摘要:

SummaryThe taxonomic entities called genus and species are, though very much in use, still vaguely defined. Through the study of different modern authors one can approximate their meaning to a sufficient degree of precision to allow the formulation of a mathematical model. The species will be defined as the set of all genetically similar individuals, barring differences that reside at the allele level. We will then consider the “species such as in nature” to be the union of certain vital neighborhoods in a multi‐dimensional space, the said intervals obviously being those that correspond to the given species. This concept will be used to define, with an evolutionary tree pattern, the genus. The genus will then be the set of species, linked by monophyletism, that form an evolutionary peak in the space of “conditions of life”.

ISSN:0040-0262    

DOI:10.2307/1218824

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryA ‘large’ family of flowering plants is here defined as a family for which a taxonomist would need ten or more years to complete a monographic treatment, or a revision for one of the major floras. The number of such families increases because of the increase in materials and secondary literature. The only possible way of completing monographs or revisions of such major groups seems to be by means of team‐work.

ISSN:0040-0262    

DOI:10.2307/1218825

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryIn October, 1967, a symposium entitled “Systematics of the family Gramineae” was held in Kôbe Japan, as a part of the 32nd Annual Meeting of the Botanical Society of Japan. Besides the introductory remarks given by the present author, the following three papers were presented: Systematic significance of underground organs of grass seedlings, by K. Hoshikawa; Amino acid pattern of grass seed and systematics, by H. Taira; Temperature responses and systematics of the Gramineae. by S. Kawanabe. All these three speakers have their own field of research outside of systematics, but they have attempted to combine the results of their investigations with systematics. The present paper aims to discuss the positions of these contributions in modern grass systematics.

ISSN:0040-0262    

DOI:10.2307/1218826

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummarySome of the taxonomic problems concerning continuous variation referred to by Böcher (1967) are exemplified in the snow gum of south‐eastern Australia,Eucalyptus paucifloraSieb. ex Spreng.A taxonomic study of this species was carried out in connection with an investigation of altitudinal variation in the Brindabella Range, near Canberra, where continuous though not pure stands occur between 4,000 and just over 6,000 feet (Green 1967). The species is here discussed over its whole range of distribution in south‐eastern Australia, although special emphasis is placed on the forms considered to occur in the study area.

ISSN:0040-0262    

DOI:10.2307/1218827

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryRecent taxonomic treatments of the cultivated species ofCapsicumare discussed and divergent opinions on the names to be employed for some of these demonstrated. It is concluded that five species are widely cultivated and that the correct names for these areC. pubescensR.&P.,C. annuumL.,C. baccatumL.,C. frutescensL., andC. chinenseJacq.

ISSN:0040-0262    

DOI:10.2307/1218828

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryThe termisoplethsis proposed as a general term for specimens bearing the same collector's or collection number. Examples are given of isopleths of holotypes which are not isotypes, i.e. which were not seen by the original author of the name in question.

ISSN:0040-0262    

DOI:10.2307/1218829

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryNew chromosome counts based on collections of Winteraceae have strengthened the conclusion, suggested by morphological and anatomical study, that the two Sections(TasmanniaandDrimys) traditionally treated in the genusDrimysJ. R.&G. Forst. are very distinct and merit full generic status. ConsequentlyTasmanniaR. Br. ex DC. is herewith reinstated and a number of required new combinations are proposed.

ISSN:0040-0262    

DOI:10.2307/1218830

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryThe determination of the species of the moss genusPlagiotheciumBr., Schimp. et Gümb. is difficult owing to the great morphological variability of these taxa. With a view to smooth things down for the bryologist and to reduce errors in identification, Fisher's discriminant functions (1951) are applied to seven belgian species ofPlagliothecium: P. latebricola, P. laetum, P. curvifolium, P. denticulatum, P. sylvaticum, P. succulentum, P. roeseanum. The functions are based upon five quantitative characters concerned in the classification of that moss genus: length of the leaf, of the median leaf cells and of the four cells long propagula, width of the leaf and of the median leaf cells.From the measurements of these morphological features, it is easy to determine any specimen with a minimum probability of mistakes.

ISSN:0040-0262    

DOI:10.2307/1218831

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryVitaliana primulifloraBertol. is based on the same type asPrimula vitalianaL. Linnaeus inSp. Pl. 143 (1753) included two geographical elements in hisPrimula vitaliana, one, from Italy based on a plate of Sesler and the other from the Pyrenees on a specimen in the Burser Herbarium. Recent authors have typified the name differently. It is proposed here that the namePrimula vitalianaL. and thereforeVitaliana primulifloraBertol. be based on Sesler's plate.

ISSN:0040-0262    

DOI:10.2307/1218832

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.2307/1218833

出版商:Wiley    

年代:2019

数据来源: WILEY