Stuck on last two and going round in circles! 13a Coniferous trees of the cypress family found in North America and Asia (5). ..... I have T-U-A 23d Belonging to the tea family of plants (9) ......... I have - H-A-E-U-. Have tried theaceae but cannot find suitable variant. I should be able to find 13a but maybe i'm having one of those days??
I am sure13a is thuja (cupressaceae family - pronounced "thuya" ), not tsuga which is pinaceae family and is also called Western Hemlock (see Wikipedia, the free encyclopedia)