Abstract
THE only published count of the chromosome number of Rorippa sylvestris (L.) Besser (= Nasturtium sylvestre (L.)R.Br.) appears to be that of Manton1, who found 2n = 32. In a search for the other parent species which, with Nasturtium officinale, has given rise to the allotetraploid species N. uniseriatum2, I studied a specimen of R. sylvestris obtained from the Newry canal at Newry (border of Co. Down and Co. Armagh, N. Ireland) and found this plant to have a chromosome number of n = 24 and 2n = 48. Similarly, specimens of R. sylvestris from Horton-in-Ribblesdale (Yorkshire) and from the Botanic Gardens at Cambridge and Kew (the plant was growing as a weed in both gardens) were all found to have a chromosome number of n = 24. There thus seems no doubt that British specimens of R. sylvestris have a chromosome number of 2n = 48 and not 2n = 32 as reported by Manton.
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References
Manton, I., Ann. Bot., 46, 509 (1932).
Howard, H. W., and Manton, I., Ann. Bot., n.s. 10, 1 (1946).
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HOWARD, H. Chromosome Number of Rorippa (Nasturtium) sylvestris. Nature 158, 666 (1946). https://doi.org/10.1038/158666a0
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DOI: https://doi.org/10.1038/158666a0
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