July 1913.J 



S. NOW A RA.—STA TISTISCHE STUDIEN 



141 



Fig. 2— Variationskurvc 

 der Staubblattcrzahl. 



Untergebrochene Linie 

 betrifft " K6rai. ,} 



Ununtergebrochene Linie 

 be trifft ' 4 Ma tusima.' ' 



40 41 42 43 44 43 46 47 43 49 50[ 51 52 53 54 55 56 57 5S 59 60 61 62 63 64 65 66 67 68 

 M 



In diesem Falle ist der Korrelationskoeffizient (r) positiv 

 und viel grosser als der bei " Korai." 



Nach einigen Autoren kann man zwei verschiedene Typen 

 von den gefiillten Bliiten unterscheiden. So z. B. sagte de 

 Ykdss«: 



" Generally speaking there are two principal types of 

 doubles. One is by the conversion of stamens into petals, and 

 the other is an anomaly, known under the name of petalomany. 



The change of stamens into petals is a gradual modification. 

 All intermediate steps are easily to be found. 



In some flowers all stamens may be enlarged, in others only 

 part of them. Often the broadened filaments bear one or two 

 fertile anthers. 



Petalomany is the tendency of the axis of some flower never 

 to make any stamens or pistils, not even in altered or rudi- 

 mentary form. Instead of these, they simply continue producing 



(1) de Vries : — Species and Varieties, their origin by mutation, p. 330. 



