124 
BRISTOL FIELD-BOTANY IN 1901. 
detailed and connected account of what has been accom- 
plished, especially as the issue of a second edition of the 
Flora may unavoidably be deferred for a considerable time. 
EANUNCULACEiE. 
Thalictrum,. There is scarcely any doubt that the several 
forms of T. mimis L. found in Cheddar Gorge abundantly, and 
very sparingly at Clifton, and to which at various times the 
names of montanum, flexuosum, Kochii and saxatilis have 
been given, are really one segregate, for which T. collinum 
Wallr. is the oldest and most fitting name. Individual speci- 
mens often differ much in appearance, but these variations 
probably depend on situation and the influence of surrounding 
conditions. Two plants only are known to exist at Clifton. 
I saw them in 1884, 1897, and again in May, 1901. They were 
not flowering on the last two occasions. The common 
Meadow-Eue of the district is T. sfhwrocarfum Lej., but a 
second variety with narrow fruit [T. rifarium Jord.) is now 
known to grow on the peat-moor at Burtle and Edington. 
Ranunculus. The study of our Water Crowfoots (Batrachia) 
— so plentiful in ditches draining the lowlands adjacent to the 
Severn Sea — has been carried much farther, but it is still 
difficult to determine some plants of this group with certainty. 
To me the most troublesome problem is to find characters by 
which to separate floribundus from heterophyllus. At present 
I meet with plants that can be referred to either with equal 
hesitation. However, as a general rule, these aquatics, if in 
good condition, can readily be assigned to their respective 
places. R. tricofhyllus is frequent and well marked, and the 
same may be said of R. Drouetii, though it is not so common. 
Good examples of the latter can always be found in ditches 
between Shirehampton and Avonmouth. A form of hetero- 
fhyllus with floating leaves coriaceous in texture, hairy be- 
neath, and divided deeply into straight-sided wedge-shaped seg- 
