摘要:

Dahlgaard, J.&Warncke, E. 1995. Seed set and germination in crosses within and between two geographically isolated small populations ofSaxifraga hirculusin Denmark. ‐ Nord. J. Bot. 15: 337–341. Copenhagen. ISSN 0107–055X.Seed set and germination were studied in two geographically isolated populations ofSaxifraga hirculusin Jutland, Denmark. The size of the populations differed, but both were assumed to exhibit significant genetic homogeneity and inbreeding due to (1) small population size (2) limited pollen flow and seed dispersal and (3) absence of gene flow between populations. Crosses within populations, as well as reciprocal crosses between populations, were carried out in the field. Seed number, proportion of developing seeds, germination percent, and germination rate were found to be greater for crosses between populations than for crosses within populations. Variation in seed size was found to be larger for maternal plants from the smaller popul

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1995.tb00159.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1995.tb00160.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Larsson, G. 1995. Nomenclatural remarks on theSalix viminalisgroup in Norden. —Nord. J. Bot. 15: 343–346. Copenhagen. ISSN 0107–05513.The taxa in theSalix viminalisgroup which have been found in Norden are lectotyp‐ified:S. viminalis, S. dasyclados, S. xsmithiana, S. xstipularisandS. xcalodendron. Flora Nordica notes

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1995.tb00161.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Bjømstad, O. N., Iversen, A.&Hansen, M. 1995. The spatial structure of the gene pool of a viviparous population ofPoa alpina— environmental controls and spatial constraints. — Nord. J. Bot. 15: 347–354. Copenhagen. ISSN 0107–055X.Because both the genetic make‐up and the environmental conditions of a population are spatially autocorrelated, it is difficult to infer processes of selection or drift for population genetic mappings. We propose a methodology based on partial Mantel techniques and partial autocorrelation techniques to separate the action of these processes. The method is applied to data onPoa alpinato indicate that isolation‐by‐distance (drift) is the main process inducing positive autocorrelation at the scale of diaspore dispersal (<100m). The pattern at larger distances is more consistent

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1995.tb00162.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Andersson, 2. 1995. Crossability variation in four South AmericanHordeumspecies— Nord. J. Bot. IS: 355–364. Copenhagen. ISSN 0107–055X.Intra‐ and interpopulation crosses within the four South AmericanHordeumspecies,H. cordobense, H. chilense, H. muticumandH. stenostachyswere performed. Seeds were obtained in all intrapopulation crosses within all four species.Hordeum cordobenseshowed little variation in crossability of interpopulation crosses and the F1‐families had rather high fertility. A wide range in crossability between populations was observed in the three speciesH. chilense, H. muticumandH. stenostachys. Some combinations failed to set seed while others had high seed set. The fertility of the F1‐‐families varied from almost sterile to fully fertile. All parental plants, intra and interpopulation hybrids in the four species had very high meiotic pairing frequency with 12–14 chiasmata per cell.Hordeum cordobenseis a homogeneous species while the other three species are heterogeneous and gene

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1995.tb00163.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Monasterio‐Huelin. E. 1995. Taxonomv and distribution of the genusRubus(Rosaceae) seriesRaduluon the Iberian Peninsula. — Nord. J. Bot. 15: 365–373. Copenhagen. ISSN 0107–055X.The majority of european batologists currently interpret the ser.Radulain a sense different from that given by its original author. According to the modem concept, this series is separated into two, distinguished by the leaflets felted beneath (ser.Radula) versus not felted (ser.Pallidi). Following this criterion, we include 7 species in ser.Radula, one of which (R. pauanus) is described as new, and provide a photograph of the holotype, an analysis of pollen, and a distribution map. Also provided are keys to the series of the subgenusRubusand to the species of the ser.Radula, and a comparative study from a morphological and biogeographical perspective of all species which comprise this series on the Iberian Pe

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1995.tb00164.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1995.tb00165.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Anderberg, A. A.&Karis, P. O. 1995.Psednotrichia, a genus of the tribe Senecioneae hitherto misplaced in the Astereae (Asteraceae). — Nord. J. Bot. 15: 375–379. Copenhagen. ISSN 0107–055X.The tribal position for the little known genusPsednorrichia, is established. This monotypic genus, hitherto placed in the tribe Astereae, is a congener ofXyridopsisof the tribe Senecioneae (Asteraceae). The two species ofXyridopsisare here transferred toPsednotrichiaand the new combinationsP. xyridopsisandP. newtoniiare made. A brief discussion of the morphology of the genus, and its systematic position within the tribe Senecioneae is pro

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1995.tb00166.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1995.tb00167.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Pedersen, H. Æ. 1995. Thirteen new species ofDendrochilum(Orchidaceae), a new record from Burma, and a checklist of the genus in East Malesia. — Nord. J. Bot. 15: 381402. Copenhagen. ISSN 0107–055X.Seven new species ofDendrochilumare described from the Philippines, viz.D. amesianum, D. flexuosum, D. louisianum, D. parvipapillatum, D. plocoglottoides, D. quisumbingianumandD. tetradactyliferum. The widespread speciesD. longifoliumis recorded from Burma for the first time, and an annotated checklist ofDendrochilumin East Malesia, i.e. the Lesser Sunda Islands, Sulawesi, the Moluccas, and New Guinea is given. This list enumerates a total of 21 species, includingD. cornutumandD. pallideflavenswhich are here recorded from East Malesia for the first time. Six species in the checklist are described as new, viz.D. ambangense, D. citrinum, D. erectila‐bium, D. eymae, D. galeatum, andD. longipedice

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1995.tb00168.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY