210 



Saxifraga rivularis L. 



Lange, Conspectus, pp. 61 , 256. Rosenvixge. p. 67'.(. Warming, 

 1886, p. 7, figs. 21— 22. Lindman, p. 57, pi. Il, fig. 22. N. Hartz, 

 1894, p. 37; 1895, p. 288. Jungner, p. 275. Ekstam. 1898, p. 17 

 (Spitzbergen). Abromeit, pt 34. G. Andersson och Hesselmak, p. 29. 

 DcsK», p. 33. Lindmark, p. 55, pi. Ill, figs. 8 — 14. Simmons, p. 76. 

 Stlvén, p. 233. 



Knuth, p. 449. 



PWmw/a-type, combined with runners and bulbs. The spe- 

 cies has a very abbreviated, vertical rhizome with short inter- 

 nodes and many slender adventitious roots (Figs. 21 A; 28^1; 

 when growing in damp moss the internodes become fairly 

 elongated (Fig. 28 C); the rhizome dies away at the hinder end. 

 At the base it bears sometimes several, sometimes a few dead 

 leaves; and above these, a rosette of fresh, long-stalked foliage- 

 leaves, which are palmately-reniform, 5 — 7 lobed, and set with 

 glandular hairs (Fig. 27 ^4, D,; Fig. 28 ^). 



Runners. From the axils of the basal leaves may be 

 seen to arise (as many as 5) pale, slender, horizontally- growing 

 runners having on them glandular hairs (Fig. 27 E). They 

 may attain a length of 6 cm., and generally bear scale-leaves 

 which are sometimes succulent and may have small laminae 

 at their apices. The runners ultimately bend upwards, pro- 

 ducing foliage-leaves and forming roots, and a new vertical 

 rhizome arises (Fig. 27^). The runners soon die. In some 

 cases they are seen to be bent even somewhat downwards. 

 Sometimes they bear foliage-leaves only. They may branch and 

 form new runners. 



Bulbils are also formed; they consist of a few, thick 

 scale-leaves, which represent, in the main, the sheath of the 

 foliage-leaves (Fig. 21 B: Fig. 28 B). The bulbils are formed 

 in the leaf-axils of the rhizome simultaneously with, and in 

 immediate proximity to, the runners (Fig. 27 C). According to 

 Lindmark. who is a very careful observer and whose paper con- 



