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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);
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 15–33 ray florets are blue, pink, purple, or white, with a length averaging 5–7 mm (1 ⁄ 5 – 3 ⁄ 10 in) [c] and width of 1–1.7 mm (1 ⁄ 24 – 1 ⁄ 16 in). [5] Ray florets in the Symphyotrichum genus are exclusively female, each having a pistil (with style , stigma , and ovary ) but no stamen ; thus, ray florets accept pollen ...
Symphyotrichum (/ ˌ s ɪ m f aɪ ə ˈ t r ɪ k əm /) is a genus of over 100 species and naturally occurring hybrids of herbaceous annual and perennial plants in the composite family, Asteraceae, most which were formerly treated within the genus Aster.
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.
There are 16–20 ray florets (sometimes as few as 12) which are usually white, but may rarely be pink. The ray florets are 5–8 mm long and 0.5–1.2 mm wide. Ray florets in the Symphyotrichum genus are exclusively female, each having a pistil (with style , stigma , and ovary ) but no stamen ; thus, ray florets accept pollen and each can ...
The ray florets, the long petal-like appendages, number between 5 and 60 and are pistillate and fertile. Their corollas are white to purple in colour and coil at maturity. The disc florets, the tiny flowers at the center of the flower structure, number from 8 all the way up to 260 and are bisexual and fertile. Their corollas are yellow, though ...