As with the bracts, the nature of the pappus is an important diagnostic feature.
From the en.wikipedia.org
Pappus states that the spiral of Archimedes was discovered by Conon.
From the en.wikipedia.org
Pappus gives also a complete enunciation of one porism of the first book of Euclid's treatise.
From the en.wikipedia.org
The disc seeds have a pappus of hairs for wind dispersal.
From the edp24.co.uk
Pappus of Alexandria got there first, about 1700 years ago.
From the newscientist.com
Some species also have additional shorter scales in the pappus, and there is one species that lacks a pappus entirely.
From the en.wikipedia.org
Pappus gives a complete enunciation of a porism derived from Euclid, and an extension of it to a more general case.
From the en.wikipedia.org
The calyx of the florets may be absent, but when present is always modified into a pappus of two or more teeth, scales or bristles and this is often involved in the dispersion of the seeds.
From the en.wikipedia.org
Pappus then enumerates works of Euclid, Apollonius, Aristaeus and Eratosthenes, thirty-three books in all, the substance of which he intends to give, with the lemmas necessary for their elucidation.
From the en.wikipedia.org
More examples
Calyx composed of scales or bristles or featherlike hairs in plants of the Compositae such as thistles and dandelions
In flower heads of the plant family Asteraceae, pappus is the part of an individual disk or ray floret surrounding the base of the corolla, equivalent to the calyx of a non-compound flower. ...
Pappu is a common first name in North India. It conjures up the image of a common man, and has been used frequently in popular culture (e.g. the A R Rahman's chartbuster "Pappu can't Dance Sala", Election Commission's "Pappu can't vote" campaign and Cadbury's "Pappu Pass Ho Gaya" ad campaign).
(Pappu) Toor Daal (Kandi Pappu) or Moong Daal (Pesara pappu) cooked with a vegetable or green. No masala is added to the dal. Some regions include garlic and onion in the seasoning while some regions prefer asafetida (hing/Inguva). ...
The modified calyx in the Asteraceae, composed of hairs, bristles, awns, or scales.
The modified calyx of flowers in the sunflower family; usually takes the form of bristles, scales, or awns.
The group of appendages, usually hairs or scales, above the ovary and outside the corolla in Asteraceae (possibly a modified calyx); often persisting on the fruit and aiding in its dispersal.
In Asteraceae, the aggregate of structures such as awns, bristles, or scales arising from the top of the inferior ovary, in place of the calyx.
Small hairs borne at tip of seed (composite flowers only).