112 Knud Jessen. 



These two species have terminal floral-shoots 

 while all the other Potentillas mentioned in this paper 

 are monopodial. 

 b. Perennial herbs. 



1. Spotbound are Potentilla pulchella, Pot.nivea, Pot. 

 Vahliana, Pot. emarginata, Pot. maculata, Sibbaldia pro- 

 cumbens, Alchimilla alpina, A. jærøensis and A. vulgaris. 

 Features common to them all are monopodial, rosette- 

 formed assimilatory-shoots and lateral floral-shoots. The 

 Potentillas, Sibbaldia and Alchimilla alpina have primary 

 roots of- long duration, and they distinctly belong to the 

 type "Radix vel rhizoma multiceps" ; the other Alchi- 

 millas branch less freely, and their primary root un- 

 doubtedly dies rather early. They live through the 

 winter with their shoot-apices protected by the sheaths 

 of dead and living leaves. To evergreens proper 

 only Pot. maculata can be referred. It is however 

 probable that other species also may live through 

 the winter with a few green leaves, and as regards 

 this point local differences no doubt take place. In 

 species such as these which have no true winter-buds 

 it is difficult to draw a sharp limit between the winter- 

 green and the not winter-green habit, since the leaves 

 of the following summer may grow out slightly in the 

 preceding autumn. This uncertainty is no doubt the 

 reason of the often contradictory records. — The leaf- 

 structure would most nearly be characterized as mezo- 

 morphic in Pot. emarginata and Alch. vulgaris and as 

 more or less xeromorphic in the others. 



2. Wandering perennial herbs are Pot. anserina 

 and the Rubus-species. 



Pot. anserina has a rosette-formed, monopodial 

 main shoot and lateral floral axes which behave as 

 runners. Vegetative propagation takes place by the 



