TOPOGRAPHICAL BOTANY OF SCOTLAND 171 



Scheuchzeria palustris, Z., 88 (apparently now extinct). 

 Potamogeton natans, Z., all. 



var. lanceolatus, Fieber, 109, 111. 

 P. polygonifolius, Pour., all. 



var. angustifolius, Fr., 109, 112 (approaching this var.) 

 P. coloratus, Hornem. ( P. plantagineus, Du Croz), 72, 79-82, 100, 

 ii2(?), [98 and 109 have been also recorded for this, but 

 probably erroneously]. 

 P. alpinus, Balb. ( = P. rufescens, Schrad.}, except 79. 80, 91, 95, 96, 



98, 104, 105, 107, 108, 110, 111, 112. 



[P. lanceolatus, Sin., has been recorded from 72 and 73, but in 



error, the plant being P. nitens.~\ 

 P. heterophyllus, Schreb., except 80, 82, 84, 97, 99, 107. 



var. c. graminifolius, Fr., 109. 

 P. nitens, Web., 72, 73, 80, 85, 86, 88-90, 92, 93, 95, 96, 98, 100, 



102, 103, io5(?), 106, 108, 109, in, 112. 

 P. lucens, Z., 72, 75, 79-81, 83, 85-94, 98, 104, io8(?), no(?), 



in [112, ? error]. 



P. decipiens, Nolte, 80, Si, 86, 88, 90, 102. 

 P. angustifolius, PresL ( P. Zizii, Roth.), 72-74, 77, 79-81, 86-90, 



99, 106. 



P. praelongus, Wulf., 73, 74, 75 (?), 80, Si, 83 (?), 85, 86, 88-90, 



92, 95 (?), 96-98, 102-104, 106, 108, 109, 112. 

 P. perfoliatus, Z., except 78, 82, 101, 105. 



var. b. lanceolatus, Blytt, 86, Sutherland, 112. 

 P. crispus, Z., except 87 (?), 96, 97, 98, 103, 104, 105, 107, 108, 

 112(?). 



var. b. serratus, Huds., is reported in " Fl. Perth," p. 311, as 



" in several places in Perthshire." 

 P. densus, Z., 77, So, 82, 83. 

 P. zostersefolius, Schum., 85 (?), 86, 89 (?), 90. 

 P. Bennettii, Fryer, 86. 



P. obtusifolius, Mert. and Koch, 72, 73, 75, 77, 79-81, [83], 85-92, 

 96, [in]. 



var. b. fluvialis, Lange and Mort., is the " common form in 



Perthshire." 

 P. Friesii, Rupr. ( = P. compressus, Sm.), 73, 75, 77, 79 (?), 85, 86, 



90, 99, no, in. 



P. pusillus, Z., except 78, 104, 105, 107, 108. 

 var. b. tenuissimus, Koch, 88, 109. 

 var. c. rigidus, Ar. Benn., 111, 112. 

 P. Sturrockii, Ar. Benn., 86, 89. 

 P. pectinatus, Z., except 76, 77, 78, 79, 82, 88, 89, 91, 94, 97, 98, 



99, 100, 101, 104, 105, 107. 



P. interruptus, Kit. ( = P. flabellatus, Bab.), 75, 80, 81, 83, 95, 99, 

 in. 



