The identity of the Lulav:
The Torah states that one is to take a Kapos Temarim. This refers to a branch that grows on a date palm.
Are branches from the male palm trees that do not grow dates valid?
Yes. It is not necessary for the palm tree to grow dates.
The canary palm:
How to identify a canary: 1. The spine of the canary palm bends when held. 2. Its leaves grow closer together.
3. It has a very short spine.