The flowers often do not open at all, the perianthium 

 is a little broader than long, the tip bent inwards and with 

 a dilation or a hunch outside at the basis. 



It has 4 stamens with sessile anthers — which according 

 to G as par y only produces sterile pollen — 4 pistils, the 

 thick, outward bent styles of which have discoidal, flattened 

 stigmas. 



Ripe fruit has not been found. 



This interesting plant seems to have been noticed only 

 seldom, and so it may be of importance to see, how it has 

 been understood in the literature. 



The first description of it is found in Wolfgang's manu- 

 script monography of the Potamogeton Genus, a work which 

 according to „ Florae Rossicae fontes" by Trautvetter p. 329 

 is found in the library of the Société des Naturalistes de 

 Moscou. Besser sent a copy of this description to the editors 

 of „Mantissa in volumen tertium systematis vegetabilium 

 Garoli a Linné". In this work is read p. 360. Nr. 21a. 1827. 



„Gaule compresso, sulco utrinque longitudinali, fluctuante, 

 inferne ramoso , foliis omnibus submersis , membranaceis, 

 integerrimis , alternis, oblongo-ovalis , apice planms am- 

 piexicaulibus, stipulis truncatis, complanatis, cauli adpres- 

 sis Wolfg. Ms. No. 22. Besser in litt." 

 „Differt a P. crispo foliis longioribus, majoribus, integerri- 

 mis (nec crispatis, nec serrulatis) colore atroviridi et venis 

 non convergentibus sed transversim reticulato striatis 

 Wolfg." 



To these descriptions Roemer and Schultes add. 1. c. : 

 „In specim. nostro flores desunt, folia 4— 5-poll. V2— Vs 

 poll, lata, majora quam in crispo, quidquam undulata, 

 5—7 nervia, nervis 3 fortioribus. Maxime sane affinis 

 P. crispo." 



In „Journal of Botany", vol. 29, 1891, p. 290 Mr. A. Fry er 

 writes, that Roemer and Schultes consider the plant a 



