78 1 RANUNCULACE^. 



Castletown, in Aberdeenshire ; and on account of that lo- 

 cality the range of temperature is earned down to 43 de- 

 grees, and that of altitude up to 350 yards. 



-I 

 ll,c. Ranunculus/'peucedanifolius, J/L/ ^ l^^-^f/. ^,^/ 



Ai-ea i 2 3 4 5 ^ 7 8 * 10 * * * 14. 



South limit in ? 



North limit in Edinbiu:gh and ? 



Estimate of provinces 14. Estimate of counties 50. 



Latitude 50 — 56. English tj^je of distribution. 



Agrarian region. Inferagraxian — Midagi-arian zones. 



Descends to the coast level, in the Channel. 



Ascends to 100 or 200 yards, in England. • 



Range of mean annual temperatm-e 51 — 47. 



Native. Lacustral. Inhabits streams, but is " not con- 

 fined to running water," (Bab. Man.). Probably distri- 

 buted throughout England and some part of Scotland ; but 

 having been frequently confomided with slighter vaiieties 

 of R. aquatilis, equally called fluitans or fluviatilis, its tme 

 distribution cannot be determined at present. I follow De 

 Candolle, Steudel and other continental authorities, in re- 

 fei-ring the R. fluitans (properly so named) of English wii- 

 ters to the R. peucedanifolius of the Flora Pedemontana. 

 I kept a root of this plant in a small pan of water, eight 

 inches in diameter, near two years. It produced no flowers, 

 but continued to vegetate, and re-supply the loss of branches 

 which sloughed away or were destroyed. The leaves be- 

 come gradually shorter ; those last produced being tripartite 

 or temate, the segments only half an inch long and about 

 the eighth of an inch broad. The plant perished during 

 the hot weather of June 1846. I still feel in doubt whether 

 to hold it as a species or as a persistent variety. 



