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  • 1
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    Chromosome numbers in the series Rupestria berger of the genus Sedum L (1972)
    In:  Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht (2352-5754) vol.376A (1972) nr.1 p.428
    Details
    Publication Date: 2015-05-08
    Description: In the series Rupestria Berger the following chromosome numbers were found: Sedum forsterianum Sm., 2n = 48 and 96; Sedum montanum Song. & Perr., 2n = 34 and 51; Sedum ochroleucum Chaix in Vill., 2n = 34 and 68; Sedum reflexum L., 2n = 85, 102, and 153; Sedum sediforme (Jacq.) Pau, 2n = 32, 64, and 96; Sedum tenuifolium (Sibth. & Sm.) Strobl, 2n = 24 and 72. The author is of the opinion that for the present all these taxa should be treated as separate species.
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
    Format: application/pdf
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  • 2
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    Sedum tenuifolium (Sibth. & Sm.) Strobl subsp. ibericum nov. ssp (1974)
    In:  Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht (2352-5754) vol.411 (1974) nr.1 p.549
    Details
    Publication Date: 2015-05-08
    Description: Within Sedum tenuifolium (Sibth. & Sm.) Strobl two morphologically distinct forms can be recognised. These forms, characterised by the presence of long-stalked and short-stalked propagules, respectively, have different areas. The diploid of S. tenuifolium belongs to the shortstalked form, the hexaploid to the long-stalked form. The short-stalked form is newly described as ssp. ibericum, the name referring to its main area.
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 3
    Electronic Resource
    Electronic Resource
    The evolution of crassulacean acid metabolism inAeonium inferred from carbon isotope composition and enzyme activities (1992)
    Springer
    Oecologia 91 (1992), S. 548-553 
    Details
    ISSN: 1432-1939
    Keywords: Aeonium ; Crassulacean acid metabolism ; δ13C ; Phosphoenolpyruvate carboxylase ; Malic enzyme
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Variation in crassulacean acid metabolism (CAM) was investigated in thirtyAeonium species under controlled, well-watered conditions. Carbon isotope ratios and the specific activities of the CAM enzymes phosphoenolpyruvate carboxylase (PEPC) and malic enzyme ME_ are highly correlated and indicate a large variation in CAM. The δ13C values range from -13.6 to -27.1‰; PEPC and ME activities vary seven- and five-fold, respectively. Since these observations were made under controlled conditions, the differences are genetically determined and represent adaptations to different habitats. The CAM activity of the species is correlated with the characteristics of their natural habitats. CAM activity is also highly correlated with the growth- and life-forms of the species and accordingly agrees well with the infrageneric classifications which are partly based on these characters. Our results support the hypothesis that the Sempervivoideae have evolved from an EurasiaticSedum, which used C3 photosynthesis or weak CAM, and that evolution withinAeonium was from undifferentiatedSedum-like dwarf shrubs with C3 photosynthesis to woody candelabrum-shaped shrubs exhibiting strong CAM. The monocarpic, rosulate species with intermediate CAM may have evolved via an independent secondary route.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650330
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  • 4
    Electronic Resource
    Electronic Resource
    The allopolyploid origin ofSedum rupestre subsp.rupestre (Crassulaceae) (1993)
    Springer
    Plant systematics and evolution 184 (1993), S. 195-206 
    Details
    ISSN: 1615-6110
    Keywords: Crassulaceae ; Sedum rupestre ; Chromosome numbers ; hybridization ; allopolyploidy ; chloroplast DNA RFLP ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract InSedum rupestre L. a polyploid series (x = 16) occurs in which aneuploid chromosome numbers and odd levels of ploidy prevail. The most common and widely distributed cytotype,S. rupestre subsp.rupestre, is 2n = 112. Plants resemblingS. rupestre subsp.rupestre can be obtained by hybridizing the tetraploid cytotypes ofS. forsterianum Sm. (2n = 48) andS. rupestre subsp.erectum 't Hart (2n = 64). Comparison of these artificial hybrids with their parents and a large number of plants ofS. rupestre subsp.rupestre (2n = 112) from nature showed thatS. rupestre subsp.rupestre and the artificial hybrids are morphologically indistinguishable, and intermediate betweenS. forsterianum andS. rupestre subsp.erectum. MorphologicallyS. rupestre subsp.rupestre is closer to subsp.erectum than toS. forsterianum. Chloroplast DNA restriction patterns ofS. rupestre subsp.rupestre, however, resembleS. forsterianum more closely. The combined results of the hybridization experiments, the analysis of the cpDNA restriction patterns, and the morphological variation indicate the allopolyploid origin ofS. rupestre subsp.rupestre.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937435
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  • 5
    Electronic Resource
    Electronic Resource
    Ornamentation of the testa inSedum (Crassulaceae) (1980)
    Springer
    Plant systematics and evolution 135 (1980), S. 107-117 
    Details
    ISSN: 1615-6110
    Keywords: Crassulaceae ; Sedum ; Seed ; testa ornamentation and ontogeny ; SEM ; infrageneric classification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A SEM investigation of the seeds of 40 European and 5 Asiatic species ofSedum revealed three fundamentally different types of ornamentation of the testa. The most prominent difference in the ontogeny of the seeds differing in ornamentation is the ovular envelope, which is a mucous membrane enclosing the ovules and young seeds and occurring only in plants whose seeds have a simple type of ornamentation. The ornamentation of the testa was found to be a very constant character. Because the ornamentation is highly correlated with the hybridization pattern of the species it is considered to be an important character in the infrageneric classification ofSedum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00983011
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