1909-10.] Flora of Scottish Lakes. 73 



. mersed plant growing at the margin of lochs and in slow streams, in 

 water 6 to 24 inches deep. The floating stem, 12 to 30 inches long, 

 has at every node elongated roots and a fascicle of leaves. The 

 radical leaves are few, and have a slender petiole 3 to 8 inches long, 

 with a small entire ovate or elliptical lamina h inch to 1 inch 

 long. The stem leaves are similar to the radical ones, but smaller, 

 more linear, and float more or less upon the surface. No specimens 

 were found in either flower or fruit, perhaps owing to the lateness of 

 the season (September). The whole plant is weak and flaccid when 

 withdrawn from the water. It is very abundant in the neighbour- 

 hood of Lochs Recar, Ballochling, etc. It cannot, therefore, be 

 treated as a mere " sport," but rather as an aquatic form of 

 R. Flammula. From this aspect it is most interesting, as it presents 

 a case of an acjuatic plant derived from a common semi-aquatic 

 or almost terrestrial progenitor, and the form from Tents Muir 

 may be considered as an intermediate stage in the evolutionary 

 process. 



Caltha palustris, L. "I., II., III.," IV., V., VI., VII. An abundant 

 plant about lowland lochs, especially in Area VII. 



Caltha palustris, L., var. minor, Syme. " I.," IV. About the hill lochs, 

 see remarks a7it€, p. 971. 



NYMPH.'EACE.^. 



Castalia speciosa, Salisb. { = C. alba, Wood). "I., II.," IV., V., VI., VII. 



Very common and abundant, especially where the water is not very 



peaty (flg.s. 21, 61, 86, 87, etc.). 

 Castalia speciosa, Salisb., var. minor (DC). "I.," IV. Less abundant 



than in Area I. ; see remarks ante, p. 971. 

 Nymphaea lutea, Z. " II.," IV., V., VI., VII. Common and abundant, 



often overgrowing large areas, but seldom seen in the hill lochs (figs. 



31, 87, etc.). 

 Nymphsea lutea, L., var. intermedia (Ledeb.). IV., VII. Grows with 



the larger form, and sometimes alone, particularly in the lower 



portion of L. Ken, where it is very abundant. Rather rare in 



Area VII. 

 Nymphsea pumila, /fo^'ju. "I.," IV. Not common ; chiefly in L. Ken 



and L. Stroan. 



plus grande, nageant a la surface de I'eau, dont toutes les feuilles soiit entieres, les in- 

 ft'rieures ovales, obtuses, portees sur de tres-longs petioles ; les .superieures etroites, 

 lineaires, aigues ; les pedoncules presqu'uniflores" {Lam. Encyc, vol. vi. (1804), pp. 98-99). 



