lobelia
The plant's name refers to the helmet-shaped calyx on the outer whorl of the plant's tiny flowers. The flowers range in color from blue to pink.
Blue is not a common color for flowers. Bluebells, squill, lobelia, iris, spiderwort, forget-me-not, and wild flax.
Blue lace flowerBluebellsBluebonnet
There were 3 colors that appear on many things in the bible Blue - Purple and Red (Scarlet) Blue = techeilet Purple = Argamon Scarlet = (Tola'at) Shani Don't know about modern Hebrew though...
Angiosperms
Sure! Some blue flowers include hydrangeas, forget-me-nots, delphiniums, and cornflowers.
Buttercup. Cheese plant.
image flowers
if i am correct the marigold has yellow flowers and has "mar" in its name.
African Violets and Azaleas are flowers. Alyssum, Aster and Amaryllis also are flowers.
Adams-Needle
Jermain plant