222 



Saxifraga tricuspidata Retz. 



Lange, Conspectus, p. 63. Rosenvinge, 1892, p. 679. Warming, 

 1886, p. 22, fig. 26. Abromeit, 1899, p. 35, pi. V, fig. 3. Günt- 

 HART, 1902, p. 75. Simmons, 1906, p. 66. 



Material in alcohol, and observations on living plants from 

 West Greenland (Godhavn, Godthaab, Upernivik and Holstensborg) 

 by Rosenvinge, Warming, Th. Holm and С Ryder. 



This plant has a tendency to become a sub-shrub. The 

 ascending stems may attain a length of as much as 15 — 20 cm. 



Fig. 34. Saxifraga tricibspidata. 



A, From Upernivik (May 10, 1887; C. Ryder), from a spot bare of snow (about nat. size)]; 



i,i, two old inflorescences. B, From West Greenland (July 11, 1884); t, floral stem. UK, 



the principal bud; F^, its subtending leaf; F", the leaf below it, with its axillary shoot Ä^. 



II, II, two older lateral shoots (slightly reduced). C, Leaf, mag. 



(Drawn by E. W., 1908.) 



They grow in loose tufts, which no doubt in most cases have 

 only one strong root, the primary root. The adventitious roots 

 are weak and few in number; tufts, however, are sometimes 

 met with which by centrifugal growth, as in certain lichens, 

 become dead in the middle, while the periphery keeps on 

 growing in a circular or semi-circular form; in this case it is 

 no doubt only the numerous, slender, adventitious roots, which 

 nourish the plant. 



The vegetative shoots bear only foliage-leaves, which are 



