M. Renner

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Abstract

Danhatchia novaehollandiae D.L.Jones & M.A.Clem. and D. australis (Hatch) Garay & Christenson were separated at species rank due to differences in petal length and flower opening, with the Australian species having smaller, tardily opening flowers. From this, flower lengths for Australia and New Zealand are expected to be bi-modally distributed with peaks at c. 3 mm and c. 5 mm respectively. Flowers on all available herbarium specimens in AK, CANB, and NSW were measured, and flower length was found to be unimodal, with nearly identical ranges in Australian and New Zealand plants. Flower size variation in Australian and New Zealand Danhatchia specimens has two significant contributing components, inter-individual variation, and ontogenetic variation where flowers increase in size as they age. Dimensions previously recorded for the two species reflect upper and lower limits on the range of variation in flower size present in both New Zealand and Australia, respectively. Within herbarium material, 20% of flowers on New Zealand specimens, and 40% of flowers on Australian specimens exhibited signs of opening. There was no correlation between flower size and opening, as might be expected if the two species were both present in Australia and/or New Zealand. Neither the biogeographic context, pollination system, nor morphological evidence support Danhatchia australis and D. novaehollandiae as distinct species.

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兰科丹霞花的大小变异

新荷兰丹哈奇亚，d.l.琼斯和M.A.Clem。和D. australis (Hatch) Garay & Christenson由于花瓣长度和开放程度的差异而在种级上被分开，澳大利亚种的花较小，开放较晚。由此可见，澳大利亚和新西兰的花长预计呈双峰分布，峰值分别为0.3毫米和5.5毫米。对澳大利亚、加拿大和新南威尔士州所有可用的植物标本馆标本的花进行了测量，发现花的长度是单峰的，在澳大利亚和新西兰的植物中几乎相同。在澳大利亚和新西兰的丹霞标本中，花的大小变化有两个重要的组成部分:个体间变异和个体发生变异(花的大小随着年龄的增长而增加)。先前记录的两个物种的尺寸分别反映了在新西兰和澳大利亚存在的花大小变化范围的上限和下限。在植物标本馆的材料中，新西兰标本上20%的花和澳大利亚标本上40%的花表现出开放的迹象。花的大小和开放之间没有相关性，如果这两个物种都存在于澳大利亚和/或新西兰，这可能是意料之中的。无论是生物地理环境、传粉系统还是形态学证据，都不支持南方丹哈奇亚和新荷兰丹哈奇亚是不同的物种。

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来源期刊

Telopea PLANT SCIENCES-

CiteScore

1.30

自引率

42.90%

发文量

期刊介绍： Manuscripts submitted for publication in TELOPEA are published online, after peer review and acceptance by the TELOPEA Editorial Committee and when final editorial formatting has been completed. The journal specialises in plant systematics and phylogeny. The geographic scope of the journal encompasses Australia, Malesia, Melanesia, Micronesia, and Polynesia. The suitability of a work for the journal depends on the topic and the region of origin, generally the narrower the focus of the manuscript the closer to New South Wales must be its geographic focus. As a general guide, we will consider: 1) revisionary treatments and other substantial bodies of work from any of the regions mentioned above. 2) new species from any Australian state. 3) new country records for Australia from any state. 4) new state records from New South Wales only. However, we aim to support botanical research across the broader Australasian and Pacific region, and will consider submissions on their merit. Generally we will not consider extraterritorial new country records, or single lectotypification papers unless they pertain to New South Wales taxa, or have significant bearing on the Australian flora.