This is the seed stalk and should not be allowed to grow unless you intend to save the seed.
Whattle (Acacia so. ) flowers are yellow. There is some variation in the brightness of the flowers between whattle species. Some species have quite bright yellow flowers, whereas others have pale yellow flowers. Some species have very pale flowers which appear to be white, but the most common colour is yellow.
Wattle flowers are yellow.
Vegetable flowers are not all yellow.
Male and female flowers appear as catkins and are produced early in spring, They are rose coloured in bud but orange and purple after flower. The filaments are usually pale yellow
Primroses are a type of primula with yellow flowers.
Buttercup flowers are typically yellow in color, ranging from pale yellow to a vibrant golden yellow.
They will improve your health and enrich your life
if i am correct the marigold has yellow flowers and has "mar" in its name.
Hummingbirds will visit red flowers and yellow flowers with the same frequency.
The flowers of mimosa trees can vary in color, but they are commonly pink, white, or yellow.
Brassicas allowed to run to seed will have small yellow flowers.
The tall plant with yellow flowers you may be referring to is likely a sunflower.