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(Last Modified On 6/19/2013)
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(Last Modified On 6/19/2013)
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Genus
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Tagetes L.
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PlaceOfPublication
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Sp. P1. 887. 1753.
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Note
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TYPE: T. patula L.
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Synonym
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Diglossus Cass., Bull. Soc. Philomn. 1817: 70. 1817. TYPE: D. variabilis Cass. Enalcida Cass., Bull. Soc. Philom. 1819: 31. 1819. LECTOTYPE: E. pilifera Cass. Solenotheca Nutt., Trans. Amer. Philos. Soc., n.s. 7: 371. 1841. TYPE: S. tenella Nutt.
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Description
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Annual or perennial herbs, glabrous or pubescent, usually strong-scented; stems slender or stout, leafy, often much branched. Leaves opposite below, opposite or alternate above, simple and entire to deeply pinnatifid, or pinnately compound, the margins entire to serrate, glabrous or pubescent, variously gland- dotted. Inflorescence cymose or the heads solitary; peduncles short to elongate, slender to markedly inflated. Heads radiate or rarely discoid, small to large; involucres cylindric, fusiform or campanulate, the bracts uniseriate, marginally fused nearly to the tips, variously punctate; receptacles flat to convex, naked; ray florets fertile, -few to many, the ligules small to large, white, yellow, or orange, sometimes spotted with brown, the tube slender, the style branches slender; disc florets perfect and fertile, few to many, the corollas yellow or orange, equally or unequally 4-5-lobed, the anthers weakly sagittate basally, the appendages
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Habit
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herbs
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Description
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triangular-acute, the style branches long, slender. Achenes elongate, slender, several-angled, variously pubescent; carpopodium short; pappus of pales and/or scales. Chromosome base numbers x = 11, 12
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Distribution
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Tagetes, a genus of about 40 species, includes several familiar ornamentals, the garden marigolds. In addition to these cultivated species, wild taxa of the genus occur from the southwestern United States to northern Argentina.
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Note
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In Panama, the genus is represented by one cultivated species, T. erecta, the common "French" marigold, and two native species, T. filifolia and T. microglossa. No published revision for the entire genus exists. Rydberg (1915) treated the genus for North America. In preparation of the present treatment, an unpublished source (Neher, 1963), has proven useful.
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Reference
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Neher, R. T. 1963. Monograph of the genus Tagetes (Compositae). Ph.D. thesis, Indiana University. Neher, R. T. 1967. In Documented chromosome numbers of plants. Madrofio 19: 134-136. Towner, J. W. 1961. Cytogenetic studies on the origin of Tagetes patula. Meiosis and morphology of diploid and allotetraploid T. erecta x T. tenuifolia. Amer. Jour. Bot. 48: 743-751.
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Key
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a. Leaf divisions linear-lanceolate, serrate; ray florets yellow. b. Involucres cylindric; rays 3-5 ...... 3. T. microglossa bb. Involucres broadly campanulate; rays 8-many ...... 1. T. erecta aa. Leaf divisions linear, entire; ray florets (when present) white ...... 2. T. filifolia
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Tag
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Project Name
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Tag
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