Tricot\l\ and the Arrangement of Leases. 375 
in spite of their origin from tricotylons parents, produced 
considerably fewer fasciations than the tricotyls. 
We come now to the spiral torsions. These occurred 
in several of my tricotylous races nearly every year since 
1893, and often in considerable numbers. As a rule they 
Fig. 79. Aspcrula azurca. 
Fig. 80. Melampyrum pratensc. 
Tetracotylous plant with spiral 
arrangement of leaves (1887). 
consisted of fairly long, much twisted sections of the 
main stem, or of the stronger lateral branches which 
abutted above and below on the normal or decussate 
sections. They bore their leaves sometimes in a very 
steep spiral and sometimes in an unbroken line on one 
