In these cases the peduncles may persist and may even be modified into spinous organs of defence.
The mesarch structure of the leaf-bundles is met with in a less pronounced form in the flower peduncles of some cycads.
Bracts are occasionally persistent, remaining long attached to the base of the peduncles, but more usually they are deciduous, falling off early by an articulation.
The primary axis of the inflorescence is sometimes called the rachis; its branches, whether terminal or lateral, which form the stalks supporting flowers or clusters of flowers, are peduncles, and if small branches are given off by it, they are called pedicels.
The floral axis sometimes appears as if formed by several peduncles united together, constituting a fasciated axis, as in the cockscomb, in which the flowers form a peculiar crest at the apex of the flattened peduncles.
The adhesion of the peduncles to the stem accounts for the extraaxillary position of flowers, as in many Solanaceae.
Usually, however, the floral axis, arising from a more or less altered leaf or bract, instead of ending in a solitary flower, is prolonged, and bears numerous bracteoles, from which smaller peduncles are produced, and those again in their turn may be branched in a similar way.
Carthusianorum, &c., in which the peduncles are short, and the flowers closely approximated, with a centrifugal expansion, the inflorescence has the form of a contracted dichasium, and receives the name of fascicle.
The nature of the fructification of Sigillaria was first satisfactorily determined in 1884 by Zeiller, who found the characteristic Sigillarian leaf-scars on the peduncles of certain large strobili (Sigillariostrobus).
16), and others known under such names as Pterophyllum or Ptelophyllum pecten, &c., both common Jurassic species - as well as to stems bearing peduncles with terminal oval flowers, similar in form to those of Bennettites.