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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.
The ray floret is female with one pistil containing one style, two stigmas, and an ovary with one ovule. Labeled parts are as follows: Labeled parts are as follows: 1 – corolla (petals) (three petals are joined to form a strap, and in the case of 5 petals, they form a ligule);
Either ray or disk flowers may be absent in some plants: Senecio vulgaris lacks ray flowers [4] and Taraxacum officinale lacks disk flowers. [4] [5] The individual flowers of a pseudanthium in the family Asteraceae (or Compositae) are commonly called florets. [6] The pseudanthium has a whorl of bracts below the flowers, forming an involucre.
Ray florets in the Symphyotrichum genus are exclusively female, each having a pistil (with style, stigma, and ovary) but no stamen. Ray florets accept pollen and each can develop a seed, but they produce no pollen. [6] The ray florets of S. lateriflorum bloom earlier and are likely receptive to pollen longer than the disk florets. [15]
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.
These ray florets are about 6 mm (¼ in) long and 1½ mm (0.06 in) wide, with glandular hears on the tube shaped base. The disc florets are about 4 mm (0.16 in) long and also have a glandular tube. Within the ray florets are five anthers merged into a tube through which the style grows while gathering the pollen on its shaft.
Ray florets in the Symphyotrichum genus are exclusively female, each having a pistil (with style, stigma, and ovary) but no stamen. Ray florets accept pollen and each can develop a seed, but they produce no pollen. [2] Each ray floret has a strap-shaped corolla (or ligule) formed from three vestigial petals which are fused
Felicia filifolia is a Southern African member of the family Asteraceae. It is a hardy, sprawling shrub growing to about 1 metre tall. Leaves are narrow (filifolia = threadlike leaves) and clustered along the twigs. When blooming it is densely covered in flowerheads with ray florets that are pink-mauve to white and disc florets that are yellow ...