1. |
CONTRASTING MODES OF EVOLUTION IN TWO GROUPS OF PEREZIA(MUTISIEAE; COMPOSITAE) OF SOUTHERN SOUTH AMERICA |
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TAXON,
Volume 22,
Issue 5-6,
2019,
Page 525-536
Beryl B. Simpson,
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摘要:
SummaryTwo species groups of the closely knit South American section of the genusPereziaoccur in the Andes of southern America but differ conspicuously in the number of species they contain, and the habitat and amount of morphological specialization of their constituent species. These differences reflect the contrasting evolutionary histories of the two species groups. The evolutionary mode most significant in forming each group has been, in turn, determined by the age, geographical extent and vicissitudes of the habitat in which each group occurs. In one case, the habitat is old, covers a large continuous geographical area and has remained relatively stable since the arrival of the ancestral stock well before the Pleistocene. In the second case, the habitat is young, of discontinuous and often limited extent and has undergone numerous rapid alterations since its inception at the end of the Pliocene. In the first case the Pereziae have followed a course of phyletic evolution; in the second, a mode of true speciation.
ISSN:0040-0262
DOI:10.2307/1218627
出版商:Wiley
年代:2019
数据来源: WILEY
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2. |
A MORPHOLOGICAL HYPOTHESIS FOR THE ORIGIN OF HETEROSTYLY IN THE RUBIACEAE |
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TAXON,
Volume 22,
Issue 5-6,
2019,
Page 537-542
William R. Anderson,
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摘要:
SummaryDimorphic heterostyly is common in the Rubiaceae, distributed throughout the family in a way that suggests that it has evolved repeatedly. In its essentials this heterostyly suggests protandry in which some plants have normal elongation of the styles and others have precocious maturation of the stigmas at a stage of arrested elongation of the styles. It is suggested that the initiation of heterostyly in this family may lie in a modification of the common protandry. High reproductive fitness of the self‐pollinating short‐styled plants would begin a shift in the population from predominant outcrossing to predominant autogamy, even though the resulting homozygosity might be disadvantageous. This shift might be halted by the addition of diallelic self‐incompatibility of the kind regularly found in heterostylous plants. The population would then achieve the stable polymorphism characteristic of dimorphic heterostyly. Additional morphological refinements might accrue in time.
ISSN:0040-0262
DOI:10.2307/1218628
出版商:Wiley
年代:2019
数据来源: WILEY
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3. |
A BIOSYSTEMATIC APPROACH TO GENERIC DELIMITATION IN RUELLIA (ACANTHACEAE) |
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TAXON,
Volume 22,
Issue 5-6,
2019,
Page 543-555
Robert W. Long,
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摘要:
SummaryRuelliais a large, pantropical group of herbs and shrubs that has undergone a long series of changes in classification. Soon after Linnaeus's original description the genus was divided into numerous segregate genera by Nees von Esenbeck and by others. Later Bentham sunk 18 Neesian genera in his expanded concept ofRuellia, and this circumscription has come to be the accepted definition for the plants. Recently Bremekamp revived a number of old segregate groups and described several new ones. He believesRuellia sensu latois an unwieldy and unnatural assemblage of taxa.Experimental hybridizations have established the existence of species‐complexes (ecospecies) and species‐groups (comparia) inRuellia. The latter are genetically isolated from other species‐groups, and taxonomically they correspond to certain segregate genera. There is evidence that North American taxa are closely related to tropical species. Since numerous species can be artificially hybridized, application of the ecotype concept may provide a practical means of identifying natural species‐groups. Present evidence suggests thatRuellia, as generally understood, is not a natural, phyletic, unit.
ISSN:0040-0262
DOI:10.2307/1218629
出版商:Wiley
年代:2019
数据来源: WILEY
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4. |
HI‐IAPT Portraits of Botanists, no. 46. |
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TAXON,
Volume 22,
Issue 5-6,
2019,
Page 556-556
Jakob Juratzka,
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ISSN:0040-0262
DOI:10.1002/j.1996-8175.1973.tb03406.x
出版商:Wiley
年代:2019
数据来源: WILEY
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5. |
HENRI PITTIER'S BOTANICAL ACTIVITY IN PANAMA |
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TAXON,
Volume 22,
Issue 5-6,
2019,
Page 557-576
John D. Dwyer,
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摘要:
SummaryHenri Pittier was one of the most important plant collectors in the Republic of Panama during the time of the construction of the Panama Canal by the Americans (1903‐1914). The purpose of this paper is to discuss in detail Pittier's botanical activities in the Republic and to include a list of those collections which are type collections.
ISSN:0040-0262
DOI:10.2307/1218631
出版商:Wiley
年代:2019
数据来源: WILEY
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6. |
JUNIPERUS WASHINGTONENSIS, A SYNONYM OF GLYPTOSTROBUS NORDENSKIOLDI† |
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TAXON,
Volume 22,
Issue 5-6,
2019,
Page 577-578
James R. Butala,
Arthur A. Cridland,
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ISSN:0040-0262
DOI:10.2307/1218632
出版商:Wiley
年代:2019
数据来源: WILEY
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7. |
SECTIONAL NOMENCLATURE IN PAPAVER L.† |
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TAXON,
Volume 22,
Issue 5-6,
2019,
Page 579-582
Robert W. Kiger,
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摘要:
SummaryThe nomenclature and typification of the sections ofPapaverL. are reviewed and their correct names and synonymies are presented. The following taxa are lectotypified:Sect.CarinataeFedde, Lectotype species:Papaver macrostomumBoiss.&HuetSect.OxytonaBernh., Lectotype species:Papaver orientaleL.Sect.MacranthaElkan,nom. superfl., Lectotype species:Papaver orientaleL. [Genus]CalomeconSpach, Lectotype species:Calomecon orientale(L.) Spach (:Papaver orientaleL.)
ISSN:0040-0262
DOI:10.2307/1218633
出版商:Wiley
年代:2019
数据来源: WILEY
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8. |
THE TYPE OF CHYTRIDIUM OLLA A. BRAUN |
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TAXON,
Volume 22,
Issue 5-6,
2019,
Page 583-586
F. K. Sparrow,
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ISSN:0040-0262
DOI:10.2307/1218634
出版商:Wiley
年代:2019
数据来源: WILEY
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9. |
CHRYSOLARIX RENOUNCED ‐ A COMEDY OF RESTORATION |
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TAXON,
Volume 22,
Issue 5-6,
2019,
Page 587-589
Harold E. Moore,
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摘要:
SummaryChrysolarix amabilis(J. Nelson) H. E. Moore andPseudolarix amabilis(J. Nelson) Rehder have contended as names for the golden larch. The correct name isPseudolarix kaempferiGordon, a name which stands in its own right because the type ofPinus kaempferiLambert, a name cited in synonymy, was excluded from the concept by Gordon.
ISSN:0040-0262
DOI:10.2307/1218635
出版商:Wiley
年代:2019
数据来源: WILEY
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10. |
HI‐IAPT Portraits of Botanists, no. 47. |
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TAXON,
Volume 22,
Issue 5-6,
2019,
Page 590-590
Jean Louis Marie Poiret,
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ISSN:0040-0262
DOI:10.1002/j.1996-8175.1973.tb03412.x
出版商:Wiley
年代:2019
数据来源: WILEY
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