The Bahamas
The national flower of The Bahamas is the Yellow Elder (Tecoma stans)
The flowers have an odd but pleasing fragrance and also provide nectar for bees. The Indians made bows from its wood, and in Mexico a beer was prepared from its roots; it has also been used for a variety of medicines. Also known as: Yellow Bells, Hardy Yellow Trumpet, Trumpet-flower, Yellow Elder.
Belize
The national flower of Belize is the Black Orchid (Prosthechea cochleata)
Bolivia
Bolivia gets two of everything, because the east and the west never get along. Bolivian national flowers are cantuta (Catua buxifolia) and patujú (Heliconia rostrata).
Brazil
Tabebuia alba flower (Tecoma alba)
Bangladesh
The national flower and national emblem of Bangladesh is the shapla (Nymphaea nouchali)
Bhutan
Bhutan – Blue poppy (Meconopsis grandis)
Brunei
Brunei Simpor (Dillenia suffruticosa)
Bosnia and Herzegovina
Bosnia and Herzegovina – Lilium bosniacum
Bulgaria
Rose
I took an almost identical shot of this flower on Tenerife Island.
This province of Spain has the most unusual tree as emblem or call it national plant. Admire it at http://www.tenerife-holiday-home-insider.com/holiday-in-tenerife.html. It’s the ages old Drago of Icod de los Vinos which belongs to the onion family to the best of my knowledge.