174 THE JOURNAL OF BOTANY 



between acutifolius and the f. angustissimus of P. zosterifolius 

 Schum. They have the "look" of a North American species, but 

 I know none to which they can be referred : they have the nerva- 

 tion of the pusillus series. In 1883 I gathered in a ditch at Acle, 

 near Yarmouth, East Norfolk, a form of pusillus that connects this 

 Stirling plant with the type. A still nearer approach to it are 

 specimens gathered by Mr. C. E. Salmon in a ditch near Camber 

 Castle, East Sussex, in 1900 ; but these are not so far away from 

 the normal pusillus as the Stirling plant. After remaining in doubt 

 for some years I propose to name them as above. 



Differs from typical pusillus by being larger in all its parts, by 

 the long linear acuminate leaves, the stem more compressed. 



6. P. pectinatus L. var. salina Voch. P. pectinatus L. var. 

 pseudomarinus Ar. Benn. in Trans. Norf. & Norw. Nat. Hist. Soc. 



381 (1882). 



fill for mis. I 



have it under that name (or rather marinus) from Hungary, Bo- 

 hemia, &c. In Watson's herbarium it is called " a maritime variety 

 of P. pectinatus " by the Rev, K. Trimmer. It seems to be the form 

 that pectinatus usually assumes in saline districts in Europe and 

 Asia, whence I have it gathered by Potanin in North China, and 

 Przewalski in West Mongolia. Fries (Nov. Fl. Suec. ed. ii. 53 

 (1828) ) describes a var. /? submari?ius, which may be this plant. I 

 have not been able to see a specimen named by Fries, but have seen 

 one with Voch's name attached, which is certainly the same. 



7. P. intermedius Tiselius, Sveriges Flora, 797 (1901), ex Hag- 

 strom in Neuman & Ahlfv. In the year 1875 Dr. Bosweli Syme 

 gathered in Kirbister Lock, Orphir, Orkney, a series of puzzling 

 plants, which on a scrap of paper placed with them he has named 

 4< P. heterophyllus" No doubt they approach closely to that plant, 

 especially in the fruit, yet they are not like any other Scottish 

 heterophyllus or nitens. The growth of the young plant and the 

 fascicles of curved leaves in the leaf-axils are very like nitens. Of 

 specimens sent to Dr. Tiselius, he said : " I believe it rather to be 

 P. gramineus. It surely looks like my intermedius." The specimens 

 vary considerably among themselves. The plant produces floating 

 leaves on long peduncles. I have a similar plant from Lock of 

 Banles, Birsay, Orkney, J. W. H. Traill, 1888. It may be called 



P. heterophyllus Schreb. var. intermedius. 



8. In the year 1882 the late Mr. Sturrock, of Battray, sent me 

 specimens from the Lunan Burn, and from a loch near, that I have 

 never been able to name. The plants need studying in situ, but so 

 far as dried specimens allow one to judge, they come near to a rare 

 hybrid named x P. Lundii by Richter (PL Europe, i. 13 (1890) ), 

 and considered by Almquist* to be "P. graminea X pralonga" and 

 found in Smaland, Sweden. It seems impossible to doubt that 

 pralongus is represented in them, especially in the lower leaves and 

 stipules, while in the barren shoots heterophyllus seems apparent. 

 The flowers all seem imperfect, mostly closed, and so lend them- 

 selves to hybridity, but they should be grown and watched. 



See Hartm. Skand. FL ed. 12, 49. 



