1) Decurved 2) Turned backward 1) Decurved 
directed backwards or downwards; cf. antrorse.
bent or directed downwards or backwards. cf. antrorse
turned, bent or curved away from the apex
turned back or downward
In a backward or downward direction. 
• (a.) Bent backward or downward.
Pointed strongly backwards towards the base.
Bent backward or downward, reflexed (compare antrorse)
Directed backwards or downwards. ... Compare: antrorse. ... (09 Oct 1997) ... 
bent backward or downward, reflexed
Projecting backward or downward.
Pointing downward.
Re·trorse' adjective [ Latin retrorsus , retroversus ; retro back + vertere , versum , to turn. Confer Retrovert .] Bent backward or downward. -- 
Bent or turned over back or downward.
turned, bent or curved away from the apex
[adj] - (biology) bent or curved backward or downward
adjective bent or curved backward or downward; `leaves with retrorse barbs`