3 favorite votes.  

Hybrid Tea.
Registration name: Sunnymount
Exhibition name: Sunnymount

Discovered by Nicholas Grillo (United States, 1936).

Hybrid Tea.  

Butter-yellow.  Strong fragrance.  50 petals.  Medium, very full (41+ petals), borne mostly solitary bloom form.  Prolific, continuous (perpetual) bloom throughout the season.  Medium, pointed buds.  

Upright.  Leathery foliage.  

USDA zone 6b through 9b (default).  Vigorous.  

United States - Patent No: PP 334   VIEW USPTO PATENT