— 133 — 



barier; der maa sikkert Iagttagelser til ude i Naturen. Imidlertid 

 taler der til Fordel for dens Rigtighed foruden de rent morfologiske 

 Karakterer tillige den geografiske Udbredelse. Vi vilde derved faa 

 en s am mmenhængende Forekomst af Oe. fluviatilis i Vest- 

 Europa fra Jylland over Holsten til Belgien og Rhin- 

 landene og endvidere paa de Britiske Øer. Det vilde 

 være ønskeligt, om Botanikere i Tyskland vilde tage sig af Løs- 

 ningen af dette Spørgsmaal. 



Botanisk Museum, København. 20.— 12.— 12. 



Abstract. 



Some Remarks on Oenanthe aquatica, Oe. fluviatilis and Oe. conioides, 



The submerged stage of Oe. fluviatilis is recorded for the first 

 time as found in Denmark; the localities are two rivers in the western 

 part of Jutland (Linding Aa and Varde Aa). Hitherto this species 

 has been known only from the British Isles and in Elsass and Baden. 



The distinction marks between Oe. aquatica and Oe. fluviatilis 

 are discussed. It is shown that sometimes also Oe. aquat. produces 

 propagation shoots, thus being a perennial plant — at least when 

 growing in water. But more detailed studies on the manner of pro- 

 ducing these shoots are necessary. 



It is supposed that the records, in several floras of Central- 

 Europe, of runners in Oe. aquat. are to be explained by their com- 

 bining Oe. aq. with Oe. fluv. into one species. Further researches 

 will probably succeed in finding Oe. fluviatilis in the countries 

 between Jutland and Baden. A closely related plant, Oe. conioides 

 (Nolte ms.) Lange, only known from the Elbe around Hamburg, may 

 perhaps be the land-stage of Oe. fluviatilis, as its characters agree 

 with it ; but it is remarkable that it has not been found with sub- 

 merged leaves. 



