184 



de Vries's T. pratense quinqitefolium, I potted the whole stool 

 upon which it grew for further observation. The following 

 remarks, however, refer only to the leaves of that sprout which 

 bore the leaf with five leaflets just mentioned. A few days after 

 the plant was potted a new leaf, number 6, appeared from between 

 the infolded stipules of number 5 and upon the same side of the 

 axis of the sprout. This leaf consisted of six leaflets and, like 

 number 5, it had a strong petiole with a shallow median groove 

 along its upper side ; and a cross section showed that the internal 

 canal was double. Number 7 soon came out on the opposite 

 side of the sprout and bore only three leaflets. Number 8 

 came out on the same as numbers 5 and 6, bearing six leaflets 

 upon a petiole like that of each of those numbers. Only these 

 three abnormal leaves appeared and they were preceded and fal- 

 lowed by normal leaves on the sprout that bore them. The 

 structure of the petiole of each plainly shows connation, and it 

 necessarily follows that the leaflets in excess of three were not 

 supernumeraries, but normal leaflets of one of the two petioles 

 which are thus represented. The double character of these 

 three petioles was easily traceable from the leaflets to the stipules 

 but there it disappeared, and I found no trace of duplication of 

 the stipules. The connation in number 6 extended to the two 

 middle petiolules of the leaflet cluster and also to the lower part 

 of the two leaflet blades which they bore ; but in numbers 5 and 

 8 all the leaflets and petiolules were fully separate. I assume 

 that one of the leaflets of number 5 was aborted. These three 

 abnormal leaves are evidently monstrosities and not such cases 

 of true multiplication of leaflets as occur in T. pratense quinqne- 

 folium and in ordinary four-leafed clover. The leaves here re- 

 ferred to, numbers 5, 6, 7, and 8, are preserved in the herbarium 

 of the U. S. National Museum. 

 Washington, D. C, 

 November, 1902. 



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