Pappus

Definition and stakes

Portrait of L. H. Bailey L. H. Bailey,  Beginners' botany (1921)

“ Each floret of the thistle (Fig. 190) is a complete flower. At a is the ovary. At b is a much-divided plumy calyx, known as the pappus. The corolla is long-tubed, rising above the pappus, and is enlarged and 5-lobed at the top, c. The style projects at e. The five anthers are united about the style in a ring at d. Such anthers are said to be syngenesious. These are the various parts of the florets of the Compositæ. In some cases the pappus is in the form of barbs, bristles, or scales, and sometimes it is wanting. The pappus, as we shall see later, assists in distributing the seed. ”
Source: Gutenberg

Portrait of Thomas Little Heath Thomas Little Heath,  1911 Encyclopædia Britannica, Volume 20… (1911)

“ The great work of Pappus, in eight books and entitled συναγωγή or Collection, we possess only in an incomplete form, the first book being lost, and the rest having suffered considerably. Suidas enumerates other works of Pappus as follows: Χωρογραφία οἰκουμενική, εἰς τὰ τέσσαρα βιβλία τῆς Πτολεμαίου μεγάλης ουντάξεως ὑπόμνημα, ποταμοὺς τοὺς ἐν Λιβύῃ, ὀνειροκριτικά. The question of Pappus’s commentary on Ptolemy’s work is discussed by Hultsch Pappi collectio (Berlin, 1878) , vol. iii. p. xiii. seq. ”
Source: Wikisource

Asa Gray,  The Elements of Botany, For Beginners and For Schools

“ In this case the pericarp is invested by an adherent calyx-tube; the limb of which, when it has any, is called the Pappus. This name was first given to the down like that of the Thistle, but is applied to all forms under which the limb of the calyx of the "compound flower" appears. In Lettuce, Dandelion (Fig. 384) , and the like, the achenium as it matures tapers upwards into a slender beak, like a stalk to the pappus.
Fig. 379. Akene of Mayweed (no pappus) . 380. That of Succory (its pappus a shallow cup) . 381. Of Sunflower (pappus of two deciduous scales) . 382.
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Source: Gutenberg

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