22 



Knud Jessen. 



Pot.pulchella has a vigorous multicipital primary root,which 

 may attain a considerable length — about 30 cm. or perhaps 

 more — and probably lives as long as the plant; adven- 



Fig. 7. Potentilla pulchella (From Snenæs in Greenland). 



A, Shoot with internodes elongated to an unusual degree ; / — /, the monopodial main axis 

 bearing in its basal part dead fragments of leaves from the previous year; //, flowering 

 lateral axes (12. 7. 1908; the upper floral axis is wrongly marked I); about natural size. 

 JS, /. Jiumilis ; d, closely packed dead fragments of leaves ; at the top the living leaves 

 form a layer a few mm. in height (22. 6. 1908) ; about natural size. C, Pistil which has 

 not as yet received any pollen; -Vi. D, Fragment of a style with stigma upon which are 

 germinating pollen grains : '-'" i. 



titious roots are probably not developed. The often numer- 

 ous, rosette-leaved shoots are usually very close-set, and 

 solid tufts of considerable size (about 20 cm. in diameter) 

 may be formed. The new leaves project between the crowded 



