One year old

1-1 There were no thorns until the latest growth spurt

1-2  The most vigorous?  March 26 thorns are same size as 1-1, widest petioles.  On Unifoliate

F2 plants from Citrus grandis x C. trifoliata.  Attractive and rapidly growing.  No flowers or fruit yet.

Pentfoliate

Pentfoliate leaf on probable tetraploid Swingle plant

This plant was out all winter on the ground under a protected Owari 

Satsuma.  There is also a unifoliate leaf.