5 favorite votes.  

Medium yellow Hybrid Tea.
Registration name: Ulster Gem

Bred by Hugh Dickson (c.1877 -1922) (United Kingdom, before 1917).
Introduced in Australia by Brundrett's The Rose People in 1917 as 'Ulster Gem'.

Hybrid Tea.  

Yellow.  Canary yellow.  Mild fragrance.  Average diameter 6".  Very large, single (4-8 petals), cluster-flowered, open bloom form.  Blooms in flushes throughout the season.  

Bushy.  Large, dark green, leathery foliage.  

USDA zone 6b through 9b (default).