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Heliotropism, a form of tropism, is the diurnal or seasonal motion of plant parts (flowers or leaves) in response to the direction of the Sun. The habit of some plants to move in the direction of the Sun, a form of tropism, was already known by the Ancient Greeks. They named one of those plants after that property Heliotropium, meaning "sun turn".
A mathematical sunflower can be pictured as a flower. The kernel of the sunflower is the brown part in the middle, and each set of the sunflower is the union of a petal and the kernel. In the mathematical fields of set theory and extremal combinatorics , a sunflower or Δ {\displaystyle \Delta } -system [ 1 ] is a collection of sets in which ...
Diagram of flower parts. In botany, floral morphology is the study of the diversity of forms and structures presented by the flower, which, by definition, is a branch of limited growth that bears the modified leaves responsible for reproduction and protection of the gametes, called floral pieces.
Receptacle – the end of the pedicel that joins to the flower were the different parts of the flower are joined; also called the torus. In Asteraceae, the top of the pedicel upon which the flowers are joined. Seed – Sepal – Antipetalous – when the stamens number the same as, and are arranged opposite, the corolla segments; e.g. Primula.
A collective name for the male reproductive parts of a flower; the stamen s of a flower considered collectively. Contrast gynoecium. Abbreviated A; e.g. A 3+3 indicates six stamens in two whorl s. androgynophore A stalk bearing both the androecium and gynoecium of a flower above the level of insertion of the perianth. androgynous
[4] [5] [6] A petal often consists of two parts: the upper broader part, similar to a leaf blade, also called the blade; and the lower narrower part, similar to a leaf petiole, called the claw, [3] separated from each other at the limb. Claws are distinctly developed in petals of some flowers of the family Brassicaceae, such as Erysimum cheiri.
The plant flowers in summer. What is often called the "flower" of the sunflower is actually a "flower head" (pseudanthium), 7.5–12.5 centimetres (3–5 in) wide, [4] of numerous small individual five-petaled flowers ("florets"). The outer flowers, which resemble petals, are called ray flowers.
The floral axis (receptacle) is the circle in the middle, surrounded by staminodes, petals, and sepals. The main axis is the circle at the top of the diagram [2] Floral diagramming is a method used to graphically describe a flower. In the context of floral diagramming, the floral axis represents the center point around which the diagram is ...