Potamogeton compressus L. Conservation status: N First record: Ray, 1686 Last record: RS Adamson, 1912 Potamogeton compressum Flat-stalked Pondweed. Relhan,1785. Potam compressum Presented by my friend the Rev. R. Relhan. 1799. [WS] Hort.Sic.2:30,WBCH. conf. CD Preston 1993. P. compressum From Relhan. 1799. Skrim.MS. Potamogeton compressum Flat–stalked Pondweed. Relhan,1820. 45 Potamogeton caule compresso, folio Graminis canini. In fluvio Camo prope Cantabrigiam copiose, a relequis speciebus differt. Ray,1686,1:189. Potamogeton caule compresso, folio Graminis canini 'copiously in the Cam near Cambridge... Ray, Hb Buddle, BM. [Formerly refered to as P. acutifolius; in their unpublished monograph Dandy and Taylor withdraw this reference to P. acutifolius and state that the plant was P. compressus.] Small–branched Pondweed with a flat Stalk. In Cambridge and many other Rivers. Ray,1690,35; Ray,1696,61; Ray,1724,149. In the river Cam, and on it's Banks. Martyn,1763,Herbat.XIII. Cam / Banks Fisher ann. Berkenhout,43. b Queen's Green, &c. Relhan,1802. P. gramineus Cow fen. Relhan,litt.1799. P. gramineus L. Cow Fen. Was not this P. zosterifolius which grows by that place. Bab.MS.Fl.789. P. zosterifolius Cambridge, 1833. JE.Smith, mss. NBG,1835,153. P. zosterifolius Queen's Green [insert douible line] Bab.ann.Relhan,69. P. zosterifolius Queens Ditch. Bab.MS.Fl.788 & Bab.1860,250. P. zosterifolius Sheeps Green. [under P. gram Folio quam in P. compresso latiore, longiora.] Bab.ann.Relhan,69. P. zosterifolius ...River Cam at Sheep's Green, Cambridge. Bab.MS.Fl.788 & Bab.1860,250. P. gramineus L. Is said by Relhan to have been found in Cow fen. Was not this P. zosterifolius which grows close to that place. Bab.1860,250. P. zosterifolius River at Cambridge, n.c., n.d., SWN. Behind Colleges, n.c., 7.1843, det. Dandy & Taylor, SLBI. Cambridge, CC Babington, 13.6.1848, det. Dandy & Taylor, CGE. Went to Saffron Walden to meet Borrer... Newbould returned to Cambridge with us, and we got Potamogeton zosterifolius in the ditch behind Queen's College, and a ditch on the east side of Sheep's Green. 18 July, 1848. Bab.Mem.144. Cam, near Cambridge; Ray. 1860,250. 46 Ditton, Cambridgeshire, Rev Prof Henslow, n.d., det. Dandy & Taylor, CGE. This day Professor Agardt, of Lund, Mr. W. Christy, Mr. Garnons, Stephens, the great entomologist, and Westwood breakfasted with me. We went, under the direction of Henslow, into the fens. We had the conservators' barge. At Baitsbite we found Potamogeton zosterifolius in the ditch leading up to the Horningsea road. 29.6.1833 Bab.Mem.17. Baits Bite, CC Babington, 29.6.1833, det. Dandy & Taylor, CGE. P. cuspidatum Smith River Cam, Ditton, W.L.P.G., 1.7.1835, SWN. P. zosterifolius In great plenty in a ditch at Baitsbite, near Cambridge. CCB. per Rev. GR Leathes d. 1 Jan.1836. Loudon Mag.Nat.Hist.1836, 9:246. P. zosterifolius Baitsbite. Bab.ann.Relhan,69. P. zosterifolius Baitsbite, Cambridge, Mr Power, 1.5.1837, SWN. Power and I went to Baitsbite and gathered Potamogeton zosterifolius... 5.7.1837. Bab.Mem.62. Potam zosterifolius Baitsbite, Hb JA Power, 5.7.1837, det. A Bennett, RTE. Fen Ditton, JA Power, 1837, det. Dandy & Taylor, CLE. P. zosterifolius Baitsbite, 1833. Bab.MS.Fl.788 & Bab.1860,250. Clayhithe, ditch by R. Cam, Rev FJA Hort, 6.8.1849, det. Dandy & Taylor, BM. Clayhythe, Evans,1939. Waterbeach, 'Probably from Waterbeach Joist Fen or Waterbeach Mow fen, pity there is no date...' n.c., Hb SH Bickham, det. Dandy & Taylor, CGE. 56 P. zosterifolius Bottisham Fen, 1829, Hb Dalton, HJW Cat.1293. P. zosterifolius Bottisham Fen, 28.5.1829, J. Dalton! Bennett,1899,246. 57 Stretham fen, H Baber, 6.1839, det. Dandy & Taylor, UCNW. Stretham, Evans,1939. Ely, CC Babington, 5.7.1853, det. Dandy & Taylor, NMW. P. zosterifolius Ely. Bab.MS.Fl.788 & Bab.1860,250. Wicken cut, AF.ann. Wicken, Evans,1939. 58 Roswell Pits, Ely, A Shrubbs, 7.1887, det. Dandy & Taylor, CGE. Roswell Pits, Ely, CE Moss, Hb ES Marshall, 19.7.1909, det. Dandy, CGE. cf Watson BEC Rep. (1910),2:262. Roswell Pits, Ely, EW Hunnybun, 27.7.1909, det. Dandy & Taylor, CGE. Roswell Pits, Ely, RS Adamson, 29.7.1912, det. Dandy & Taylor, Dandy's Card index, BM, but spec. referred to not found by CD Preston in 1983.
