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A rounded, knoblike, usually terminal proturberance on a structure.
One of the rounded cells on the manubrium in the antheridia of lichens belonging to the Caliciales.



(also head) a monopodial inflorescence in plants whose main axis has thickened into a patelliform or globular surface on which small flowers are usually distributed. The flowers are tubular, ligulate, or pseudoligulate. This type of inflorescence is primarily characteristic of plants of the family Compositae (daisy, dandelion, and sunflower). It is also found among plants of the families Umbelliferae (eryngo and sanicle) and Campanulaceae (sheep's-bit). The capitulum is surrounded by a many-leaved involucre, formed by the bracts of the outer flower (in sheep's-bit) or by modified apical leaves (in Compositae). This structure aids in the pollination of the flowers. In the process of evolution, several biological adaptations occurred to prevent self-pollination. For example, the flowers open gradu-ally, and the stamens develop earlier than the pistils. The capitulum developed from the umbel as a result of the reduction of the length of the flower stem.

References in periodicals archive ?
Emergence of adults from the capitula collected and held in the screen house in 2011 further supported this as the F1 emergence from the capitula began in early Jul (Fig.
To quantify longevity of each reproductive stage (number of days for each stage of development), 10-15 capitula at the early stage of budding were marked on [greater than or equal to] 5 individuals/site/species.
The case for AElfric's knowledge of Radulf's Capitula finds further support in at least three other loci in the pastoral letters:
The analyzed variables were: total dry matter of the capitula, and content (% of flavonoid in 100 g of capitula) and yield (g plant-1) of flavonoids and essential oil.
2-3 cm lata, acuminata, serrata vel serrulata, supra minute scabriuscula, infra dense hispidula; capitula in cymis paucifloribus terminalibus disposita, pedunculis usque 8 cm longis; involucrum campanulatum graduatum bracteis 12-15 apice purpureis; flores radii 5-8, laminis oblongis vel ellipticis 5-6 mm longis luteo-aurantiacis; flores disci 20-30, corollis 4-5 longis luteis; achenia radiii trapezoidea valde compressa ca.
Karl-Georg Schon, editor de los Capitula Angilramni (103), promueve el <<Projekt Pseudoisidor>> (104).
Many genera have a very reduced inflorescence axis to form capitula that may be condensed-spiciform (as in various Brayulinea Small, Mechowia Schinz, Pandiaka, Philoxerus R.
Although much of this material has been known for a long time, its proper study has only recently become possible with the publication of the Capitula (or Statuta) episcoporum by the Monumenta Germaniae Historica in four volumes between 1984 and 2005.
Carine Van Rhijn summarizes studies of the MGH Capitularia, Concilia and Capitula Episcoporum, demonstrating that the divisions between these three types of documents are not clear but that the latter should be qualified based on their addressees, which were secular priests.
43), el Concilio de Nicea (325) (44), I de Toledo (400) (45), de Gerona (517) (46), de Lerida (546) (47) y en los Capitula Martini (572) (48).
8) Part 2 was formerly bound with Cambridge, Corpus Christi College, MSS 191 and 196, and principally contains the Capitula of Theodulf (of Orleans) in Latin and Old English translation.