1918-19.] BOTANICAL SOCIETY OF EDINBUllGH 813 



Ledeboiir, Fl. Russ., iv, 27 (1853). 



Gren. et Godr., Fl. Fr., iii, 315 (1855). 



Miihlein et Kupfer, Korresp. d. Nat. Ver. Riga, -46. 161 

 (1906). 



Richter (PL Europe, i, 14, 1S90) following Ledebour, I.e., 

 refers P. salicifolius, Wolfg., I.e., and I^. lanceolatus, Eichw., 

 Nat. Skizze Lith., 126, 1880, to longifolius, but I think 

 this is not correct. 



The first description is that of De Candolle, who remarks : 

 " M. Guersent a trouve cette variete dans la riviere de 

 Bapaume ; elle est reuiarc^uable pour la longueur extra- 

 ordinaire de ses feuilles, elles ont jusqua un pied de 

 longueur sur 8-9 lignes de largeur, et se terminent en 

 pointe allongee pas les deux extreraites." That of M. Gay 

 is: "P. foliis oblongo-lanceolatis, utrinque acutis, subses- 

 silis, pedunculis, longitudine foliosus : spica longa, tereti." 

 Distribution : France !, Lithuania 1, Baltic provinces of 

 Russia, Asia, Sherard. herbarium at Oxford 1, Africa 1 

 Those so named from Sweden by Dr. Tiselius are rather 

 a long-leaved form of lucens. The same occurs in Orkney 

 (Johnston !). The Swiss record is also an error, teste Dr. 

 Schroter. The specimens so named from Siberia (Herb, 

 petrop.) are the same as Tiselius', and would come under 

 his name of /'. insigne. The Grand Junction Canal at 

 Market Hai'boro', Leicestershire, Mr. Geo. Chester, 1916. 



The leaves in the British specimens are 2-3 dm. long x 

 2 cm. wide (the Lithuanian specimens vary from 1-50- 

 3*20 dm. X 2 cm.). Leaves darker in colour than lucens, 

 and almost throughout their length parallel-sided. The 

 colour is -darkest in Wolfgang's specimens, lightest in 

 Besser's, while those of Gorski come between. In the 

 Vienna herbarium Wolfgang has a specimen "P. niacro- 

 phyllus mihi Tab. 16." This refers to a MS. Monograph 

 of the genus in the Library of the Moscow Soc. Imp. 

 Naturalists. He also with Besser published manj^ dried 

 specimens of the genus. In P. longifolius we have a plant 

 that has gradually descended from a species to a sub-var. 

 in Das Pflanzenreich (1907) by Graebner, but in 1918 the 

 same author makes it a variety, quoting Cham, et Schlecht. 

 in Linn., ii, 198 (1827), but they merely say " /. longifolia." 

 Dr. Hagstrom (in litt.) places much reliance on the serra- 



