School Assignment: Need help to identify seeds!!

I had a field trip last week and it was fun, however, writing a report isn't. Please! I need your help to identify the species of the seeds because I have no idea how they transmit.

Seed 1
https://www.dropbox.com/s/vq538671zmudksz/544216_587013207975771_1071295834_n.jpg
https://www.dropbox.com/s/cwtm3lp8gyava6d/IMG_20130323_111122_410.jpg

Seed 2
https://www.dropbox.com/s/94dz39rm05f9s45/IMG_20130323_101221_106.jpg
https://www.dropbox.com/s/me1y1t5s85rd6sy/IMG_20130323_101226_951.jpg

Seed 3
https://www.dropbox.com/s/lnhcbgnvv7yh30w/521448_587013457975746_1513867427_n.jpg

They are found in Hong Kong and I need your help, please!!!!

 

# 1 is a plane Platanus.

 

Thank you very much, it seems so. I thought that it was burdock seeds :)

The third one maybe is a fruit, but still please help to identify!!

 

#3 - similar to Smilacina

 

I agree, it looks like Smilacina racemosa

 

2 more photos for seed 2 to help you to identify

https://www.dropbox.com/s/k67cntk9q0hsmcs/5325_10200915482312497_265383441_n.jpg
https://www.dropbox.com/s/b1t07zvzin2n3nn/24659_10200915484952563_892103723_n.jpg

 

2 - perhaps Laurocerasus.

 

Sorry, I forgot to say that the seeds should be from a red flower https://www.dropbox.com/s/akkquk8s6ghltk0/擷取.JPG

 

Looks like Sterculia of some kind. These are opened fruits, not flowers.

 

Thanks!!