摘要:

SummaryThe coefficient of relevance Rjkis expanded to include homology by introduction of a new parameter Cjkto modify Rjk. Values of Cjkare inversely proportional to the rank and allow inclusion of subjective probability levels of Cjk. This gives to the taxonomist a measure of reliability of the portion of OTU's irrespective of the methods he choses to use.It is suggested that classification above the generic level might be quite arbitrary, although useful for some specific purpose.

ISSN:0040-0262    

DOI:10.2307/1219321

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryThere are several kinds of criteria for determining whether an average family of insects is comparable to an average family of mammals. Different combinations of criteria are appropriate for different purposes and give different results. A new metataxonomic criterion is explored for all phyla of animals and plants and for various subordinate taxa. Differences in it can be caused by sampling error, different degrees of splitting, and different patterns of evolution; these causes are more or less confounded but indicate the domain of the criterion's applicability. Body weight and other factors affect the number of species in genera and families. It is not yet known to what extent boundaries between taxa correspond to real subcontinuities in properties of the organisms. We should know what characters are, or have been, important to an organism, even for angiosperms, where little research has been directed at the problem as formulated here.

ISSN:0040-0262    

DOI:10.2307/1219322

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.1002/j.1996-8175.1973.tb03372.x

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryAs the work of one man, the Martindale herbarium was a remarkable achievement. By the 1880's, Isaac C. Martindale (1842‐1893), the Quaker botanist, of Camden, New Jersey, had brought together a vast herbarium, reputed at the time to be one of the largest private herbaria amassed in this country during the 19th century. After he died, the Martindale herbarium was sold in 1894 to the Philadelphia College of Pharmacy and Science. For the next 70 years the collection was largely forgotten and only rarely consulted.

ISSN:0040-0262    

DOI:10.2307/1219324

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.2307/1219325

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryThe tribal affinities and inter‐relationships of the Californian‐ChileanBlennospermaand the western AmericanCrocidium(Compositae) have been the subject of controversy since the mid‐nineteenth century. Most recent workers have placedBlennospermain the Helenieae andCrocidiumin the Senecioneae. Investigations of the flavonoids of these genera indicate that at the generic level both contain quercetin‐3‐o‐galactoside, (probably isomeric) quercetin‐3‐o‐glucoside, a quercetin‐3‐o‐polyglucoside, and luteolin‐7‐o‐glucoside. The first two compounds were present in all samples tested, but the other two glycosides were not. These striking biochemical similarities and the weight of morphological evidence suggest that the two genera are closely related to each other. Both should probably be placed in the Senecioneae.

ISSN:0040-0262    

DOI:10.2307/1219326

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryA hybrid swarm betweenHeterocentron elegansandH. glandulosumwas analyzed using a number of different methods: construction of a hybrid index; factor analysis; flavonoid composition; and pollen fertility. From these various studies, information is presented concerning the extent and significance of hybridization between the two species. In addition, the different methods of analysis are compared in terms of the type of information that they contribute.

ISSN:0040-0262    

DOI:10.2307/1219327

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.1002/j.1996-8175.1973.tb03377.x

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryC. libanotis, the type species of the monotypic Linnaean genusCachrys, is proved to comprise 2 genera:CachrysL. (incl.PrangosLindl.) andHippomarathrumLink non P.G. Gaertn., B. Mey.&Scherb. The relevant literature and possible type specimens are discussed. A Burser specimen (with ripe fruits), seen by Linnaeus and determined by him asC. libanotis, is chosen as the best admissible lectotype. This specimen agrees withCachrys trifidaMill. to which, therefore, the nameC. libanotishas to be reinstated. As a result of this typification the generic nameCachrysL. may be retained for the taxa conventionally considered asCachrysL. orPrangosLindl., whileHippomarathrumLink, being a later homonym, is proposed for conservation.

ISSN:0040-0262    

DOI:10.2307/1219329

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.2307/1219330

出版商:Wiley    

年代:2019

数据来源: WILEY