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(Last Modified On 6/14/2013)
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(Last Modified On 6/14/2013)
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Genus
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Zinnia L.
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PlaceOfPublication
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Syst. Nat., ed. 10. 1221. 1759, nom. cons.
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Note
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TYPE: Z. peruviana (L.) L.
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Description
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Annual or perennial herbs or low shrubs; stem angular to terete, green to sometimes purplish, smooth or striate, pubescent. Leaves opposite, the bases connate and sheathing the stem, both surfaces glabrous to pubescent, the margin entire; sessile or petiolate. Inflorescence of solitary heads; peduncles terete, striate to smooth, hollow, pubescent. JIeadq radiate; involucre cylindrical to hemispherical, the bracts multiseriate, oblong to obovate, imbricate, graduated, apically rounded and erose and/or ciliate with a dark band; receptacle slightly concave to narrowly conical; paleas persistent, conduplicate, rounded to acute, the margin erose or fimbriately lobed or entire-cuspidate, hyaline to membra- naceous; ray florets fertile, the ligule usually present, persistent on the mature achene, white, yellow-orange, red, or purple, with or without a short tube, 1-3- lobed, the style bifid, filiform, acuminate; disc florets perfect, fertile, the corollas tubular, 5-lobed, sometimes zygomorphic with one lobe longer, the anthers with acute appendages, basally truncate to free-sagittate, the style bifid with filiform branches, apically acuminate and hairy or penicillately truncate. Ray achenes compressed to 3-angled, smooth, striate, or tuberculate, glabrous or pubescent; disc achenes compressed or angular, awned or awnless or simply bearing horns,
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Habit
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herbs or low shrubs
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Description
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glabrous or pubescent. Chromosome numbers n = 10, 11, 11 + 2B, 12, 13, 19 + 2B, 20, 21, 24, ca. 42.
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Distribution
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Zinnia, sensu stricto, is a genus of 17 species restricted to North America with the exception of Zinnia multiflora which extends into Colombia, Ecuador, Peru, and Argentina
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Note
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Based mainly upon experimental crossing data, Olorode & Torres (1970) recently included the related Mexican genus Tragoceros H.B.K., composed of 5 species, in Zinnia as a separate section.
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Reference
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Olorode, 0. & A. M. Torres. 1970. Artificial hybridization of the genera Zinnia (sect. Mendezia) and Tragoceros (Compositae-Zinninae). Brittonia 22: 359-369. Torres, A. M. 1963. Taxonomy of Zinnia. Brittonia 15: 1-25.
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