摘要:

SummaryThis paper brings together information about Swartz's travels in Jamaica, which have hitherto been obscure, and about his four major works concerned with West Indian plants.

ISSN:0040-0262    

DOI:10.2307/1219590

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.1002/j.1996-8175.1980.tb00583.x

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryThere was a close interaction between Linnaeus and botanists in Russia. Linnaeus corresponded with many of them, both native Russians and foreign scholars working in Russia. Their letters illustrate the deep concern with identification which dominated botany in the eighteenth century. Through his contacts in Russia, Linnaeus acquired specimens from the earliest collections made in Russia and Siberia and was able to include them in the Species Plantarum. Linnaeus influenced the early development of modern botany in Russia through established scholars working there, and also through Russians who studied under him at Uppsala. Many dissertations reflect Linnaeus' interest in the Russian and Siberian flora. Linnaeus' published works were used in Russian medical schools and some were translated into Russian at the end of the century. Linnaeus had a high opinion of the achievements of Russian botany in the eighteenth century. Collections made throughout the Russian Empire greatly increased the knowledge of the world's flora.

ISSN:0040-0262    

DOI:10.2307/1219592

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryIn this paper a correlation between polyploid level and esterase isozyme pattern in individuals from different Spanish populations ofMuscari atlanticumhas been established. We have taken advantage of this correlation to make a study of the distribution of the reported polyploid levels in 1,017 individuals from thirteen natural populations. The interest in and application of this method for bio geographical analysis are discussed.

ISSN:0040-0262    

DOI:10.2307/1219593

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryThe absence of flavonoids in otherwise perfectly preserved tropical plant specimens suggest that chemical solutions used to preserve these specimens in the field are responsible for the removal (i.e. pre‐extraction) of flavonoids during pressing and storage in the field. Accordingly, seventeen temperate plant taxa representing two fem and nine angiosperm families were subjected to collecting procedures and preservative solutions typically used in tropical field work. These solutions, especially those containing formaldehyde, effectively “pre‐extracted” flavonoids and other phenolics from plants placed in presses and stored in plastic bags, and the newspaper blotter in which the chemically treated specimen had been stored could also be extracted and upon two‐dimensional paper chromatography show a partial flavonoid “profile” of spots corresponding to that observed in the “donor” species. Direct extraction of fresh or dried material in flasks with any of the common preservatives used confirms that all of these solutions are highly effective in extracting flavonoids. It is recommended that chemical preservatives not be employed indiscriminately on plant material to be used later in chemotaxonomic surveys.

ISSN:0040-0262    

DOI:10.2307/1219594

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryA generalized system for the concise representation and manipulation of taxonomic descriptions is described. The system is versatile, easy to understand, and designed to minimise coding errors. The descriptions can replace natural‐language descriptions both at the time of recording and in publications. The descriptions are also computer‐readable, and a program is available for translation into natural language and into the formats required by some key‐generation and numerical‐classification programs.

ISSN:0040-0262    

DOI:10.2307/1219595

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryThe theory and application of polyclave keys are discussed with details of formatting and production of decks.

ISSN:0040-0262    

DOI:10.2307/1219596

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.1002/j.1996-8175.1980.tb00589.x

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryIn studies where hybridization is suspected, data frequently are presented as Anderson pictorialized scatter diagrams and Anderson hybrid indices. These two techniques, however, introduce inherent biases which influence the reader's interpretation of the data. In this article a new method based on a euclidean distance coefficient is suggested as a replacement for both the pictorialized scatter diagram and hybrid index. It is as simple to perform as the Andersonian techniques but relatively free of biases. Morphological data onMimulus longiflorusandM. flemingiifrom Santa Cruz Island, California, were gathered to illustrate the new index of hybridization and to show its advantages over the traditional Anderson pictorialized scatter diagram and hybrid index. Model examples are also used to compare these techniques of data analysis.

ISSN:0040-0262    

DOI:10.2307/1219597

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.1002/j.1996-8175.1980.tb00591.x

出版商:Wiley    

年代:2019

数据来源: WILEY