The tuft of hairs on each seed of thistles, dandelions, and similar plants, which assists dispersal by the wind.
clump, bunch, knot, cluster, tussock, tuffetView synonyms
- ‘The achenes produced by each capitulum are similar, possess a pappus of bristles that causes them to move upwind and a well-developed elaisome (oil-containing appendage).’
- ‘The pauciflorous capitulum consists of outer female florets with short ligules, inner hermaphrodite florets without a pappus, and five outer involucral bracts, up to 2 cm long, possessing long-stalked glandular hairs.’
- ‘The achenes are terete, narrowed at the base, 5 x 0 • 7 mm, ribbed and black, with a basal tuft of hairs and a pappus consisting of five ovate, petal-like scales.’
- ‘Coode and Richardson pointed out a relationship between Centranthus and Valeriana because both genera share a plumose pappus.’
Early 18th century: via Latin from Greek pappos.
(fl.c.AD 300–350), Greek mathematician; known as Pappus of Alexandria. His "Collection" of six books (another two are missing) is the principal source of knowledge of the mathematics of his predecessors.
We take a look at several popular, though confusing, punctuation marks.