Native from North America, the history of the sunflower plant is, for he has traveled thousands of kilometers from it’s discovery to it’s exportation, to be marketed in Russia, and it’s return to it’s original habitat years later. Currently its cultivation as food and ornamental plant is widespread in many temperate regions, among which Peru, Argentina, Bolivia, Mexico, Russia, France, Spain and China.
meaning “flOWer of the sUn.”
: sUnflOWer .
The scientific name comes from GreeK
and it is composed of the words :
heli frOm heliOs = sUn
anthUs frOm anthOs = flOwer
Its common name refers to its peculiarity of being heliotropic,
that’s to say, its ability to orient itself to the sOlar Star,
and follow it in it’s diurnal course.Sunflowers grow on dry, sunny places , because their roots can explore deeper soil layers.
g.Old . . . liKe memOrieS
is a fine to coarse powdery substance comprising pollen grains which are male microgametophytes of seed plants, which produce male gametes [sperm cells]
A liTtle oNe?
will visit sunflowers. Honey bees and bumble bees are known to be effective pollinators of this crop, with bumble bees providing higher yield increases than honey bees.
beeS pOllinate sUnflOWers
The showy outer ray petals help attract the pollinators. Bees go from flower to flower within the disc, becoming covered with pollen. They then pollinate other sunflowers as they go from plant to plant. The success of sunflower as a crop for seeds and oil depends totally on bees.
The sunflower resembles one huge flower, a single sunflower head hosts hundreds of tiny flowers called florets. The plant is a rather thick, green stem sticking up out of the ground around 10 feet (3 meters) tall with a few leaves growing from it.
is a sugar-rich liquid produced by plants in glands called nectaries.
is a sweet food made by bees foraging nectar from flowers.
The yellow petals
are actually protective leaves
that cover the centre of the head while it is growing. The brown centre of the sunflower is composed of a mass of hundreds of flowers, all growing individually, and from where each sunflower seed will originate.
The disc florets open in sequence, beginning at the periphery of the disc and moving inward. Each floret is first male, with the pollen-bearing anthers extending above the rim of the floret. Later, the style pushes up and the stigmatic lobes spread, opening the receptive surfaces for pollination. If pollinator activity is adequate, the pollen is removed from each floret before the stigma opens, reducing the chances for self-pollination.