Hemi-Syncotyly, Syncotyly, Amphi-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 Helianthus annuus. 1 Further disturbances 
ma / then follow, such as unequal size of the two leaves 
Fig. 95. Mercurialis annua. Syncotylous seedlings. A and 
B, hemi-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 fasciation occur 
1 Over dc erfelykheid van Synfiscn. Bot. Taarboek, Gent, 
Plate TV. 
