[S. elatior] unbranched [S. incarnata] sparsely branched [Attribute] 
Stem
S t e m
L e a f a r r a n g e m e n t
P e t i o l e s
I n f l o r e s c e n c e
C a l y x
H a b i t a t
G e o g r a p h i c a l d i s t r i b u t i o n