| 释义 |
nounPlural pappi ˈpapəsˈpæpəs Botany The tuft of hairs on each seed of thistles, dandelions, and similar plants, which assists dispersal by the wind. 〔植〕冠毛 Example sentencesExamples - 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.
- 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.
Synonyms clump, bunch, knot, cluster, tussock, tuffet
Derivativesadjective paˈpəʊs Botany The mandibular palp is very large, flattened, and has pappose setae along the rim. Example sentencesExamples - Fundamentally, in a calm atmosphere, pappose seeds make vertical descending flights by utilizing the drag force acting on the pappi.
OriginEarly 18th century: via Latin from Greek pappos. proper nounˈpapəsˈpæpəs (fl.c.300–350 AD), Greek mathematician; known as Pappus of Alexandria. Little is known of his life, but his Collection of six books (another two are missing) is the principal source of knowledge of the mathematics of his predecessors.
nounˈpæpəsˈpapəs Botany The tuft of hairs on each seed of thistles, dandelions, and similar plants, which assists dispersal by the wind. 〔植〕冠毛 Example sentencesExamples - 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.
- 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.
Synonyms clump, bunch, knot, cluster, tussock, tuffet
OriginEarly 18th century: via Latin from Greek pappos. proper nounˈpapəsˈpæpəs (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.
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