摘要:

SummaryAn earlier proposal thatConocephalum conicummay exist as a group of geographic races is supported by a more extensive survey of the flavonoid glycosides isolated from samples across its Northern Hemisphere distribution. European, North American, and Asian samples are clearly distinguished, and sub‐groups may be recognised within these broad subdivisions. The local Sino‐Japanese speciesC. supradecompositumis clearly distinguished on the basis of flavonoid glycosides fromC. conicum.

ISSN:0040-0262    

DOI:10.2307/1220075

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryFour weedy taxa ofBidensare common in Thunder Bay:B. cernua, B. connata, B. frondosaandB. vulgata.SinceB. connatais intermediate in gross morphology and ecological preference betweenB. cernuaandB. frondosa, and since it is only found in areas whereB. cernuaandB. frondosaare sympatric, an investigation was undertaken to determine whetherB. connatais of hybrid origin (B. cernua×B. frondosa). Representative specimens of the 4 taxa were scored for 23 morphological characters, and these data were analyzed by Principal Coordinates Analysis. Seed germination and pollen viability were determined to be high with no significant differences among the 4 taxa. Morphological and cytological data suggest thatB. connata(2n = 48) is the result of either a cross between an unreduced gamete ofB. cernua(2n = 24) with a normal gamete ofB. frondosa(2n = 48), or a cross between a 2n = 24 ofB. frondosawith a typical gamete ofB. cernua.SinceB. connatashows no decrease in seed viability and apparently produces pollen by mitosis only, Thunder Bay populations ofB. connataevidently comprise an agamic complex.

ISSN:0040-0262    

DOI:10.2307/1220076

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummarySelf‐incompatibility inSolanumappears to be largely restricted to species of subgenusPotatoe, providing further support for the separation of that group from subgenusSolanum.Loss of self‐incompatibility must have taken place early in the evolutionary histories of other subgenera. Possible adaptations for outcrossing, such as enantiostyly, dioecy and to a restricted degree, secondary self‐incompatibility, have subsequently arisen in certain members of these predominantly self‐compatible groups. The distribution of unilateral cross‐incompatibility inSolanumseems to parallel that of self‐incompatibility.

ISSN:0040-0262    

DOI:10.2307/1220077

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryA procedure has been described for interpreting the resemblance distance between objects which are represented by points in a multidimensional space, in terms of percentile radii about these points. An illustration of the procedure demonstrated its usefulness for the recognition and analysis of innate group structure.

ISSN:0040-0262    

DOI:10.2307/1220078

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryTaxonomy consists of three fundamentally different parts: (1) Representation, which consists of nominal, reproducible statements; (2) Ordering, which is a logical, verifiable science; and (3) Nomenclature, which is largely guided by practical application. Some proposals are made for the improvement of the scientific character of taxonomy.

ISSN:0040-0262    

DOI:10.2307/1220079

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryA brief review of the life of Robert Wight (1796‐1872) is presented. The contribution of Wight and his effort to bring to light the flora of India, particularly of the Peninsula, are focused. The publications of Wight (65 entries) are enumerated and sometimes annotated, as a guide to their contents. Some selected references on Wight are also appended.

ISSN:0040-0262    

DOI:10.2307/1220080

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryResearches on the actual type of this species are made. Historic inquiries have inevitably become necessary in order to elucidate the problems involved, but it has not always been possible to eliminate each element of doubt. The previous studies on the subject, particularly the ones by SCHOTT, ENGLER and HEPPER, have led to different and controversial interpretations of this taxon and its geographical distribution. This study permits re‐investigation of the taxonomy of this species on more solid grounds.

ISSN:0040-0262    

DOI:10.2307/1220081

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryThe taxonomic concept ofE. affinisis well established historically and the epithetaffinishas been fairly consistently applied to this taxon, particularly recently. Even though the original description and illustrations were, at least in part, based upon plants ofE. affinis, the potential type specimens presently in the original author's herbarium consist of another distinct, and probably only distantly related species,E. alpina.As the specimen in the collector's herbarium consists of bothE. affinisandE. alpina, it is concluded that the original description was based upon a mixed collection, a portion of which has since been removed. Therefore,E. affinisis lectotypified in the collector's herbarium in order to maintain the continuity established between the taxonomic concept and the epithet, in accordance with Recommendation 7B of the ICBN.

ISSN:0040-0262    

DOI:10.2307/1220082

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryTwo divergent opinions have been expressed on the typification ofTrichomanesL. Some authors selectT. scandensL. as the type on the basis of the first designation of a lectotype by J. Smith in 1875, and according to the taxonomic treatment of the genus after the date of its publication by Linnaeus. Other authors designateT. crispumL. as the type on the basis of the elements studied by Linnaeus up to the time in which the genus was validly published and of the indications to be found in his publications which enable us to ascertain his intent in establishing the genus. The arguments in favour of either lectotypification are thoroughly examined and the nomenclatural consequences of the designation ofT. scandensorT. crispumare envisaged. The conclusion is reached that the examination of Linnaeus's publications offers sufficient elements for an objective lectotypification ofTrichomanesonT. crispum.

ISSN:0040-0262    

DOI:10.2307/1220083

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryThe misapplication of the citation of three historically important type localities in Venezuela is noted as of frequent occurrence in monographs. The localities referred to are Colonia Tovar, collected by August Fendler, San Carlos de Río Negro, collected by Richard Spruce, and Roraima, collected by Robert Schomburgk, the principal collectors involved in these citations. The correct localities are indicated as being in the Estado Aragua for Colonia Tovar, and Venezuela for San Carlos de Río Negro and Roraima.

ISSN:0040-0262    

DOI:10.2307/1220084

出版商:Wiley    

年代:2019

数据来源: WILEY