摘要:

AbstractDer folgende Beitrag ist eine Fortsetzung meiner nomenklatorischen Arbeiten in Feddes Repertorium73(1966) 47—58;79(1969) 409—421;83(1973) 645—662;85(1974) 641 bis 661; 88 (1977) 307—321;90(1979)

ISSN:0014-8962    

DOI:10.1002/fedr.19820930102

出版商:Wiley‐VCH Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractThe karyology ofCarex flavaaggregate in Switzerland was investigated. Fertility was measured and crossings were done.The microsporogenesis is described.In Switzerland, theC. flavagroup consists ofC. flavavar.flava(n = 30, 31),C. flavavar.alpina(n = 30, 31),C. lepidocarpa(n = 34),C. demissa(n = 34, 35), andC. serotina(n = 34, 35, 36). The three species with high chromosome numbers often grow together withC. flava. Accordingly, F1‐hybrids with this parental species are frequent. Their meiosis and fertility are profoundly disturbed. With artificial hybrids, disturbances decrease as the differences in chromosome numbers of the parents decrease. Backcrossings with the parents over many generations lead to forms identical in morphology and fertility to the pure species, which are called stabilized cryptic backcrosses. The extensive genetic and karyotype‐variability within populations, particularly ofC. flava, might be due to this introgression. In other parts of Europe (e.g. Britain) hybrids withC. flavaas one parent are rare. As a consequence, introgression plays a little role and karyotypes are stable.Karyotype evolution inC. flavagroup is quite different from karyotype evolution in otherCarexspecies. This is due to differences in life history tact

ISSN:0014-8962    

DOI:10.1002/fedr.19820930103

出版商:Wiley‐VCH Verlag    

年代:1982

数据来源: WILEY

ISSN:0014-8962    

DOI:10.1002/fedr.19820930104

出版商:Wiley‐VCH Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractTwo species of the genusAgeratumL., viz.,A. conyzoidesandA. houstonianumare rather poorly distinguished morphologically. The former which has sparsely hairy involucre bracts and light blue heads is distributed throughout India. The latter is known to occur in Northern parts of the country and has densely hairy bracts and blue heads. Polygraph constructed on the basis of taximetric analyses of 16 quantitative characters, revealed significant similarities in most of the characters. They were also found similar in trichome types, the details of these have been discussed by the author (1979). On the basis of these studies it appears that two species which are not very clearly distinguishable, may better be merged together into one species andA. houstonianummay be treated as varietyhoustonianumof the speciesA. conyzoides.

ISSN:0014-8962    

DOI:10.1002/fedr.19820930105

出版商:Wiley‐VCH Verlag    

年代:1982

数据来源: WILEY

ISSN:0014-8962    

DOI:10.1002/fedr.19820930107

出版商:Wiley‐VCH Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractThree new species ofAnthracothecium, viz.A. pustuliferum, A. pseudohimalayenseandA. pseudocyphellatumfrom the Eastern Himalayas (India) are described and illustrated.

ISSN:0014-8962    

DOI:10.1002/fedr.19820930108

出版商:Wiley‐VCH Verlag    

年代:1982

数据来源: WILEY

ISSN:0014-8962    

DOI:10.1002/fedr.19820930109

出版商:Wiley‐VCH Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractA great morphological variation inNepeta nudaL. is firstly reported; it especially refers to the characters which distinguish its two subspeciesnudaandalbiflora. The existence of the gynodioecious condition in this species is also firstly noted.

ISSN:0014-8962    

DOI:10.1002/fedr.19820930110

出版商:Wiley‐VCH Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractYoung stages of the seedlings ontogeny of sixteenAchilleataxa were observed and some characters of their morphology were described as well as presented on drawings and photographs. Similarity of seedlings of some taxa was discussed.

ISSN:0014-8962    

DOI:10.1002/fedr.19820930111

出版商:Wiley‐VCH Verlag    

年代:1982

数据来源: WILEY

ISSN:0014-8962    

DOI:10.1002/fedr.19820930112

出版商:Wiley‐VCH Verlag    

年代:1982

数据来源: WILEY