Hoin-Syncofyly, Syucolyly, .hnplii-Syncotyly. 463 



the syncotylous organ a node with only one leaf, which 

 then usually stands opposite to this structure. I have 

 frequently observed such cases in Mercurialis annua 

 (Fig*. 95) and Hclianthus annuns} Further disturbances 

 ma / then follow, such as unequal size of the two leaves 



Fi<?. 95. Mercurialis annua. Syncotylous seedlings. A and 

 B, hcmi-syncotyls with normal arrangement of leaves ; 

 C and D, completely syncotylous; the first leaf is single 

 and opposite the cotyledon. 



of a pair, leaves with two apexes, and in the same cul- 

 tures such even occur not infrequently immediately above 

 the cotyledons. 



Not infrequently spiral torsion and fasciati(^n (KCiu* 



' Over de erfeJykheid van Syniisen. Bot. Taarboek. Gent. i«S9=;, 

 Plate TV. 



