摘要:

SummaryAustin, D. F.&Huáman, Z.: A synopsis ofIpomoea (Convolvulaceae)in the Americas. – Taxon 45: 3‐38. 1996. – ISSN 0040‐0262.A total of 339 taxa (327 species, five varieties, five subspecies) currently are recognized in the Americas, with the caveat that additional taxa exist that are unstudied and undescribed. Those species recognized are placed, when possible, in infrageneric categories. Known distributions are given for each taxon. Synonyms and names of uncertain application are listed.

ISSN:0040-0262    

DOI:10.2307/1222581

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryGarcia‐Jacas, N., Susanna, A.&İlarslan, R.: Aneuploidy in theCentaureinae (Compositae): isn= 7 the end of the series? – Taxon 45: 39‐42.1996. – ISSN 0040‐0262.The subtribeCentaureinaeis known for its remarkable aneuploidy, fromn= 16 ton= 8. A new, even lower basic number is added to the series,n= 7 forCentaurea patula(sect.Ammocyanus). Correlations between the aneuploid series and morphology, biogeography and DNA‐based phytogeny of the subtribe are suggested.

ISSN:0040-0262    

DOI:10.2307/1222582

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryNicolson, D. H.: Issue dates of the first 83 numbers of theSmithsonian contributions to botany.– Taxon 45: 43‐48. 1996. – ISSN 0040‐0262.The official date of publication of eachContributionis given, with author(s), title, and pagination. Special problems, due to inconsistencies in the sources of issue dates (hand‐stamped in a few copies and published in theSmithsonian year), are discussed. The issue dates appearing in theSmithsonian yearare reliable, except in recent years when the published date sometimes was incomplete.

ISSN:0040-0262    

DOI:10.2307/1222583

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryStern, M. J.&Eriksson, T.: Symbioses in herbaria: recommendations for more positive interactions between plant systematists and ecologists. – Taxon 45: 49‐58.1996. – ISSN 0040‐0262.Herbarium collections have traditionally been used primarily by systematists, including monographers and writers of floras. It is suggested here that herbarium material has eclectic value for use by many non‐traditional users, but only to the extent that care is taken by collectors and other researchers who benefit from collections. Suggestive examples relating to ecology, conservation biology, and systematics are presented (drawing on studies of distribution, plasticity, epiphylls, insect‐plant associations, molecular phylogenetics, and population genetics) where herbarium material would have been more valuable if it had been collected with potential multiple uses in mind. It is also argued that the quality of specimens is in most cases more important than their quantity.

ISSN:0040-0262    

DOI:10.2307/1222584

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryJohnson, S. D.: Pollination, adaptation and speciation models in the Cape flora of South Africa. – Taxon 45: 59‐66. 1996. – ISSN 0040‐0262.Recent species definitions have placed emphasis on “diagnostic characters” rather than isolating mechanisms. Such characters can be informative about the evolutionary processes which lead to speciation in highly diversified plant groups, such as those found in the Cape floral region of South Africa. Rampant speciation in the Cape flora has often been attributed to heterogeneity of the physical environment, yet many large Cape genera show radiation in floral, rather than vegetative, characters, which suggests that adaptation to pollinators has played a major role in speciation. Selection for more efficient pollination systems in a pollinator‐limited context, rather than isolating mechanisms, is suggested to be the primary driving force behind floral evolution in the Cape flora.

ISSN:0040-0262    

DOI:10.2307/1222585

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryHong, D.‐Y., Pan, K.‐Y.&Pei, Y.‐L.: The identity ofPaeonia decompositaHand.‐Mazz. – Taxon 45: 67‐69. 1996. – ISSN 0040‐0262.Paeonia decomposita, which has been ignored or considered synonymous withP. suffruticosa, is shown to be an earlier name forP. szechuanica.A detailed description is provided of this beautiful woody peony only known from a small area in N.W. Sichuan, China.

ISSN:0040-0262    

DOI:10.2307/1222586

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryParnell, J.&Waldren, S.: Detrended correspondence analysis in the ordination of data for phenetics and cladistics. – Taxon 45: 71‐84. 1996. – ISSN 0040‐0262.Most methods of morphometric and phylogenetic analysis do not permit the incorporation of both categorical and quantitative data. Detrended correspondence analysis (DCA) was used to produce ordination diagrams of strictly categorical data from a cladistic analysis, and mixed data from a morphometric study of hybridization. In both cases it proved preferable to standardize the data prior to DCA, because increased separation on ordination was found when larger scale ranges were used. A standardization is suggested, such that characters are scaled on a range from 1 to the total number of characters scored; this will produce more informative ordinations if large numbers of characters are scored. When used in conjunction with appropriate cladograms this phenetic technique may help reveal features such as homoplasy which are not readily apparent in cladograms, while the capability of DCA to combine both categorical and quantitative characters is especially useful in morphometric studies and in areas of evolutionary biology, e.g. chronistic studies of extinction events in morphospace.

ISSN:0040-0262    

DOI:10.2307/1222587

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.2307/1222588

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.2307/1222589

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.2307/1222590

出版商:Wiley    

年代:2019

数据来源: WILEY