1904 - 5 .] 
Flora of Scottish Lakes. 
977 
high, leaves with very obscure septa and slightly channelled, 
flowering, not often viviparous ; such represent J. supinus, 
Moench. Another form, more csespitose and dwarfed, with 
finer leaves, in wetter situations, flowering, not often vivi- 
parous, may he regarded as var. uliginosus. Then we have 
a prostrate form resembling supinus in size hut with finer 
leaves, inflorescences more abundant, and in whorls, often 
viviparous ; this may be taken as var. subverticillatus. 
Then we have the half - submerged forms with abortive 
flowers and hair-like leaves from which we recognise the 
submerged form with tresses of hair-like leaves, and non- 
flowering ; var. fluitans. This latter form is extremely 
abundant in nearly all the waters of Area I., from the 
highest mountain loch to L. Ness. The other varieties 
are all scarce. These forms are of extreme interest; in 
them we seem to be able to trace the phylogenesis of an 
extremely abundant and dominant aquatic plant : from 
plastic terrestrial and sub-aquatic forms ; not now dominant 
nor abundant in this district. 
TYPHACEiE. 
Typha latifolia, L. III. Only observed at Lochs Loy and 
Cran. 
Sparganium ramosum, Huds. I. Scarce. III. Abundant. 
Sparganium ramosum, Huds., var. neglectum, Beeby. II. Not 
abundant. 
Sparganium natans, L., app. S. simplex, Huds. I. About 
lowland lochs ; not abundant. 
Sparganium natans, L. I. General, chiefly lowland lochs. 
Sparganium minimum, Fries , very small terrestrial form 
on mud. I. Hill lochs; scarce; aquatic forms abound in 
the water near these. 
Sparganium minimum, Fries. I. Abundant in all waters, 
even in the highest mountain lochs. Often not flowering, 
in which state its floating leaves may easily be mistaken at 
a distance for those of aquatic forms of Glyceria fluitans, 
R. Br. The remarks to Juncus supinus apply similarly to 
Sparganium. I am of the opinion that S. minimum 
PKOC. ROY. SOC. EDIN. — VOL. XXV. 62 
