snow. In full flower at the end of July. The specimens collected are large and luxuriant, 

 the stems to 18 cm. high, w ith 1 to 3 cauline leaves, the breadth of the basal leaves to 

 3,5 cm., the flower from 2 to 2,5 cm. in diameter. 



Distribution: Arctic Europe, arctic and alpine portions of Siberia, northern Mongo- 

 lia, the Thian-Shan, North America. 



Ranunculus radicans C. A. Meyer in Ledeb. Fl. .\lt. II, p. 316; Turczan. Cat. Baical. 

 no. 36; Ledeb. Fl. Ross. I, p. 34; Turczan. Fl. Baical.-Dahur. (1842) p. 52, no. 35; Regel, 

 PI. Radd. (1861) p. 44; Kpu.T. i\i. Ajit. I (1901) p. 25. Ranunculus Pnrschii Hooker, Fl. 

 Bor. Amer. I, p. 15; Ledeb. Fl. Ross. I, p. 35; Turczan. Fl. Baical.-Dahur. (1842) p. 54, 

 no. 38. 



subspec. niultifidus Pursch. Regel, PI. Radd. (1861) p. 45; KpLo. 1. c. p. 26. Ranun- 

 culus Pnrschii a aquatilis a et b, Ledeb.- Fl. Ross. I, p. 35. 



There are only a few, rather defective specimens in my collection, taken in a pool 

 in a peat-bog, near Ust Algiac, on the right bank of the river Sisti-kem, where associated 

 with various species of Sphagnum, Carex limosa, and Carex magellanica. The leaves in 

 the specimens collected are palmately divided into 3—5 segments, and each one general- 

 Iv divided into capillary sections. The outline of the leaves is nearly reniform, from 7 

 to 9 mm. broad, and the sections 0,5 to 1 mm. broad. The jjetals are, during tlie 

 flowering, rather much I'eflexed. narrowly elliptic to broadly lanceolate, from 1,5 to 2 

 mm. broad, and from 3,5 to 4 mm. long. Floating leaves are wanting. Taken in full 

 flower at the beginning of August. 



Distribution: North-eastern Russia, the Thian-Shan, Siberia, northern Mongolia 

 (the Altai and Sayansk mountains). North America. 



Ranunculus subsimilis nov. spec. [Tab. VI, Fig. 1]. 



In Asia, the so-called Ranunculus Ciimbalaria Pursch is recorded to be distri- 

 buted from Persia through Turkestan and southern Siberia to Kamtchatka. the Hima- 

 layas and India. I have also collected a rather rich material from the Minusinsk district. 

 By comparing my material with the drawing of tlie species found in Britton and Brown 

 An Illustr. Flora of Northern United States and Canada, Vol. II (1897) p. 86, I disco- 

 vered at once a striking difference in the structure of the leaves. Prof. dr. N. Wille 

 has most obligingly given me an opportunity of comparing the rather rich material of 

 this species from various places in Siberia and America belonging to the Botanical 

 Museum of the University at Christiania. In the material thus brought together I have 

 been able to point out a marked difference between the Siberian specimens and the 

 American ones in the structure of the leaves, which will also appear distinctly from the 

 annexed figure 88. In the three upper rows I have grouped and reproduced in natural 

 size leaves of the typical Ranunculus Cijmbalaria Pursch, in the three lower ones leaves 

 of Siberian specimens. The American specimens will be seen to be distinguished by 

 having the leaves cordate-ovate to orbicular-reniform, with a broad, rounded summit, and 

 with a distinct, cordiform incision at the base. The indentations of the loaves are 



236 



