ISSN:0040-0262    

DOI:10.2307/1223297

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryMagill, R. E.: Conserved names for mosses: a brief history. ‐Taxon42: 5‐15. 1993. ‐ ISSN 0040‐0262.The lists of ‘nomina conservanda’ of mosses currently contain names of 52 genera and 6 families. Included as an appendix to theInternational code of botanical nomenclature, the lists do not contain references to the original proposals or the Bryophyte Committee's deliberations. In the context of a historical overview of the subject, such references are here provided, since information included in past conservation proposals and Bryophyte Committee reports may be critical to the interpretation of previous proposals and the formulation of successful new ones.

ISSN:0040-0262    

DOI:10.2307/1223298

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryRobson, K. A., Maze, J., Scagel, R. K.&Banerjee, S.: Ontogeny, phylogeny and intraspecific variation in North AmericanAbiesMill.(Pinaceae):an empirical approach to organization and evolution.‐Taxon42:17‐34. 1993. ‐ ISSN 0040‐0262.In view of the relevance of hierarchical organization and historical constrain for evolutionary theory, and of the lack of a suitable methodology to study these phenomena, attempts to simultaneously examine the ontogeny and phylogeny of a monophyletic group are thought to be promising. As an example, a multi‐level study of the genusAbiesis presented. First, the phylogenetic relationships for a subset of North American species ofAbies aretentatively clarified through a cladistic study using data from existing treatments and combined outgroups. Second, intraspecific variation is analysed for most of the same fir species from continuous variables describing vegetative structures (from both immature and mature trees) and features of the cones. The results are presented in graphical form, allowing patterns of variable inter‐correlations and their changes through ontogenetic time to be compared with phylogenetic patterns. The potential of such quantitative studies for the description of biological organization and further understanding of evolutionary phenomena is discussed in the light of recent theories of evolution.

ISSN:0040-0262    

DOI:10.2307/1223299

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryGraham, S. A., Oginuma, K., Raven, P. H.&Tobe, H.: Chromosome numbers inSonneratiaandDuabanga (Lythraceaes.l.) and their systematic significance. ‐Taxon42: 35‐41. 1993. ‐ISSN 0040‐0262.Published chromosome numbers inSonneratiaandDuabangaare inconsistent and indicate the basic numbers of the two genera arex =9 or 11 andx =12, respectively. Chromosome number counts made in this study for three species ofSonneratiaindicate 2n =24, and for two species ofDuabanga, 2n =48. The base is established asx =12 in both genera. Although the genera have accumulated numerous autapomorphies that lead them to be regarded in separate subfamiliesSonneratioideaeandDuabangoideaeof theLythraceaes.l., they share karyologically similar chromosomes and a unique basic number for the family, which isx =8 in the remaining subfamiliesPunicoideaeandLythroideae. SonneratiaandDuabangaare regarded as among the most primitive genera of theLythraceaes.l. A number of other myrtalean higher taxa also havex= 12. This base number is most likely the ancestral number for the order.

ISSN:0040-0262    

DOI:10.2307/1223300

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummarySchutte, A. L.&Van Wyk, B‐E.: The reinstatement of the genusXiphotheca (Fabaceae). ‐Taxon42: 43‐49. 1993. ‐ ISSN 0040‐0262.The reinstatement of the genusXiphothecaEckl.&Zeyh.(Fabaceae, tribeLiparieae)is proposed. A study of the morphology and alkaloids of the genusPriestleyaDC. has shown remarkable differences between its two sections,P. sect.Priestleyaand sect.AneisotheaDC.(= Xiphotheca). The latter differs in its geminate flowers, the non‐intrusive calyx, the obtuse and pocketed keel petals, the uniform anthers, the shortly petiolate and pinnately veined leaves and the unique combination of alkaloids. A brief synopsis of the genus, including nomenclature, synonymy and typification, is presented.

ISSN:0040-0262    

DOI:10.2307/1223301

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryMaxted, N., White, R. J.&Allkin, R.: The automatic synthesis of descriptive data using the taxonomic hierarchy. ‐Taxon42: 51‐62. 1993. ‐ ISSN 0040‐0262.Descriptive data about taxa at one level of the taxonomic hierarchy may be inferred from representative data referable to another level. The process is bi‐directional. Data agglomeration enables taxon characteristics to be derived from the characteristics of a subordinate level and data propagation enables taxon characteristics to be derived from the characteristics of a superior taxonomic level. This applies to any form of descriptive taxonomic data (e.g. morphological, cytological, distributional, uses, etc.) and at all levels of the taxonomic hierarchy. Examples taken from a revision for the production of DELTA format descriptions and distribution data are discussed. The major advantages of implementing these processes in a database system are: products and queries are based directly on representative data; they can be derived automatically from the data set without the necessary intervention of a taxonomist; less work is required to synthesize products or answer queries; there is greater guarantee of database integrity; data redundancy is reduced and thus storage space is conserved. The use of these processes should play a central part in any development of taxonomically intelligent database management systems.

ISSN:0040-0262    

DOI:10.2307/1223302

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryHaber, E.: Desktop computer mapping at the National Herbarium of Canada. ‐Taxon42: 63‐70. 1993. ‐ ISSN 0040‐0262.A versatile and relatively inexpensive PC mapping system in use at the National Herbarium of Canada is described and examples of its capabilities and use are given. Sources of place name databases with coordinates for Canada and the U.S.A. are also mentioned, and a simple method of creating color slides from the computer monitor is described.

ISSN:0040-0262    

DOI:10.2307/1223303

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryRiding, R.:Shamovella obscura:the correct name forTubiphytes obscurus(Fossil). ‐Taxon42: 71‐73. 1993. ISSN 0040‐0262.An earlier generic name,Shamovella, hitherto thought invalid, is found to be validly published. A needed new combination,Shamovella obscura, is made.

ISSN:0040-0262    

DOI:10.2307/1223304

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryPhilippe, M.: Nomenclature générique des trachéidoxyles fossiles mésozoïques à champs araucarioïdes. ‐Taxon42: 74‐80. 1993. ‐ ISSN 0040‐0262.Many studies on fossil woods did not respect theInternational code of botanical nomenclature. As a result their nomenclature is complex and fluctuating. During preparation of a thesis on Jurassic fossil woods from Franche‐Comté (northeastern France), problems have arisen with the nomenclature of gymnospermous woods with araucarioid cross‐field pitting. This work is a nomenclatural review of the twenty‐one generic names that have been used to designate mesozoic tracheidoxyls with araucarioid cross‐fields. Only eight are legitimate and can be justifiably used. As a taxonomic summary, a generic key is proposed.

ISSN:0040-0262    

DOI:10.2307/1223305

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryFarjon, A.: Nomenclature of the Mexican cypress or “cedar of Goa”,Cupressus lusitanicaMill.(Cupressaceae). ‐ Taxon42: 81‐84. 1993. ‐ ISSN 0040‐0262.Vagaries regarding the origin and taxonomic relationship of the second true cypress described after Linnaeus'sCupressus sempervirensresult in the current use of two to three binomials for what is beyond doubt a single species. By identification of the holotype of Miller's name and the evaluation of some historical facts concerning Miller's source trees, the correct botanical name for the Mexican cypress is established and its principal synonymy given.

ISSN:0040-0262    

DOI:10.2307/1223306

出版商:Wiley    

年代:2019

数据来源: WILEY