Baptisia 'Cherries Jubilee' has unique orangey-maroon lupin-like flowers over blue-green foliage.
Baptisia 'Lemon Meringue' is a false indigo with bright yellow lupin-like flowers open from dark buds atop bluish green foliage.
Baptisia 'Pink Lemonade' is an exciting hybrid with stalks of flowers that open yellow, morph to pink and then darken to lavender.
Begonia xanthina has magnificent mottled foliage that changes through the growing season along with yellow flowers.
Begonia 'Golden Wave' is from the Belgium Novelty collection with bi-colors of yellow and peach with peach edging.
Begonia 'Picotee Yellow' is from the Belgium Novelty collection with ruffled yellow blooms and picotee edging of rosy orange.
Begonia 'Sunny Dream' is from the Belgium Novelty collection with double blooms of lemon yellows.
Berlandiera lyrata forms masses of yellow daisies from spring until fall that smell distinctly like chocolate.
Bletilla ochracea is a rare species of terrestrial orchid from Japan that produces elegant, cattleya-like, yellow flowers with red markings on the white lip.
Bouteloua gracilis 'Blonde Ambition' has chartreuse flowers that mature to blonde seed heads held like jaunty pennants on stiff stems over blue-green foliage.
The rare red angel's trumpet, Brugmansia sanguinea, is of the most distinctive and striking species with red and yellow trumpets.