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(Last Modified On 6/13/2013)
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(Last Modified On 6/13/2013)
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Genus
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Delilia Spreng.
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PlaceOfPublication
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Bull. Sci. Soc. Philom. Paris, ser. 3, 10: 54, tab. 2. 1823.
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Note
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TYPE: D. berteri Spreng. = D. biflora (L.) Kuntze.
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Synonym
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Elvira Cass., Dict. Sci. Nat. 30: 67. 1824. TYPE: Milleria biflora L. Meratia Cass., Dict. Sci. Nat. 30: 65. 1824, nom. superfl., based on type of Delilia Spreng.
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Description
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Annual herbs; stems much-branched. Leaves opposite. Inflorescence of nu- merous or few, terminal or axillary heads, often in fascicles or glomerules. Heads small, radiate; involucre flattened, the bracts 2(-4), slightly herbaceous, with the exterior bract conspicuously larger than the rest; receptacle small, naked; ray florets 1-3, carpellate, fertile, the corollas yellow (to white), the tube and ligule narrow, subentire; disc florets 1-4, perfect, the corollas tubular, 5-lobed, yellow, the throat narrowly campanulate, the anthers 5, entire at the base, the style undivided, hirtellous, the ovary sterile. Achenes obovate, flattened, smooth, glabrous, completely enclosed by the involucral bracts; pappus rudimentary. Chromosome number n = 12.23
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Habit
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herbs
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Distribution
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widely distributed throughout Latin America. The other 2 taxa are restricted to the Galapagos Islands.
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Note
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The name Elvira has been used most often for this genus. The competing name, Delilia, was believed by many workers to have been published by Sprengel in 1826 (Syst. Veg., ed. 16, 3: 367), two years after Cassini's publication (1824) of Elvira. However, in addition to the 1826 description, Sprengel also published the name Delilia three years earlier (1823) in the Bull. Sci. Soc. Philom. Paris.
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