Hello, can you tell me what are these two plants in my backyard, photos attached, location is Sydney, Australia.

Not sure about the first photo, but the second one looks like elder (Sambucus)

For #2 I first thought of Sambucus, but don't they all have serrated margins?

The first one might be Hoheria. Could the second be Flava bean?

I think #2 could a Senna.

Addtional information for #2, in the evening its leaves are pairing together, like hands pressed together firmly and evenly.

Thanks to everybody!

Sennas do that, but I don't know which kind this one is.

Do you have Ochna sp arround? it looks like O. serrulata to me
http://www.killcarewagstaffetr...
The second looks really like a Senna sp, flower will help much for the species ID. so perhaps please post a flower again in the future after it blooms

I thought Ochna for the first one too... The leaves themselves aren't the whole story.. It's the stippling on the stems that look correct.. The flowers are kind of fun and distinctive, and will confirm for you when it blooms. AKA the "Mickey Mouse Plant'. I've killed two.
https://weeds.brisbane.qld.gov...

Pretty sure the first one is not Hoheria.. again.. it's the stems..