摘要:

SummaryBiosystematics should not develop into a superior synthetic science; it should deliver material for the modern taxonomic synthesis. It should not only continue to produce chromosome numbers, but also to provide taxonomists with information about chromosomal behaviour during meiosis, ecotypical variation, sterility barriers, etc. However, it should not only act as a supporting branch of science, but it should keep its own face, stamped by experimental work. Specialisation in the field of evolution in plants is needed, thereby obtaining a deeper understanding of variation and evolution in relation to the environment. Divergent as well as convergent evolution must be understood just as well as the phenomenon of ‘adaptation’.

ISSN:0040-0262    

DOI:10.2307/1217906

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryThe necessity of microscopic examination of Composite flowers is reviewed. Results of observations include listing of generic distinctions forStevia, Brickellia, andLiatris;description of a distinctive hair type inFlaveria;confirmation of characteristic pollen type in the Vemonieae; recognition of a characteristically keeled anther appendage in the Helenieae‐Heliantheae complex; discovery of distinctive characters in anther appendages and exothecial cells of Eupatorieae, Astereae, Senecioneae, and Inuleae; discovery of characters of the anther appendage and exothecial cells that help show generic and sectional limits inTridax;and description of distinctive corolla lobe structure inInula, Marshallia, Flaveria, andMelampodium.

ISSN:0040-0262    

DOI:10.2307/1217907

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryThe criteria for maximal efficiency in identification keys are briefly reviewed. Some techniques for meeting these criteria in a system using numerically coded data are described. The general structure of a key‐forming program written for an I.C.L. 1301 computer is given. The performance of this program using a small set of data is briefly reported and some desirable refinements are noted. The results of this study were generally satisfactory and the system shows promise in the rapid production of keys for a variety of special uses.

ISSN:0040-0262    

DOI:10.2307/1217908

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryIn 1891 W. A. Kellerman came to The Ohio State University as Professor of Botany, which position he held until his death in Guatemala on March 8, 1908. From January through March of the years 1905 through 1908, Kellerman made four collecting trips to Guatemala on which parasitic fungi and vascular plant material were secured. Prior to the 1908 trip Dr. Keller‐man's Tropical School of Botany was organized with its first session scheduled for the winter of 1908. New taxa were described from Kellerman's Guatemalan collections, of which twenty‐one fungus and forty‐one vascular plant taxa are known. Itineraries and maps were constructed for each trip based predominantly on 1152 specimen labels in The Ohio State University Herbarium. The information from these itineraries will enable herbaria that have inadequately labeled material to supplement specimen labels with pertinent information of either place or date of collection.

ISSN:0040-0262    

DOI:10.2307/1217909

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryA review of the main results of the discussions on botanical nomenclature at the Eleventh International Botanical Congress at Seattle, 22–24 August 1969. The International Code of Botanical Nomenclature remains practically unchanged. Minor amendments include a restriction of the phenomenon of ‘automatically created tautonyms’ (to be called autonyms), a further precision of the rules concerning names of hybrids, and a loosening of the rule governing superfluous names.

ISSN:0040-0262    

DOI:10.2307/1217910

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.1002/j.1996-8175.1970.tb02975.x

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.1002/j.1996-8175.1970.tb02976.x

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummarySome ideas about future problems of Botanical Gardens. — Botanical Gardens should lay out special “conservation departments” in order to prevent the extinction of plant species. This program of conservation needs international cooperation. Conditions for success are regional specialization, restriction of the number of species in each garden, and utmost care in cultivation.

ISSN:0040-0262    

DOI:10.2307/1217913

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryCriticisms of the quality of Seed Lists issued by Botanic Gardens, have been directed towards failures either to identify accurately the seed offered, or to ensure its viability or to provide information on its origin.These shortcomings can be remedied only by spending more time on each seed sample than at present. One way of gaining this time is to prolong seed viability to a maximum by providing good storage conditions. This avoids the necessity for frequently repeated collections of seed with the advantage that documentation on any particular collection remains relevant for a long period.No single storage condition suits all species and experiments at Kew are directed towards establishing optimum needs of different species. with the aim of maintaining viability in store of seventy‐five percent or more of the species involved for at least ten to fifteen years. This would allow the establishment of a bank of seed which could be built up from year to year with time for adequate documentation of every species.

ISSN:0040-0262    

DOI:10.2307/1217914

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.1002/j.1996-8175.1970.tb02979.x

出版商:Wiley    

年代:2019

数据来源: WILEY