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Because the collection has the overall appearance of a single flower, the collection of flowers in the head of this sunflower is called a pseudanthium or a composite. Pseudanthia are characteristic of the daisy and sunflower family ( Asteraceae ), whose flowers are differentiated into ray flowers and disk flowers, unique to this family.
A typical Asteraceae flower head showing the (five) individual ray florets and the (approximately 16) disk florets of a specimen of (Bidens torta) In plants of the Asteraceae, what appears to be a single "daisy"-type flower is actually a composite of several much smaller flowers, known as the capitulum or head.
Asterales (/ ˌ æ s t ə ˈ r eɪ l iː z / ASS-tər-RAY-leez) [2] is an order of dicotyledonous flowering plants that includes the large family Asteraceae (or Compositae) known for composite flowers made of florets, and ten families related to the Asteraceae. [3]
Like all members of the sunflower family, the flowering structure is a composite inflorescence, with rose-colored (rarely yellow or white) florets arranged in a prominent, somewhat cone-shaped head – "cone-shaped" because the petals of the outer ray florets tend to point downward (are reflexed) once the flower head opens, thus forming a cone ...
They have the typical inflorescences of the family, in which what may appear to be a single flower is actually a composite flower head composed of many individual flowers or florets. Small tightly packed florets make up the central disc, which is surrounded by florets with longer petals (ligules), making up the rays of the complete flower head.
The generic name Cosmos derives either from the Greek κόσμος (cosmos) ‘(ordered) world’ -in reference to the neat, orderly arrangement of the floral structures [5] - or the Greek κόσμημα (kósmima) ‘jewel’ - in reference to the jewel-like colours of the capitula (composite flowers).
It blooms from March to September [4] and exhibits the phenomenon of heliotropism, in which the flowers follow the position of the sun in the sky. The flowerheads are composite, about 2 to 3 cm ( 3 ⁄ 4 – 1 + 1 ⁄ 4 in) in diameter, in the form of a pseudanthium , consisting of many sessile flowers with white ray florets (often tipped red ...
Silphium perfoliatum, the cup plant [2] or cup-plant, is a species of flowering plant in the family Asteraceae, native to eastern and central North America. It is an erect herbaceous perennial with triangular toothed leaves, and daisy-like yellow composite flower heads in summer.