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Aquilegia or Columbine is perennial wildflower, which is native to most temperate areas of the world. It tends to cross-pollinate, hybridize, and self-seed freely, creating new strains and colors. Columbine flowers come in many different colors, including red, pink, white, yellow, blue and purple. They bloom in late spring to early summer and self-seed readily if not deadheaded.
Detail of the flower of a rapeseed, Brassica napus, isolated on natural green unfocused background with copy space for text.
Flower of a creeping-oxeye, Sphagneticola trilobata, a widespread invasive species.
Horizontal closeup photo of buds on white Agapanthus flower heads growing on plants in a Summer garden. Soft focus background.
Blooming small yellow Chelidonium flower on a green background on a sunny day macro photography. Fresh celandine flowering plant with yellow petals in summer close-up photo.
Rape field
Common tansy,\nTanacetum vulgare summer yellow flowers closeup selective focus
Closeup of Rapeseed growing in the wild
Golden Shower tree (Cassia fistula) closeup photography
Ornamental Onion
Sunny Elegance, Radiant Yellow Flower Amidst Lush Green Leaves
Yellow Star Flower bud and yellow crocus
Blooming small yellow Chelidonium flower on a green background on a sunny day macro photography. Fresh celandine flowering plant with yellow petals in summer close-up photo.
close up of canola flowers in the field
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beautiful red flower
small yellow flower blooming and green leaves on plant
A macro of the flower of the lesser celandine (Ranunculus ficaria)
primula veris, red and yellow versions
Primula Julian is hybrid of primula polyantha and primula juliae. This popular species in Japan was introduced by repeated crossing of these two species. It is perennial plant, but in Japan it is normally used as annual, because it is difficult for the species to survive the hot summer in the outside. It blooms from November to April and suitable for use in garden beds and borders as well as in containers. The showy flower color ranges from red, red purple, pink, orange, blue, white, yellow to shades in between.
Golden shower flowers inside the botanical garden, Mahe Seychelles
close up of canola buds in the field
Bright Yellow Daylily with grass blade touching stamen
Low to short, slender perennial with a hairless stem. Basal leaf solitary, linear-lanceolate, flat, 5-12mm broad, generally yellowish-green; stem leaves 2, opposite or sub-opposite, lanceolate, margin  hairy. Flowers 7, yellow, 15-25mm, in an umbel-like cluster, each tepal with a band of green on the back; flower stalks hairy or not.
Wild mustard, Brassica growing in a nature reserve in northern Israel
Caltha flower. Ranunculus
Cowslips flowers that blooms at spring
Crocus, Germany, Eifel.
Close up of a cluster of yellow wildflowers on a meadow
Canola Flowers with buds in the field
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