| 1. |
- Thulin, Mats, 1948-
(författare)
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Acacia fumosa sp. nov. (Fabaceae) from eastern Ethiopia
- 2008
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Ingår i: Nordic Journal of Botany. - 0107-055X .- 1756-1051. ; 25:5-6, s. 272-274
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Tidskriftsartikel (refereegranskat)abstract
- The new species Acacia fumosa is described and illustrated. It is confined to the Somali National Regional State (Ogaden) in eastern Ethiopia, where it is dominant and widespread on limestone hills in an area of at least 8 000 km2. Acacia fumosa is closely related to A. ochracea in south-western Somalia, but differs, for example, in its ash grey, smooth and non-flaking bark, densely pubescent leaves, and pink flowers.
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| 2. |
- Lidén, Magnus, 1951-
(författare)
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New species, combinations, and records of Hypecoum, Dactylicapnos and Corydalis (Fumariaceae) in China
- 2008
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Ingår i: Nordic Journal of Botany. - 0107-055X .- 1756-1051. ; 25:1-2, s. 1-5
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Tidskriftsartikel (refereegranskat)abstract
- Five new species of Fumariaceae from the Flora of China area, viz. Hypecoum zhukanum (sect. Leptocarpae), Dactylicapnos gaoligongshanensis (sect. Dactylicapnos), D. leiosperma (sect. Minicalcara), Corydalis laxiflora and C. tianshanica (subgenus Cremnocapnos sect. Stricute), are described. Dactylicapnos burmanica comb. nov., D. grandifoliolata and D. macrocapnos are reported from China for the first time, and the new combinations Dactylicapnos ventii (basion.: Dicentra ventii T. C. Khanh), D. schneideri (basion.: Dicentra schneideri Fedde) and D. burmanica (basion.: Dicentra burmanica K. R. Stern) are validated. Novelties in Corydalis subgenus Corydalis will be published separately.
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| 3. |
- Tyler, Torbjörn
(författare)
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On Hieracium incurrens (Asteraceae) and similar species in central Sweden.
- 2007
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Ingår i: Nordic Journal of Botany. - 0107-055X. ; 25:3-4, s. 152-160
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Tidskriftsartikel (refereegranskat)abstract
- Hieracium incurrens Saelan ex Norrl., originally described from Finland, has been reported from Sweden several times and independently by different authors. Still, however, its presence in Sweden has remained dubious and it has become obvious that the different reports are referable to different taxa and the name has thus been, at least partially, misapplied. In the present study, all Swedish material and putative taxa that have been suggested to belong to H. incurrens, as well as some additional closely similar taxa, is critically compared with authentic material of the latter from Finland. It is concluded that H. incurrens do indeed occur in central Sweden, namely in the eastern coastal provinces closest to Finland. However, the relevant material has mostly been referred to H. longilingua Johanss., which is here considered to be a later synonym of H. incurrens. Material previously referred to H. incurrens from other parts of Sweden does, however, represent other taxa. Five accepted species of this affinity are described and discussed in some detail and one species, viz. H. oestmanii T. Tyler is described anew. In addition, the unrelated species H. arnoldii T. Tyler is described anew based on material from the provinces of Hälsingland and Medelpad.
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| 4. |
- Kärnefelt, Ingvar
(författare)
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Editorial
- 2009
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Ingår i: Nordic Journal of Botany. - 0107-055X. ; 25:1, s. 4-4
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Tidskriftsartikel (refereegranskat)abstract
- Abstract is not available
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| 5. |
- Lind, Henrik, et al.
(författare)
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Metapopulation pollination in the deceptive orchid Anacamptis pyramidalis
- 2007
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Ingår i: Nordic Journal of Botany. - 0107-055X .- 1756-1051. ; 25:3-4, s. 176-182
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Tidskriftsartikel (refereegranskat)abstract
- Pollen dispersal between local plant populations within a range of 6 kin in a geographically defined metapopulation of the lepidopteran-pollinated deceptive orchid Anacamptis pyramidalis was studied on the island Oland in the Baltic Sea. Local A. pyramidalis populations were examined for pollinators, flowering individuals, and fruit set. Population sizes of pollen vector species were estimated using a mark-release-recapture technique. As pollen vectors, the burner moth Zygaena minos and the butterfly Aporia crataegi dominated. 205 out of 745 marked lepidopterans were pollinarium carriers. The proportion carriers of the total was considerably higher in Z. minos (50.3%), than in A. crataegi (21.5%) and nymphalidae (8.2%). Furthermore, Z minos moved much shorter distances than A. crataegi did, while no difference in potential pollen dispersal distances were found between males and females. The number of individual vectors recaptured in another local population of A. pyramidalis was low: A. crataegi (8) and Z minos (1). The ratio of pollinaria transferred to another local A. pyramidolis population compared to pollinaria remaining within the same local population was 1:41. This study highlights that pollen dispersal distances vary between pollen vector species.
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| 6. |
- Tyler, Torbjörn
(författare)
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Editorial
- 2007
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Ingår i: Nordic Journal of Botany. - 0107-055X. ; 25:1, s. 3-3
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Tidskriftsartikel (refereegranskat)abstract
- Abstract is not available
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| 7. |
- Tyler, Torbjörn
(författare)
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How complete and correct was Linnaeus’ knowledge and classification of the Swedish flora?
- 2007
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Ingår i: Nordic Journal of Botany. - 0107-055X. ; 25:1-2, s. 7-8
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Tidskriftsartikel (refereegranskat)abstract
- The degree to which Carolus Linnaeus managed to describe the vascular plant species diversity of his native country, and the proportion of his taxonomic decisions concerning the rank and generic classification of these same species that are considered correct by present-day taxonomists, is analyzed by comparing the most recent checklist of the Swedish flora, excluding later immigrants, with the works of Linnaeus. It is concluded that 79% of the species occurring in Sweden by the year 1700 were recognized and accepted by Linnaeus. Of these, ca 74% are still today accepted with the same rank, and are referred to the same genus. Thus, one answer to the current popular question of to what extent 'Linnaeus was right' is: approximately three quarters!
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| 8. |
- Alatalo, Juha, 1966-, et al.
(författare)
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Effect of Altitude on the Sex-Ratio in Populations of Silene Acaulis (Caryophyllaceae) : Effect of Altitude on the Sex-Ratio in Populations of Silene Acaulis (Caryophyllaceae)
- 1995
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Ingår i: Nordic Journal of Botany. - 0107-055X .- 1756-1051. ; 15:3, s. 251-256
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Tidskriftsartikel (refereegranskat)abstract
- Predicted increase of female frequencies in gynodioecious Silene acaulis was tested along an altitude gradient in northern Sweden. Average female frequencies for the four sites increased with altitude from 42% to 59% within a short geographical distance. This follows the outcrossing hypothesis, that female frequencies should be positively correlated with selfing rates of hermaphrodites in populations. More adverse environmental conditions should favour gynodioecy in areas where reproduction to a greater part relies on vegetative reproduction or selfing. Further, a significant difference in corolla width was found between females and the larger hermaphrodites, but not between sites. Cushion size and the number of flowers per cushion decreased with altitude.
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| 9. |
- Alatalo, Juha, 1966-
(författare)
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Gender lability in trioecious Silene acaulis (Caryophyllaceae)
- 1997
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Ingår i: Nordic Journal of Botany. - : Wiley. - 0107-055X .- 1756-1051. ; 17:2, s. 181-183
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Tidskriftsartikel (refereegranskat)abstract
- Gender expression of individual cushions of Silene acaulis was shown to vary between years. Fifteen of thirty-nine (= 38%) cushions monitored changed gender expression between 1993 and 1995. Cushions dominated by female flowers were shown to be more stable in gender expression than cushions dominated by male or hermaphrodite flowers.
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| 10. |
- Alatalo, Juha, 1966-, et al.
(författare)
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Pollen viability and limitation of seed production in a population of the circumpolar cushion plant, Silene acaulis (Caryophyllaceae)
- 2001
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Ingår i: Nordic Journal of Botany. - : Wiley. - 0107-055X .- 1756-1051. ; 21:4, s. 365-372
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Tidskriftsartikel (refereegranskat)abstract
- Pollen viability among genders and limitation of female seed production in a natural trioecious population of the circumpolar cushion plant Silene acaulis was examined. Pollen viability was estimated by an in vitro pollen germination experiment. Both male and hermaphrodite flowers displayed large variation in pollen viability (0-53% in hermaphrodite and 0-54% in male flowers). There was a significant difference between genders in pollen viability: male plants had on average higher pollen viability than hermaphrodite plants. Resource and pollen limitation of seed production was studied by an experiment consisting of three treatments; (I) hand-pollination and removal of all other flowers on the cushion, (II) harid-pollination without removal of other flowers, and (III) open pollination without removal of flowers, Hand-pollination increased seed production, whereas removal of flowers had no effect on seed production. Abortion of pollinated ovules during seed development and seed mass did not differ among treatments. To control for effect of fruit number on seed production, data from naturally pollinated individuals was used. There was a positive correlation between both total number of seeds and fruit number, mean seed number per fruit and fruit number, respectively. These results indicate that seed production of S. acaulis is mainly limited by pollen availability whereas resource competition between fruits is not important as a limiting factor. The possible role of male quality differences between genders and pollen limitation of seed production for maintenance of trioecious reproductive systems is discussed.
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