Capitulum

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capitulum

[kə′pich·ə·ləm]
(biology)
A rounded, knoblike, usually terminal proturberance on a structure.
(botany)
One of the rounded cells on the manubrium in the antheridia of lichens belonging to the Caliciales.

Capitulum

 

(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 ?
Capitulescences monocephalous or few capitula, on scapes; capitula homogamous, radiate; receptacle epaleate; involucre multiseriate.
Capitulescences densely corymbose; capitula short-pedunculate, homogamous, radiate, five- to six-flowered; receptacle epaleate; involucre three- to six-seriate.
In the Quinque capitula, submitted to Paul III on September 3, 1539, the initial conditional sentence that describes the finality of the Society was put in this way: "Whoever desires to serve as a soldier of God (Deo militare) beneath the banner of the cross in our Society, which we desire to be designated by the name of Jesus, and to serve the Lord alone and his vicar .
Capitulescences corymbose to paniculate; capitula pedunculate to subsessile, homogamous, discoid or radiate; receptacle paleaceous, paleae thin, scarious, embracing the central florets; involucre one- to two-seriate.
Capitulescences monocephalous or in cymes, terminal; capitula short-petiolate, homogamous, discoid; receptacle epaleate, alveolate; involucre multiseriate.
Fast alle von ihnen zeigen voll kondensierte Capitula verschiedener Art.
Each yr there was an initial increase in the number of overwintering adult weevils collected in mid to late Apr, followed by a slight dip in numbers collected, then followed by another increase from the F1 generation emergence, which aligned with the emergence of adult weevils from the capitula kept in the screen house (Fig.
1901) (expressing concern that statements by experts would likely "influence the jury" to consider inadmissible evidence); Capitula v.
Superficially, Dasypogon and Kingia appear to form a sister pair within Dasypogonaceae because they share a shrubby or tree-like habit and both possess characteristic "drumstick" inflorescences consisting of globular capitula with sessile flowers and persistent bracts (Waterhouse 1967).
2009) studied the yield of 'Mandirituba' chamomile capitula as functions of N addition (3, 18, 30, 42 and 57 kg [ha.
Faustus, the Manichaean bishop, in his Capitula (c.
August Nurnberger studied the manuscript in detail and counted fifty-four capitula and chapter headings in the third element of the manuscript.