22 TRANSACTIONS OF THE [Sess. lxxvi. 



and slow streams in water 6 to 24 inches deep. Abundant 

 in Lochs Recar, Ballochling, etc. (Kirkcudbright). Persoon 

 describes this as " y natans, fol. inferiorib. ovatis integris, 

 superioribus linearibus," " Syn.," pi. v., ii. (1807), p. 102. 

 Recorded from the same place by Lamarck in " Ency. 

 Meth. ," v., vi. (1804), p. 98, but given no name. 1 



2. Ranunculus lingua, L. — The early submerged leaves 

 of this species, first called attention to by the late Mr. 

 Roper, 2 are so unlike the flowering stage leaves that unless 

 one had watched the plants it could hardly be believed ; 

 they are 8 to 9 inches long by 3 inches wide, and in those 

 I watched were quite decayed when the plant flowered. 



3. Peplis Portula, L. — Mr. West found an entirely sub- 

 merged form in Loch Doon (50 to 100 feet deep), Ayr, 

 " growing to a length of 3 feet with larger, thinner, semi- 

 pellucid leaves, stems weak." This is quite beyond any- 

 thing I have seen ; I have gathered it in Surrey (submerged) 

 13 inches long only. 



4. Hydrocotyle vulgaris, L. — Usually a creeping species 

 among higher vegetation in wet or damp places, but in 

 Barlockhart Loch, "Wigtownshire, Mr. West gathered a 

 " floating form having stems 30 to 50 inches long, with 

 leaves only \ inch in diameter and very thin." 



5. Apium inundatum, H. G. Reichb. — This species 

 varies considerably as to depth of submerged forms. I 

 have seen it in water 2 feet deep. Mr. West records it 

 " in water from 3 feet to 6 feet deep, reaching the surface 

 from even the greatest depth." In Engler's " Bot. 

 Jahrbiicher," 3 Dr. Gliick throws these various semi- 

 aquatics into groups under three series (p. 104) — 



(1) Die submerse Flora, 



(2) Die Schwimmblattftora, 



(3) Die Uferflora, 



placing these species with " Sium latifolium, (Enanthe 

 fistulosa, (E. fluitans, Littorella laeustris, etc." 



Mr. West (2) remarks : " In some places, where the water 

 has retreated, the seedlings grow so thick as to cover the 



1 Mr. Ewing's natans, "Ann. Scot. Nat. Hist.," p. 237, 1894, seems 

 different from above. 



2 "Jour. Linn. Soc," xxi. (1886), p. 380. 



3 "tJber die Lebensweise der Uferflora," Beibl. 99, 1909, pp. 104-119. 



