232 JOURNAL OF THE ARNOLD ARBORETUM [vol. iv 



I received in the autumn of 1916 this peculiar form through the kindness 



of Mr. M. L. de Vilmorin. He sent me three specimens. One which I 



regard as the type had been collected in his Fruticetum (Les Barres) on 



Sept. 21, 1910 ("no. 1008 Y, Berberis du 30.3.05"). It has almost ripe 



fruits. The second specimen was collected on May 10, 1908 ("Berberis 



du 30 Mars 1905 ") ; a flowering specimen of the fruiting plant. The third 



is sterile, collected on Sept. 13, 1910 ("Berberis from Verrieres, ? Garden 

 origin ). 



This form represents apparently a cross between the evergreen B. 

 pminosa Franch., and the deciduous B. diaphana Maxim. In its angular 

 twigs, slightly dentate leaves, and in its numerous ovules this hybrid 

 comes nearer B. diaphana, but the less veined leaves, the apparently 

 more vigorous growth, the more robust spines, the smaller flowers and the 

 fruits clearly indicate the influence of B. pruinosa From the Kew 

 Arboretum I saw a specimen collected in October, 1916 and bearing the 

 name B. vulgaris divaricata that looks much like this hybrid. I wish to 

 name this form in honor of the late Mr. Maurice L. de Vilmorin to whom 

 I am under such great obligations for all the assistance he has given me 

 during my dendrological studies. 



Berlin-Dahlem, June, 1923. 



